fix: standardize CSV export filename format to use project name

Unified export filename format across both ExportCSV and ExportConfigCSV:
- Format: YYYY-MM-DD (project_name) config_name BOM.csv
- Use PriceUpdatedAt if available, otherwise CreatedAt
- Extract project name from ProjectUUID for ExportCSV via projectService
- Pass project_uuid from frontend to backend in export request
- Add projectUUID and projectName state variables to track project context

This ensures consistent naming whether exporting from form or project view,
and uses most recent price update timestamp in filename.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

.githooks/pre-commit

@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+repo_root="$(git rev-parse --show-toplevel)"
+"$repo_root/scripts/check-secrets.sh"

.gitignore

@@ -1,5 +1,16 @@
 # QuoteForge
 config.yaml
+.env
+.env.*
+*.pem
+*.key
+*.p12
+*.pfx
+*.crt
+id_rsa
+id_rsa.*
+secrets.yaml
+secrets.yml
 
 # Local SQLite database (contains encrypted credentials)
 /data/*.db
@@ -13,6 +24,28 @@ config.yaml
 /cron
 /bin/
 
+# Local Go build cache used in sandboxed runs
+.gocache/
+
+# Local tooling state
+.claude/
+
+# Editor settings
+.idea/
+.vscode/
+*.swp
+*.swo
+
+# Temp and logs
+*.tmp
+*.temp
+*.log
+
+# Go test/build artifacts
+*.out
+*.test
+coverage/
+
 # ---> macOS
 # General
 .DS_Store
@@ -41,3 +74,8 @@ Network Trash Folder
 Temporary Items
 .apdisk
 
+# Release artifacts, but DO track releases/memory/ for changelog
+releases/
+!releases/
+!releases/memory/
+!releases/memory/**

CLAUDE.md

@@ -1,150 +1,83 @@
 # QuoteForge - Claude Code Instructions
 
 ## Overview
-Корпоративный конфигуратор серверов и формирование КП. MariaDB (RFQ_LOG) + SQLite для оффлайн.
+Корпоративный конфигуратор серверов с offline-first архитектурой.
+Приложение работает через локальную SQLite базу, синхронизация с MariaDB выполняется фоново.
 
-## Development Phases
+## Product Scope
+- Конфигуратор компонентов и расчёт КП
+- Проекты и конфигурации
+- Read-only просмотр прайслистов из локального кэша
+- Sync (pull компонентов/прайслистов, push локальных изменений)
 
-### Phase 1: Pricelists in MariaDB ✅ DONE
-### Phase 2: Local SQLite Database ✅ DONE
+Из области исключены:
+- admin pricing UI/API
+- stock import
+- alerts
+- cron/importer утилиты
 
-### Phase 2.5: Full Offline Mode 🔶 IN PROGRESS
-**Local-first architecture:** приложение ВСЕГДА работает с SQLite, MariaDB только для синхронизации.
+## Architecture
+- Local-first: чтение и запись происходят в SQLite
+- MariaDB используется как сервер синхронизации
+- Background worker: периодический sync push+pull
 
-**Принцип работы:**
-- ВСЕ операции (CRUD) выполняются в SQLite
-- При создании конфигурации:
-  1. Если online → проверить новые прайслисты на сервере → скачать если есть
-  2. Далее работаем с local_pricelists (и online, и offline одинаково)
-- Background sync: push pending_changes → pull updates
+## Guardrails
+- Не возвращать в проект удалённые legacy-разделы: cron jobs, importer utility, admin pricing, alerts, stock import.
+- Runtime-конфиг читается из user state (`config.yaml`) или через `-config` / `QFS_CONFIG_PATH`; не хранить рабочий `config.yaml` в репозитории.
+- `config.example.yaml` остаётся единственным шаблоном конфигурации в репо.
+- Любые изменения в sync должны сохранять local-first поведение: локальные CRUD не блокируются из-за недоступности MariaDB.
 
-**DONE:**
-- ✅ Sync queue table (pending_changes) - `internal/localdb/models.go`
-- ✅ Model converters: MariaDB ↔ SQLite - `internal/localdb/converters.go`
-- ✅ LocalConfigurationService: все CRUD через SQLite - `internal/services/local_configuration.go`
-- ✅ Pre-create pricelist check: `SyncPricelistsIfNeeded()` - `internal/services/sync/service.go`
-- ✅ Push pending changes: `PushPendingChanges()` - sync service + handlers
-- ✅ Sync API endpoints: `/api/sync/push`, `/pending/count`, `/pending`
-- ✅ Integrate LocalConfigurationService in main.go (replace ConfigurationService)
-- ✅ Add routes for new sync endpoints (`/api/sync/push`, `/pending/count`, `/pending`)
-- ✅ ConfigurationGetter interface for handler compatibility
-- ✅ Background sync worker: auto-sync every 5min (push + pull) - `internal/services/sync/worker.go`
-- ✅ UI: sync status indicator (pending badge + sync button + offline/online dot) - `web/templates/partials/sync_status.html`
-- ✅ RefreshPrices for local mode:
-  - `RefreshPrices()` / `RefreshPricesNoAuth()` в `local_configuration.go`
-  - Берёт цены из `local_components.current_price`
-  - Graceful degradation при отсутствии компонента
-  - Добавлено поле `price_updated_at` в `LocalConfiguration` (models.go:72)
-  - Обновлены converters для PriceUpdatedAt
-  - UI кнопка "Пересчитать цену" работает offline/online
-- ✅ Fixed sync bugs:
-  - Duplicate entry error при update конфигураций (`sync/service.go:334-365`)
-  - pushConfigurationUpdate теперь проверяет наличие server_id перед update
-  - Если нет ID → получает из LocalConfiguration.ServerID или ищет на сервере
-  - Fixed setup.go: `settings.Password` → `settings.PasswordEncrypted`
-
-**TODO:**
-- ❌ Conflict resolution (Phase 4, last-write-wins default)
-
-### UI Improvements ✅ MOSTLY DONE
-
-**1. Sync UI + pricelist badge: ✅ DONE**
-- ✅ `sync_status.html`: SVG иконки Online/Offline (кликабельные → открывают модал)
-- ✅ Кнопка sync → иконка circular arrows (только full sync)
-- ✅ Модальное окно "Статус системы" в `base.html` (info о БД, ошибки синхронизации)
-- ✅ `configs.html`: badge с версией активного прайслиста
-- ✅ Загрузка через `/api/pricelists/latest` при DOMContentLoaded
-- ✅ Удалён dropdown с Push changes (упрощение UI)
-
-**2. Прайслисты → вкладка в "Администратор цен": ✅ DONE**
-- ✅ `base.html`: убрана ссылка "Прайслисты" из навигации
-- ✅ `admin_pricing.html`: добавлена вкладка "Прайслисты"
-- ✅ Логика перенесена из `pricelists.html` (table, create modal, CRUD)
-- ✅ Route `/pricelists` → редирект на `/admin/pricing?tab=pricelists`
-- ✅ Поддержка URL param `?tab=pricelists`
-
-**3. Модал "Настройка цены" - кол-во котировок с учётом периода: ❌ TODO**
-- Текущее: показывает только общее кол-во котировок
-- Новое: показывать `N (всего: M)` где N - за выбранный период, M - всего
-- ❌ `admin_pricing.html`: обновить `#modal-quote-count`
-- ❌ `admin_pricing_handler.go`: в `/api/admin/pricing/preview` возвращать `quote_count_period` + `quote_count_total`
-
-**4. Страница настроек: ❌ ОТЛОЖЕНО**
-- Перенесено в Phase 3 (после основных UI улучшений)
-
-### Phase 3: Projects and Specifications
-- qt_projects, qt_specifications tables (MariaDB)
-- Replace qt_configurations → Project/Specification hierarchy
-- Fields: opty, customer_requirement, variant, qty, rev
-- Local projects/specs with server sync
-
-### Phase 4: Price Versioning
-- Bind specifications to pricelist versions
-- Price diff comparison
-- Auto-cleanup expired pricelists (>1 year, usage_count=0)
-
-## Tech Stack
-Go 1.22+ | Gin | GORM | MariaDB 11 | SQLite (glebarez/sqlite) | htmx + Tailwind CDN | excelize
-
-## Key Tables
-
-### READ-ONLY (external systems)
-- `lot` (lot_name PK, lot_description)
-- `lot_log` (lot, supplier, date, price, quality, comments)
-- `supplier` (supplier_name PK)
-
-### MariaDB (qt_* prefix)
-- `qt_lot_metadata` - component prices, methods, popularity
-- `qt_categories` - category codes and names
-- `qt_pricelists` - version snapshots (YYYY-MM-DD-NNN format)
-- `qt_pricelist_items` - prices per pricelist
-- `qt_projects` - uuid, opty, customer_requirement, name (Phase 3)
-- `qt_specifications` - project_id, pricelist_id, variant, rev, qty, items JSON (Phase 3)
-
-### SQLite (data/quoteforge.db)
-- `connection_settings` - encrypted DB credentials (PasswordEncrypted field)
-- `local_pricelists/items` - cached from server
-- `local_components` - lot cache for offline search (with current_price)
-- `local_configurations` - UUID, items, price_updated_at, sync_status (pending/synced/conflict), server_id
-- `local_projects/specifications` - Phase 3
-- `pending_changes` - sync queue (entity_type, uuid, op, payload, created_at, attempts, last_error)
-
-## Business Logic
-
-**Part number parsing:** `CPU_AMD_9654` → category=`CPU`, model=`AMD_9654`
-
-**Price methods:** manual | median | average | weighted_median
-
-**Price freshness:** fresh (<30d, ≥3 quotes) | normal (<60d) | stale (<90d) | critical
-
-**Pricelist version:** `YYYY-MM-DD-NNN` (e.g., `2024-01-31-001`)
+## Key SQLite Data
+- `connection_settings`
+- `local_components`
+- `local_pricelists`, `local_pricelist_items`
+- `local_configurations`
+- `local_projects`
+- `pending_changes`
 
 ## API Endpoints
-
 | Group | Endpoints |
 |-------|-----------|
-| Setup | GET/POST /setup, POST /setup/test |
-| Components | GET /api/components, /api/categories |
-| Pricelists | CRUD /api/pricelists, GET /latest, POST /compare |
-| Projects | CRUD /api/projects/:uuid (Phase 3) |
-| Specs | CRUD /api/specs/:uuid, POST /upgrade, GET /diff (Phase 3) |
-| Configs | POST /:uuid/refresh-prices (обновить цены из local_components) |
-| Sync | GET /status, POST /components, /pricelists, /push, /pull, /resolve-conflict |
-| Export | GET /api/specs/:uuid/export, /api/projects/:uuid/export |
+| Setup | `GET /setup`, `POST /setup`, `POST /setup/test`, `GET /setup/status` |
+| Components | `GET /api/components`, `GET /api/components/:lot_name`, `GET /api/categories` |
+| Quote | `POST /api/quote/validate`, `POST /api/quote/calculate`, `POST /api/quote/price-levels` |
+| Pricelists (read-only) | `GET /api/pricelists`, `GET /api/pricelists/latest`, `GET /api/pricelists/:id`, `GET /api/pricelists/:id/items`, `GET /api/pricelists/:id/lots` |
+| Configs | CRUD + refresh/clone/reactivate/rename/project binding via `/api/configs/*` |
+| Projects | CRUD + nested configs via `/api/projects/*` |
+| Sync | `GET /api/sync/status`, `GET /api/sync/readiness`, `GET /api/sync/info`, `GET /api/sync/users-status`, `POST /api/sync/components`, `POST /api/sync/pricelists`, `POST /api/sync/all`, `POST /api/sync/push`, `GET /api/sync/pending`, `GET /api/sync/pending/count` |
+| Export | `POST /api/export/csv` |
+
+## Web Routes
+- `/configs`
+- `/configurator`
+- `/projects`
+- `/projects/:uuid`
+- `/pricelists`
+- `/pricelists/:id`
+- `/setup`
+
+## Release Notes & Change Log
+Release notes are maintained in `releases/memory/` directory organized by version tags (e.g., `v1.2.1.md`).
+Before working on the codebase, review the most recent release notes to understand recent changes.
+- Check `releases/memory/` for detailed changelog between tags
+- Each release file documents commits, breaking changes, and migration notes
 
 ## Commands
 ```bash
-go run ./cmd/server          # Dev server
-go run ./cmd/cron -job=X     # cleanup-pricelists | update-prices | update-popularity
-CGO_ENABLED=0 go build -ldflags="-s -w" -o bin/quoteforge ./cmd/server
+# Development
+go run ./cmd/qfs
+make run
+
+# Build
+make build-release
+CGO_ENABLED=0 go build -o bin/qfs ./cmd/qfs
+
+# Verification
+go build ./cmd/qfs
+go vet ./...
 ```
 
 ## Code Style
-- gofmt, structured logging (slog), wrap errors with context
-- snake_case files, PascalCase types
-- RBAC disabled: DB username = user_id via `models.EnsureDBUser()`
-
-## UI Guidelines
-- htmx (hx-get/post/target/swap), Tailwind CDN
-- Freshness colors: green (fresh) → yellow → orange → red (critical)
-- Sync status + offline indicator in header
+- gofmt
+- structured logging (`slog`)
+- explicit error wrapping with context

LOCAL_FIRST_INTEGRATION.md

@@ -1,178 +0,0 @@
-# Local-First Architecture Integration Guide
-
-## Overview
-
-QuoteForge теперь поддерживает local-first архитектуру: приложение ВСЕГДА работает с SQLite (localdb), MariaDB используется только для синхронизации.
-
-## Реализованные компоненты
-
-### 1. Конвертеры моделей (`internal/localdb/converters.go`)
-
-Конвертеры между MariaDB и SQLite моделями:
-- `ConfigurationToLocal()` / `LocalToConfiguration()`
-- `PricelistToLocal()` / `LocalToPricelist()`
-- `ComponentToLocal()` / `LocalToComponent()`
-
-### 2. LocalDB методы (`internal/localdb/localdb.go`)
-
-Добавлены методы для работы с pending changes:
-- `MarkChangesSynced(ids []int64)` - помечает изменения как синхронизированные
-- `GetPendingCount()` - возвращает количество несинхронизированных изменений
-
-### 3. Sync Service расширения (`internal/services/sync/service.go`)
-
-Новые методы:
-- `SyncPricelistsIfNeeded()` - проверяет и скачивает новые прайслисты при необходимости
-- `PushPendingChanges()` - отправляет все pending changes на сервер
-- `pushSingleChange()` - обрабатывает один pending change
-- `pushConfigurationCreate/Update/Delete()` - специфичные методы для конфигураций
-
-**ВАЖНО**: Конструктор изменен - теперь требует `ConfigurationRepository`:
-```go
-syncService := sync.NewService(pricelistRepo, configRepo, local)
-```
-
-### 4. LocalConfigurationService (`internal/services/local_configuration.go`)
-
-Новый сервис для работы с конфигурациями в local-first режиме:
-- Все операции CRUD работают через SQLite
-- Автоматически добавляет изменения в pending_changes
-- При создании конфигурации (если online) проверяет новые прайслисты
-
-```go
-localConfigService := services.NewLocalConfigurationService(
-    localDB,
-    syncService,
-    quoteService,
-    isOnlineFunc,
-)
-```
-
-### 5. Sync Handler расширения (`internal/handlers/sync.go`)
-
-Новые endpoints:
-- `POST /api/sync/push` - отправить pending changes на сервер
-- `GET /api/sync/pending/count` - получить количество pending changes
-- `GET /api/sync/pending` - получить список pending changes
-
-## Интеграция
-
-### Шаг 1: Обновить main.go
-
-```go
-// В cmd/server/main.go
-syncService := sync.NewService(pricelistRepo, configRepo, local)
-
-// Создать isOnline функцию
-isOnlineFunc := func() bool {
-    sqlDB, err := db.DB()
-    if err != nil {
-        return false
-    }
-    return sqlDB.Ping() == nil
-}
-
-// Создать LocalConfigurationService
-localConfigService := services.NewLocalConfigurationService(
-    local,
-    syncService,
-    quoteService,
-    isOnlineFunc,
-)
-```
-
-### Шаг 2: Обновить ConfigurationHandler
-
-Заменить `ConfigurationService` на `LocalConfigurationService` в handlers:
-
-```go
-// Было:
-configHandler := handlers.NewConfigurationHandler(configService, exportService)
-
-// Стало:
-configHandler := handlers.NewConfigurationHandler(localConfigService, exportService)
-```
-
-### Шаг 3: Добавить endpoints для sync
-
-В роутере добавить:
-```go
-syncGroup := router.Group("/api/sync")
-{
-    syncGroup.POST("/push", syncHandler.PushPendingChanges)
-    syncGroup.GET("/pending/count", syncHandler.GetPendingCount)
-    syncGroup.GET("/pending", syncHandler.GetPendingChanges)
-}
-```
-
-## Как это работает
-
-### Создание конфигурации
-
-1. Пользователь создает конфигурацию
-2. `LocalConfigurationService.Create()`:
-   - Если online → `SyncPricelistsIfNeeded()` проверяет новые прайслисты
-   - Сохраняет конфигурацию в SQLite
-   - Добавляет в `pending_changes` с operation="create"
-3. Конфигурация доступна локально сразу
-
-### Синхронизация с сервером
-
-**Manual sync:**
-```bash
-POST /api/sync/push
-```
-
-**Background sync (TODO):**
-- Периодический worker вызывает `syncService.PushPendingChanges()`
-- Проверяет online статус
-- Отправляет все pending changes на сервер
-- Удаляет успешно синхронизированные записи
-
-### Offline режим
-
-1. Все операции работают нормально через SQLite
-2. Изменения копятся в `pending_changes`
-3. При восстановлении соединения автоматически синхронизируются
-
-## Pending Changes Queue
-
-Таблица `pending_changes`:
-```go
-type PendingChange struct {
-    ID         int64     // Auto-increment
-    EntityType string    // "configuration", "project", "specification"
-    EntityUUID string    // UUID сущности
-    Operation  string    // "create", "update", "delete"
-    Payload    string    // JSON snapshot сущности
-    CreatedAt  time.Time
-    Attempts   int       // Счетчик попыток синхронизации
-    LastError  string    // Последняя ошибка синхронизации
-}
-```
-
-## TODO для Phase 2.5
-
-- [ ] Background sync worker (автоматическая синхронизация каждые N минут)
-- [ ] Conflict resolution (при конфликтах обновления)
-- [ ] UI: pending counter в header
-- [ ] UI: manual sync button
-- [ ] UI: conflict alerts
-- [ ] Retry logic для failed pending changes
-- [ ] RefreshPrices для local mode (через local_components)
-
-## Testing
-
-```bash
-# Compile
-go build ./cmd/server
-
-# Run
-./quoteforge
-
-# Check pending changes
-curl http://localhost:8080/api/sync/pending/count
-
-# Manual sync
-curl -X POST http://localhost:8080/api/sync/push
-```

MIGRATION_PRICE_REFRESH.md

@@ -1,121 +0,0 @@
-# Миграция: Функционал пересчета цен в конфигураторе
-
-## Описание изменений
-
-Добавлен функционал автоматического обновления цен компонентов в сохраненных конфигурациях.
-
-### Новые возможности
-
-1. **Кнопка "Пересчитать цену"** на странице конфигуратора
-   - Обновляет цены всех компонентов в конфигурации до актуальных значений из базы данных
-   - Сохраняет количество компонентов, обновляя только цены
-   - Отображает время последнего обновления цен
-
-2. **Поле `price_updated_at`** в таблице конфигураций
-   - Хранит дату и время последнего обновления цен
-   - Отображается на странице конфигуратора в удобном формате ("5 мин. назад", "2 ч. назад" и т.д.)
-
-### Изменения в базе данных
-
-Добавлено новое поле в таблицу `qt_configurations`:
-```sql
-ALTER TABLE qt_configurations
-ADD COLUMN price_updated_at TIMESTAMP NULL DEFAULT NULL
-AFTER server_count;
-```
-
-### Новый API endpoint
-
-```
-POST /api/configs/:uuid/refresh-prices
-```
-
-**Требования:**
-- Авторизация: Bearer Token
-- Роль: editor или выше
-
-**Ответ:**
-```json
-{
-  "id": 1,
-  "uuid": "...",
-  "name": "Конфигурация 1",
-  "items": [
-    {
-      "lot_name": "CPU_AMD_9654",
-      "quantity": 2,
-      "unit_price": 11500.00
-    }
-  ],
-  "total_price": 23000.00,
-  "price_updated_at": "2026-01-31T12:34:56Z",
-  ...
-}
-```
-
-## Применение изменений
-
-### 1. Обновление базы данных
-
-Запустите сервер с флагом миграции:
-```bash
-./quoteforge -migrate -config config.yaml
-```
-
-Или выполните SQL миграцию вручную:
-```bash
-mysql -u user -p RFQ_LOG < migrations/004_add_price_updated_at.sql
-```
-
-### 2. Перезапуск сервера
-
-После применения миграции перезапустите сервер:
-```bash
-./quoteforge -config config.yaml
-```
-
-## Использование
-
-1. Откройте любую сохраненную конфигурацию в конфигураторе
-2. Нажмите кнопку **"Пересчитать цену"** рядом с кнопкой "Сохранить"
-3. Все цены компонентов будут обновлены до актуальных значений
-4. Конфигурация автоматически сохраняется с обновленными ценами
-5. Под кнопками отображается время последнего обновления цен
-
-## Технические детали
-
-### Измененные файлы
-
-- `internal/models/configuration.go` - добавлено поле `PriceUpdatedAt`
-- `internal/services/configuration.go` - добавлен метод `RefreshPrices()`
-- `internal/handlers/configuration.go` - добавлен обработчик `RefreshPrices()`
-- `cmd/server/main.go` - добавлен маршрут `/api/configs/:uuid/refresh-prices`
-- `web/templates/index.html` - добавлена кнопка и JavaScript функции
-- `migrations/004_add_price_updated_at.sql` - SQL миграция
-- `CLAUDE.md` - обновлена документация
-
-### Логика обновления цен
-
-1. Получение конфигурации по UUID
-2. Проверка прав доступа (пользователь должен быть владельцем)
-3. Для каждого компонента в конфигурации:
-   - Получение актуальной цены из `qt_lot_metadata.current_price`
-   - Обновление `unit_price` в items
-4. Пересчет `total_price` с учетом `server_count`
-5. Установка `price_updated_at` на текущее время
-6. Сохранение конфигурации
-
-### Обработка ошибок
-
-- Если компонент не найден или у него нет цены - сохраняется старая цена
-- При ошибках доступа возвращается 403 Forbidden
-- При отсутствии конфигурации возвращается 404 Not Found
-
-## Отмена изменений (Rollback)
-
-Для отмены миграции выполните:
-```sql
-ALTER TABLE qt_configurations DROP COLUMN price_updated_at;
-```
-
-**Внимание:** После отмены миграции функционал пересчета цен перестанет работать корректно.

Makefile

@@ -0,0 +1,104 @@
+.PHONY: build build-release clean test run version install-hooks
+
+# Get version from git
+VERSION := $(shell git describe --tags --always --dirty 2>/dev/null || echo "dev")
+BUILD_TIME := $(shell date -u '+%Y-%m-%d_%H:%M:%S')
+LDFLAGS := -s -w -X main.Version=$(VERSION)
+
+# Binary name
+BINARY := qfs
+
+# Build for development (with debug info)
+build:
+	go build -o bin/$(BINARY) ./cmd/qfs
+
+# Build for release (optimized, with version)
+build-release:
+	@echo "Building $(BINARY) version $(VERSION)..."
+	CGO_ENABLED=0 go build -ldflags="$(LDFLAGS)" -o bin/$(BINARY) ./cmd/qfs
+	@echo "✓ Built: bin/$(BINARY)"
+	@./bin/$(BINARY) -version
+
+# Build release for Linux (cross-compile)
+build-linux:
+	@echo "Building $(BINARY) for Linux..."
+	CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags="$(LDFLAGS)" -o bin/$(BINARY)-linux-amd64 ./cmd/qfs
+	@echo "✓ Built: bin/$(BINARY)-linux-amd64"
+
+# Build release for macOS (cross-compile)
+build-macos:
+	@echo "Building $(BINARY) for macOS..."
+	CGO_ENABLED=0 GOOS=darwin GOARCH=amd64 go build -ldflags="$(LDFLAGS)" -o bin/$(BINARY)-darwin-amd64 ./cmd/qfs
+	CGO_ENABLED=0 GOOS=darwin GOARCH=arm64 go build -ldflags="$(LDFLAGS)" -o bin/$(BINARY)-darwin-arm64 ./cmd/qfs
+	@echo "✓ Built: bin/$(BINARY)-darwin-amd64"
+	@echo "✓ Built: bin/$(BINARY)-darwin-arm64"
+
+# Build release for Windows (cross-compile)
+build-windows:
+	@echo "Building $(BINARY) for Windows..."
+	CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build -ldflags="$(LDFLAGS)" -o bin/$(BINARY)-windows-amd64.exe ./cmd/qfs
+	@echo "✓ Built: bin/$(BINARY)-windows-amd64.exe"
+
+# Build all platforms
+build-all: build-release build-linux build-macos build-windows
+
+# Create release packages for all platforms
+release:
+	@./scripts/release.sh
+
+# Show version
+version:
+	@echo "Version: $(VERSION)"
+
+# Clean build artifacts
+clean:
+	rm -rf bin/
+	rm -f $(BINARY)
+
+# Run tests
+test:
+	go test -v ./...
+
+# Run development server
+run:
+	go run ./cmd/qfs
+
+# Run with auto-restart (requires entr: brew install entr)
+watch:
+	find . -name '*.go' | entr -r go run ./cmd/qfs
+
+# Install dependencies
+deps:
+	go mod download
+	go mod tidy
+
+# Install local git hooks
+install-hooks:
+	git config core.hooksPath .githooks
+	chmod +x .githooks/pre-commit scripts/check-secrets.sh
+	@echo "Installed git hooks from .githooks/"
+
+# Help
+help:
+	@echo "QuoteForge Server (qfs) - Build Commands"
+	@echo ""
+	@echo "Usage: make [target]"
+	@echo ""
+	@echo "Targets:"
+	@echo "  build          Build for development (with debug info)"
+	@echo "  build-release  Build optimized release (default)"
+	@echo "  build-linux    Cross-compile for Linux"
+	@echo "  build-macos    Cross-compile for macOS (Intel + Apple Silicon)"
+	@echo "  build-windows  Cross-compile for Windows"
+	@echo "  build-all      Build for all platforms"
+	@echo "  release        Create release packages for all platforms"
+	@echo "  version        Show current version"
+	@echo "  clean          Remove build artifacts"
+	@echo "  test           Run tests"
+	@echo "  run            Run development server"
+	@echo "  watch          Run with auto-restart (requires entr)"
+	@echo "  deps           Install/update dependencies"
+	@echo "  install-hooks  Install local git hooks (secret scan on commit)"
+	@echo "  help           Show this help"
+	@echo ""
+	@echo "Current version: $(VERSION)"

README.md

@@ -2,7 +2,8 @@
 
 **Server Configuration & Quotation Tool**
 
-QuoteForge — корпоративный инструмент для конфигурирования серверов и формирования коммерческих предложений (КП). Приложение интегрируется с существующей базой данных RFQ_LOG.
+QuoteForge — корпоративный инструмент для конфигурирования серверов и формирования коммерческих предложений (КП).  
+Приложение работает в strict local-first режиме: пользовательские операции выполняются через локальную SQLite, MariaDB используется для синхронизации и серверного администрирования прайслистов.
 
 ![Go Version](https://img.shields.io/badge/Go-1.22+-00ADD8?style=flat&logo=go)
 ![License](https://img.shields.io/badge/License-Proprietary-red)
@@ -16,6 +17,8 @@ QuoteForge — корпоративный инструмент для конфи
 - 💰 **Автоматический расчёт цен** — актуальные цены на основе истории закупок
 - 📊 **Экспорт в CSV/XLSX** — готовые спецификации для клиентов
 - 💾 **Сохранение конфигураций** — история и шаблоны для повторного использования
+- 🔌 **Полная офлайн-работа** — можно продолжать работу без сети и синхронизировать позже
+- 🛡️ **Защищенная синхронизация** — sync блокируется preflight-проверкой, если локальная схема не готова
 
 ### Для ценовых администраторов
 - 📈 **Умный расчёт цен** — медиана, взвешенная медиана, среднее
@@ -35,7 +38,7 @@ QuoteForge — корпоративный инструмент для конфи
 
 - **Backend:** Go 1.22+, Gin, GORM
 - **Frontend:** HTML, Tailwind CSS, htmx
-- **Database:** MariaDB 11+
+- **Database:** SQLite (runtime/local-first), MariaDB 11+ (sync + server admin)
 - **Export:** excelize (XLSX), encoding/csv
 
 ## Требования
@@ -53,13 +56,13 @@ git clone https://github.com/your-company/quoteforge.git
 cd quoteforge
 ```
 
-### 2. Настройка конфигурации
+### 2. Настройка runtime-конфига (опционально)
 
-```bash
-cp config.example.yaml config.yaml
-```
+`config.yaml` создаётся автоматически при первом старте в той же user-state папке, где находится `qfs.db`.
+Если найден старый формат, приложение автоматически мигрирует файл в актуальный runtime-формат
+(оставляя только используемые секции `server` и `logging`).
 
-Отредактируйте `config.yaml`:
+При необходимости можно создать/отредактировать файл вручную:
 
 ```yaml
 server:
@@ -67,24 +70,121 @@ server:
   port: 8080
   mode: "release"
 
-database:
-  host: "localhost"
-  port: 3306
-  name: "RFQ_LOG"
-  user: "quoteforge"
-  password: "your-secure-password"
-
-auth:
-  jwt_secret: "your-jwt-secret-min-32-chars"
-  token_expiry: "24h"
+logging:
+  level: "info"
+  format: "json"
+  output: "stdout"
 ```
 
 ### 3. Миграции базы данных
 
 ```bash
-go run ./cmd/server -migrate
+go run ./cmd/qfs -migrate
 ```
 
+### Мигратор OPS -> проекты (preview/apply)
+
+Переносит квоты, чьи названия начинаются с `OPS-xxxx` (где `x` — цифра), в проект `OPS-xxxx`.
+Если проекта нет, он будет создан; если архивный — реактивирован.
+
+Сначала всегда смотрите preview:
+
+```bash
+go run ./cmd/migrate_ops_projects
+```
+
+Применение изменений:
+
+```bash
+go run ./cmd/migrate_ops_projects -apply
+```
+
+Без интерактивного подтверждения:
+
+```bash
+go run ./cmd/migrate_ops_projects -apply -yes
+```
+
+### Права БД для пользователя приложения
+
+#### Полный набор прав для обычного пользователя
+
+Чтобы выдать существующему пользователю все необходимые права (без переоздания):
+
+```sql
+-- Справочные таблицы (только чтение)
+GRANT SELECT ON RFQ_LOG.lot TO '<DB_USER>'@'%';
+GRANT SELECT ON RFQ_LOG.qt_lot_metadata TO '<DB_USER>'@'%';
+GRANT SELECT ON RFQ_LOG.qt_categories TO '<DB_USER>'@'%';
+GRANT SELECT ON RFQ_LOG.qt_pricelists TO '<DB_USER>'@'%';
+GRANT SELECT ON RFQ_LOG.qt_pricelist_items TO '<DB_USER>'@'%';
+
+-- Таблицы конфигураций и проектов (чтение и запись)
+GRANT SELECT, INSERT, UPDATE ON RFQ_LOG.qt_configurations TO '<DB_USER>'@'%';
+GRANT SELECT, INSERT, UPDATE ON RFQ_LOG.qt_projects TO '<DB_USER>'@'%';
+
+-- Таблицы синхронизации (только чтение для миграций, чтение+запись для статуса)
+GRANT SELECT ON RFQ_LOG.qt_client_local_migrations TO '<DB_USER>'@'%';
+GRANT SELECT, INSERT, UPDATE ON RFQ_LOG.qt_client_schema_state TO '<DB_USER>'@'%';
+GRANT SELECT, INSERT, UPDATE ON RFQ_LOG.qt_pricelist_sync_status TO '<DB_USER>'@'%';
+
+-- Применить изменения
+FLUSH PRIVILEGES;
+
+-- Проверка выданных прав
+SHOW GRANTS FOR '<DB_USER>'@'%';
+```
+
+#### Таблицы и их назначение
+
+| Таблица | Назначение | Права | Примечание |
+|---------|-----------|-------|-----------|
+| `lot` | Справочник компонентов | SELECT | Существующая таблица |
+| `qt_lot_metadata` | Расширенные данные компонентов | SELECT | Метаданные компонентов |
+| `qt_categories` | Категории компонентов | SELECT | Справочник |
+| `qt_pricelists` | Прайслисты | SELECT | Управляется сервером |
+| `qt_pricelist_items` | Позиции прайслистов | SELECT | Управляется сервером |
+| `qt_configurations` | Сохранённые конфигурации | SELECT, INSERT, UPDATE | Основная таблица работы |
+| `qt_projects` | Проекты | SELECT, INSERT, UPDATE | Для группировки конфигураций |
+| `qt_client_local_migrations` | Справочник миграций БД | SELECT | Только чтение (управляется админом) |
+| `qt_client_schema_state` | Состояние локальной схемы | SELECT, INSERT, UPDATE | Отслеживание примененных миграций |
+| `qt_pricelist_sync_status` | Статус синхронизации | SELECT, INSERT, UPDATE | Отслеживание активности синхронизации |
+
+#### При создании нового пользователя
+
+Если нужно создать нового пользователя с нуля:
+
+```sql
+-- 1) Создать пользователя
+CREATE USER IF NOT EXISTS 'quote_user'@'%' IDENTIFIED BY '<DB_PASSWORD>';
+
+-- 2) Выдать все необходимые права
+GRANT SELECT ON RFQ_LOG.lot TO 'quote_user'@'%';
+GRANT SELECT ON RFQ_LOG.qt_lot_metadata TO 'quote_user'@'%';
+GRANT SELECT ON RFQ_LOG.qt_categories TO 'quote_user'@'%';
+GRANT SELECT ON RFQ_LOG.qt_pricelists TO 'quote_user'@'%';
+GRANT SELECT ON RFQ_LOG.qt_pricelist_items TO 'quote_user'@'%';
+GRANT SELECT, INSERT, UPDATE ON RFQ_LOG.qt_configurations TO 'quote_user'@'%';
+GRANT SELECT, INSERT, UPDATE ON RFQ_LOG.qt_projects TO 'quote_user'@'%';
+GRANT SELECT ON RFQ_LOG.qt_client_local_migrations TO 'quote_user'@'%';
+GRANT SELECT, INSERT, UPDATE ON RFQ_LOG.qt_client_schema_state TO 'quote_user'@'%';
+GRANT SELECT, INSERT, UPDATE ON RFQ_LOG.qt_pricelist_sync_status TO 'quote_user'@'%';
+
+-- 3) Применить изменения
+FLUSH PRIVILEGES;
+
+-- 4) Проверить права
+SHOW GRANTS FOR 'quote_user'@'%';
+```
+
+#### Важные замечания
+
+- **Таблицы синхронизации** должны быть созданы администратором БД один раз. Приложение не требует прав CREATE TABLE.
+- **Прайслисты** (`qt_pricelists`, `qt_pricelist_items`) — справочные таблицы, управляются сервером, пользователь имеет только SELECT.
+- **Конфигурации и проекты** — таблицы, в которые пишет само приложение (INSERT, UPDATE при сохранении изменений).
+- **Таблицы миграций** нужны для синхронизации: приложение читает список миграций и отчитывается о применённых.
+- Если видите ошибку `Access denied for user ...@'<ip>'`, проверьте наличие конфликтующих записей пользователя с разными хостами (user@localhost vs user@'%').
+
 ### 4. Импорт метаданных компонентов
 
 ```bash
@@ -95,15 +195,129 @@ go run ./cmd/importer
 
 ```bash
 # Development
-go run ./cmd/server
+go run ./cmd/qfs
 
-# Production
-CGO_ENABLED=0 go build -ldflags="-s -w" -o bin/quoteforge ./cmd/server
-./bin/quoteforge
+# Production (with Makefile - recommended)
+make build-release    # Builds with version info
+./bin/qfs -version    # Check version
+
+# Production (manual)
+VERSION=$(git describe --tags --always --dirty)
+CGO_ENABLED=0 go build -ldflags="-s -w -X main.Version=$VERSION" -o bin/qfs ./cmd/qfs
+./bin/qfs -version
+```
+
+**Makefile команды:**
+```bash
+make build-release   # Оптимизированная сборка с версией
+make build-all       # Сборка для всех платформ (Linux, macOS, Windows)
+make build-windows   # Только для Windows
+make run             # Запуск dev сервера
+make test            # Запуск тестов
+make install-hooks   # Установить git hooks (блокировка коммита с секретами)
+make clean           # Очистка bin/
+make help            # Показать все команды
 ```
 
 Приложение будет доступно по адресу: http://localhost:8080
 
+### Локальная SQLite база (state)
+
+Локальная база приложения хранится в профиле пользователя и не зависит от расположения бинарника.
+Имя файла: `qfs.db`.
+
+- macOS: `~/Library/Application Support/QuoteForge/qfs.db`
+- Linux: `$XDG_STATE_HOME/quoteforge/qfs.db` (или `~/.local/state/quoteforge/qfs.db`)
+- Windows: `%LOCALAPPDATA%\\QuoteForge\\qfs.db`
+
+Можно переопределить путь через `-localdb` или переменную окружения `QFS_DB_PATH`.
+
+#### Sync readiness guard
+
+Перед `push/pull` выполняется preflight-проверка:
+- доступен ли сервер (MariaDB);
+- можно ли проверить и применить централизованные миграции локальной БД;
+- подходит ли версия приложения под `min_app_version` миграций.
+
+Если проверка не пройдена:
+- локальная работа (CRUD) продолжается;
+- sync API возвращает `423 Locked` с `reason_code` и `reason_text`;
+- в UI показывается красный индикатор и причина блокировки в модалке синхронизации.
+
+#### Схема потоков данных синхронизации
+
+```text
+                          [ SERVER / MariaDB ]
+                     ┌───────────────────────────┐
+                     │ qt_projects               │
+                     │ qt_configurations         │
+                     │ qt_pricelists             │
+                     │ qt_pricelist_items        │
+                     │ qt_pricelist_sync_status  │
+                     └─────────────┬─────────────┘
+                                   │
+                    pull (projects/configs/pricelists)
+                                   │
+                ┌──────────────────┴──────────────────┐
+                │                                     │
+      [ CLIENT A / local SQLite ]           [ CLIENT B / local SQLite ]
+   ┌───────────────────────────────┐       ┌───────────────────────────────┐
+   │ local_projects                │       │ local_projects                │
+   │ local_configurations          │       │ local_configurations          │
+   │ local_pricelists              │       │ local_pricelists              │
+   │ local_pricelist_items         │       │ local_pricelist_items         │
+   │ pending_changes (proj/config) │       │ pending_changes (proj/config) │
+   └───────────────┬───────────────┘       └───────────────┬───────────────┘
+                   │                                       │
+      push (projects/configurations only)     push (projects/configurations only)
+                   │                                       │
+                   └──────────────────┬────────────────────┘
+                                      │
+                              [ SERVER / MariaDB ]
+```
+
+По сущностям:
+- Конфигурации: `Client <-> Server <-> Other Clients`
+- Проекты: `Client <-> Server <-> Other Clients`
+- Прайслисты: `Server -> Clients only` (локальный push отсутствует)
+- Локальная очистка прайслистов на клиенте: удаляются записи, которых нет на сервере и которые не используются активными локальными конфигурациями
+
+### Версионность конфигураций (local-first)
+
+Для `local_configurations` используется append-only versioning через полные snapshot-версии:
+
+- таблица: `local_configuration_versions`
+- для каждого изменения создаётся новая версия (`version_no = max + 1`)
+- `local_configurations.current_version_id` указывает на активную версию
+- старые версии не изменяются и не удаляются в обычном потоке
+- rollback не "перематывает" историю, а создаёт новую версию из выбранного snapshot
+
+При backfill (миграция `006_add_local_configuration_versions.sql`) для существующих конфигураций создаётся `v1` и проставляется `current_version_id`.
+
+#### Rollback
+
+Rollback выполняется API-методом:
+
+```bash
+POST /api/configs/:uuid/rollback
+{
+  "target_version": 3,
+  "note": "optional"
+}
+```
+
+Результат:
+- создаётся новая версия `vN` с `data` из целевой версии
+- `change_note = "rollback to v{target_version}"` (+ note, если передан)
+- `current_version_id` переключается на новую версию
+- конфигурация уходит в `sync_status = pending`
+
+### Локальный config.yaml
+
+По умолчанию `qfs` ищет `config.yaml` в той же user-state папке, где лежит `qfs.db` (а не рядом с бинарником).
+Если файла нет, он создаётся автоматически. Если формат устарел, он автоматически мигрируется в runtime-формат (`server` + `logging`).
+Можно переопределить путь через `-config` или `QFS_CONFIG_PATH`.
+
 ## Docker
 
 ```bash
@@ -132,12 +346,23 @@ quoteforge/
 │   ├── templates/       # HTML шаблоны
 │   └── static/          # CSS, JS, изображения
 ├── migrations/          # SQL миграции
-├── config.yaml          # Конфигурация
-├── Dockerfile
-├── docker-compose.yml
+├── config.example.yaml  # Пример конфигурации
+├── releases/
+│   └── memory/         # Changelog между тегами (v1.2.1.md, v1.2.2.md, ...)
 └── go.mod
 ```
 
+## Releases & Changelog
+
+Change log между версиями хранится в `releases/memory/` каталоге в файлах вида `v{major}.{minor}.{patch}.md`.
+
+Каждый файл содержит:
+- Список коммитов между версиями
+- Описание изменений и их влияния
+- Breaking changes и заметки о миграции
+
+**Перед работой над кодом проверьте последний файл в этой папке, чтобы понять текущее состояние проекта.**
+
 ## Роли пользователей
 
 | Роль | Описание |
@@ -159,63 +384,52 @@ GET  /api/components          # Список компонентов
 POST /api/quote/calculate     # Расчёт цены
 POST /api/export/xlsx         # Экспорт в Excel
 GET  /api/configs             # Сохранённые конфигурации
+GET  /api/configs/:uuid/versions            # Список версий конфигурации
+GET  /api/configs/:uuid/versions/:version   # Получить конкретную версию
+POST /api/configs/:uuid/rollback            # Rollback на указанную версию
+POST /api/configs/:uuid/reactivate          # Вернуть архивную конфигурацию в активные
+GET  /api/sync/readiness                   # Статус readiness guard (ready|blocked|unknown)
+GET  /api/sync/status                      # Сводный статус синхронизации
+GET  /api/sync/info                        # Данные для модалки синхронизации
+POST /api/sync/push                        # Push pending changes (423, если blocked)
+POST /api/sync/all                         # Full sync push+pull (423, если blocked)
+POST /api/sync/components                  # Pull components (423, если blocked)
+POST /api/sync/pricelists                  # Pull pricelists (423, если blocked)
 ```
 
-## Cron Jobs
+### Краткая карта sync API
 
-QuoteForge now includes automated cron jobs for maintenance tasks. These can be run using the built-in cron functionality in the Docker container.
+| Endpoint | Назначение | Поток |
+|----------|------------|-------|
+| `POST /api/sync/push` | Отправить локальные pending-изменения | `SQLite -> MariaDB` |
+| `POST /api/sync/components` | Подтянуть справочник компонентов | `MariaDB -> SQLite` |
+| `POST /api/sync/pricelists` | Подтянуть прайслисты и позиции | `MariaDB -> SQLite` |
+| `POST /api/sync/all` | Полный цикл: push + pull + импорт проектов/конфигураций | `двунаправленно` |
+| `GET /api/sync/readiness` | Статус preflight/readiness | `read-only` |
+| `GET /api/sync/status` / `GET /api/sync/info` | Сводка статуса и данных синхронизации | `read-only` |
 
-### Docker Compose Setup
+#### Sync payload для versioning
 
-The Docker setup includes a dedicated cron service that runs the following jobs:
+События в `pending_changes` для конфигураций содержат:
+- `configuration_uuid`
+- `operation` (`create` / `update` / `rollback`)
+- `current_version_id` и `current_version_no`
+- `snapshot` (текущее состояние конфигурации)
+- `idempotency_key` и `conflict_policy` (`last_write_wins`)
 
-- **Alerts check**: Every hour (0 * * * *)
-- **Price updates**: Daily at 2 AM (0 2 * * *)
-- **Usage counter reset**: Weekly on Sunday at 1 AM (0 1 * * 0)
-- **Popularity score updates**: Daily at 3 AM (0 3 * * *)
-
-To enable cron jobs in Docker, run:
-
-```bash
-docker-compose up -d
-```
-
-### Manual Cron Job Execution
-
-You can also run cron jobs manually using the quoteforge-cron binary:
-
-```bash
-# Check and generate alerts
-go run ./cmd/cron -job=alerts
-
-# Recalculate all prices
-go run ./cmd/cron -job=update-prices
-
-# Reset usage counters
-go run ./cmd/cron -job=reset-counters
-
-# Update popularity scores
-go run ./cmd/cron -job=update-popularity
-```
-
-### Cron Job Details
-
-- **Alerts check**: Generates alerts for components with high demand and stale prices, trending components without prices, and components with no recent quotes
-- **Price updates**: Recalculates prices for all components using configured methods (median, weighted median, average)
-- **Usage counter reset**: Resets weekly and monthly usage counters for components
-- **Popularity score updates**: Recalculates popularity scores based on supplier quote activity
+Это позволяет push-слою отправлять на сервер актуальное состояние и готовит основу для будущего conflict resolution.
 
 ## Разработка
 
 ```bash
 # Запуск в режиме разработки (hot reload)
-go run ./cmd/server
+go run ./cmd/qfs
 
 # Запуск тестов
 go test ./...
 
 # Сборка для Linux
-CGO_ENABLED=0 go build -ldflags="-s -w" -o bin/quoteforge ./cmd/server
+CGO_ENABLED=0 go build -ldflags="-s -w" -o bin/qfs ./cmd/qfs
 ```
 
 ## Переменные окружения
@@ -229,6 +443,9 @@ CGO_ENABLED=0 go build -ldflags="-s -w" -o bin/quoteforge ./cmd/server
 | `QF_DB_PASSWORD` | Пароль БД | — |
 | `QF_JWT_SECRET` | Секрет для JWT | — |
 | `QF_SERVER_PORT` | Порт сервера | 8080 |
+| `QFS_DB_PATH` | Полный путь к локальной SQLite БД | OS-specific user state dir |
+| `QFS_STATE_DIR` | Каталог state (если `QFS_DB_PATH` не задан) | OS-specific user state dir |
+| `QFS_CONFIG_PATH` | Полный путь к `config.yaml` | OS-specific user state dir |
 
 ## Интеграция с существующей БД
 

cmd/cron/main.go

@@ -1,84 +0,0 @@
-package main
-
-import (
-	"flag"
-	"log"
-
-	"git.mchus.pro/mchus/quoteforge/internal/config"
-	"git.mchus.pro/mchus/quoteforge/internal/models"
-	"git.mchus.pro/mchus/quoteforge/internal/repository"
-	"git.mchus.pro/mchus/quoteforge/internal/services/alerts"
-	"git.mchus.pro/mchus/quoteforge/internal/services/pricing"
-	"gorm.io/driver/mysql"
-	"gorm.io/gorm"
-	"gorm.io/gorm/logger"
-)
-
-func main() {
-	configPath := flag.String("config", "config.yaml", "path to config file")
-	cronJob := flag.String("job", "", "type of cron job to run (alerts, update-prices)")
-	flag.Parse()
-
-	cfg, err := config.Load(*configPath)
-	if err != nil {
-		log.Fatalf("Failed to load config: %v", err)
-	}
-
-	db, err := gorm.Open(mysql.Open(cfg.Database.DSN()), &gorm.Config{
-		Logger: logger.Default.LogMode(logger.Silent),
-	})
-	if err != nil {
-		log.Fatalf("Failed to connect to database: %v", err)
-	}
-
-	// Ensure tables exist
-	if err := models.Migrate(db); err != nil {
-		log.Fatalf("Migration failed: %v", err)
-	}
-
-	// Initialize repositories
-	statsRepo := repository.NewStatsRepository(db)
-	alertRepo := repository.NewAlertRepository(db)
-	componentRepo := repository.NewComponentRepository(db)
-	priceRepo := repository.NewPriceRepository(db)
-
-	// Initialize services
-	alertService := alerts.NewService(alertRepo, componentRepo, priceRepo, statsRepo, cfg.Alerts, cfg.Pricing)
-	pricingService := pricing.NewService(componentRepo, priceRepo, cfg.Pricing)
-
-	switch *cronJob {
-	case "alerts":
-		log.Println("Running alerts check...")
-		if err := alertService.CheckAndGenerateAlerts(); err != nil {
-			log.Printf("Error running alerts check: %v", err)
-		} else {
-			log.Println("Alerts check completed successfully")
-		}
-	case "update-prices":
-		log.Println("Recalculating all prices...")
-		updated, errors := pricingService.RecalculateAllPrices()
-		log.Printf("Prices recalculated: %d updated, %d errors", updated, errors)
-	case "reset-counters":
-		log.Println("Resetting usage counters...")
-		if err := statsRepo.ResetWeeklyCounters(); err != nil {
-			log.Printf("Error resetting weekly counters: %v", err)
-		}
-		if err := statsRepo.ResetMonthlyCounters(); err != nil {
-			log.Printf("Error resetting monthly counters: %v", err)
-		}
-		log.Println("Usage counters reset completed")
-	case "update-popularity":
-		log.Println("Updating popularity scores...")
-		if err := statsRepo.UpdatePopularityScores(); err != nil {
-			log.Printf("Error updating popularity scores: %v", err)
-		} else {
-			log.Println("Popularity scores updated successfully")
-		}
-	default:
-		log.Println("No valid cron job specified. Available jobs:")
-		log.Println("  - alerts: Check and generate alerts")
-		log.Println("  - update-prices: Recalculate all prices")
-		log.Println("  - reset-counters: Reset usage counters")
-		log.Println("  - update-popularity: Update popularity scores")
-	}
-}

cmd/importer/main.go

@@ -1,160 +0,0 @@
-package main
-
-import (
-	"flag"
-	"log"
-	"strings"
-
-	"git.mchus.pro/mchus/quoteforge/internal/config"
-	"git.mchus.pro/mchus/quoteforge/internal/models"
-	"gorm.io/driver/mysql"
-	"gorm.io/gorm"
-	"gorm.io/gorm/logger"
-)
-
-func main() {
-	configPath := flag.String("config", "config.yaml", "path to config file")
-	flag.Parse()
-
-	cfg, err := config.Load(*configPath)
-	if err != nil {
-		log.Fatalf("Failed to load config: %v", err)
-	}
-
-	db, err := gorm.Open(mysql.Open(cfg.Database.DSN()), &gorm.Config{
-		Logger: logger.Default.LogMode(logger.Silent),
-	})
-	if err != nil {
-		log.Fatalf("Failed to connect to database: %v", err)
-	}
-
-	log.Println("Connected to database")
-
-	// Ensure tables exist
-	if err := models.Migrate(db); err != nil {
-		log.Fatalf("Migration failed: %v", err)
-	}
-	if err := models.SeedCategories(db); err != nil {
-		log.Fatalf("Seeding categories failed: %v", err)
-	}
-
-	// Load categories for lookup
-	var categories []models.Category
-	db.Find(&categories)
-	categoryMap := make(map[string]uint)
-	for _, c := range categories {
-		categoryMap[c.Code] = c.ID
-	}
-	log.Printf("Loaded %d categories", len(categories))
-
-	// Get all lots
-	var lots []models.Lot
-	if err := db.Find(&lots).Error; err != nil {
-		log.Fatalf("Failed to load lots: %v", err)
-	}
-	log.Printf("Found %d lots to import", len(lots))
-
-	// Import each lot
-	var imported, skipped, updated int
-	for _, lot := range lots {
-		category, model := ParsePartNumber(lot.LotName)
-
-		var categoryID *uint
-		if id, ok := categoryMap[category]; ok && id > 0 {
-			categoryID = &id
-		} else {
-			// Try to find by prefix match
-			for code, id := range categoryMap {
-				if strings.HasPrefix(category, code) {
-					categoryID = &id
-					break
-				}
-			}
-		}
-
-		// Check if already exists
-		var existing models.LotMetadata
-		result := db.Where("lot_name = ?", lot.LotName).First(&existing)
-
-		if result.Error == gorm.ErrRecordNotFound {
-			// Check if there are prices in the last 90 days
-			var recentPriceCount int64
-			db.Model(&models.LotLog{}).
-				Where("lot = ? AND date >= DATE_SUB(NOW(), INTERVAL 90 DAY)", lot.LotName).
-				Count(&recentPriceCount)
-
-			// Default to 90 days, but use "all time" (0) if no recent prices
-			periodDays := 90
-			if recentPriceCount == 0 {
-				periodDays = 0
-			}
-
-			// Create new
-			metadata := models.LotMetadata{
-				LotName:         lot.LotName,
-				CategoryID:      categoryID,
-				Model:           model,
-				PricePeriodDays: periodDays,
-			}
-			if err := db.Create(&metadata).Error; err != nil {
-				log.Printf("Failed to create metadata for %s: %v", lot.LotName, err)
-				continue
-			}
-			imported++
-		} else if result.Error == nil {
-			// Update if needed
-			needsUpdate := false
-
-			if existing.Model == "" {
-				existing.Model = model
-				needsUpdate = true
-			}
-			if existing.CategoryID == nil {
-				existing.CategoryID = categoryID
-				needsUpdate = true
-			}
-
-			// Check if using default period (90 days) but no recent prices
-			if existing.PricePeriodDays == 90 {
-				var recentPriceCount int64
-				db.Model(&models.LotLog{}).
-					Where("lot = ? AND date >= DATE_SUB(NOW(), INTERVAL 90 DAY)", lot.LotName).
-					Count(&recentPriceCount)
-
-				if recentPriceCount == 0 {
-					existing.PricePeriodDays = 0
-					needsUpdate = true
-				}
-			}
-
-			if needsUpdate {
-				db.Save(&existing)
-				updated++
-			} else {
-				skipped++
-			}
-		}
-	}
-
-	log.Printf("Import complete: %d imported, %d updated, %d skipped", imported, updated, skipped)
-
-	// Show final counts
-	var metadataCount int64
-	db.Model(&models.LotMetadata{}).Count(&metadataCount)
-	log.Printf("Total metadata records: %d", metadataCount)
-}
-
-// ParsePartNumber extracts category and model from lot_name
-// Examples:
-// "CPU_AMD_9654" → category="CPU", model="AMD_9654"
-// "MB_INTEL_4.Sapphire_2S" → category="MB", model="INTEL_4.Sapphire_2S"
-func ParsePartNumber(lotName string) (category, model string) {
-	parts := strings.SplitN(lotName, "_", 2)
-	if len(parts) >= 1 {
-		category = parts[0]
-	}
-	if len(parts) >= 2 {
-		model = parts[1]
-	}
-	return
-}

cmd/migrate/main.go

@@ -6,7 +6,7 @@ import (
 	"log"
 	"time"
 
-	"git.mchus.pro/mchus/quoteforge/internal/config"
+	"git.mchus.pro/mchus/quoteforge/internal/appstate"
 	"git.mchus.pro/mchus/quoteforge/internal/localdb"
 	"git.mchus.pro/mchus/quoteforge/internal/models"
 	"gorm.io/driver/mysql"
@@ -15,30 +15,17 @@ import (
 )
 
 func main() {
-	configPath := flag.String("config", "config.yaml", "path to config file")
-	localDBPath := flag.String("localdb", "./data/settings.db", "path to local SQLite database")
+	defaultLocalDBPath, err := appstate.ResolveDBPath("")
+	if err != nil {
+		log.Fatalf("Failed to resolve default local SQLite path: %v", err)
+	}
+	localDBPath := flag.String("localdb", defaultLocalDBPath, "path to local SQLite database (default: user state dir or QFS_DB_PATH)")
 	dryRun := flag.Bool("dry-run", false, "show what would be migrated without actually doing it")
 	flag.Parse()
 
 	log.Println("QuoteForge Configuration Migration Tool")
 	log.Println("========================================")
 
-	// Load config for MariaDB connection
-	cfg, err := config.Load(*configPath)
-	if err != nil {
-		log.Fatalf("Failed to load config: %v", err)
-	}
-
-	// Connect to MariaDB
-	log.Printf("Connecting to MariaDB at %s:%d...", cfg.Database.Host, cfg.Database.Port)
-	mariaDB, err := gorm.Open(mysql.Open(cfg.Database.DSN()), &gorm.Config{
-		Logger: logger.Default.LogMode(logger.Silent),
-	})
-	if err != nil {
-		log.Fatalf("Failed to connect to MariaDB: %v", err)
-	}
-	log.Println("Connected to MariaDB")
-
 	// Initialize local SQLite
 	log.Printf("Opening local SQLite at %s...", *localDBPath)
 	local, err := localdb.New(*localDBPath)
@@ -46,6 +33,28 @@ func main() {
 		log.Fatalf("Failed to initialize local database: %v", err)
 	}
 	log.Println("Local SQLite initialized")
+	if !local.HasSettings() {
+		log.Fatalf("SQLite connection settings are not configured. Run qfs setup first.")
+	}
+
+	settings, err := local.GetSettings()
+	if err != nil {
+		log.Fatalf("Failed to load SQLite connection settings: %v", err)
+	}
+	dsn, err := local.GetDSN()
+	if err != nil {
+		log.Fatalf("Failed to build DSN from SQLite settings: %v", err)
+	}
+
+	// Connect to MariaDB
+	log.Printf("Connecting to MariaDB at %s:%d...", settings.Host, settings.Port)
+	mariaDB, err := gorm.Open(mysql.Open(dsn), &gorm.Config{
+		Logger: logger.Default.LogMode(logger.Silent),
+	})
+	if err != nil {
+		log.Fatalf("Failed to connect to MariaDB: %v", err)
+	}
+	log.Println("Connected to MariaDB")
 
 	// Count configurations in MariaDB
 	var serverCount int64
@@ -61,7 +70,7 @@ func main() {
 
 	// Get all configurations from MariaDB
 	var configs []models.Configuration
-	if err := mariaDB.Preload("User").Find(&configs).Error; err != nil {
+	if err := mariaDB.Find(&configs).Error; err != nil {
 		log.Fatalf("Failed to fetch configurations: %v", err)
 	}
 
@@ -72,9 +81,9 @@ func main() {
 	if *dryRun {
 		log.Println("\n[DRY RUN] Would migrate the following configurations:")
 		for _, c := range configs {
-			userName := "unknown"
-			if c.User != nil {
-				userName = c.User.Username
+			userName := c.OwnerUsername
+			if userName == "" {
+				userName = "unknown"
 			}
 			log.Printf("  - %s (UUID: %s, User: %s, Items: %d)", c.Name, c.UUID, userName, len(c.Items))
 		}
@@ -110,20 +119,22 @@ func main() {
 		// Create local configuration
 		now := time.Now()
 		localConfig := &localdb.LocalConfiguration{
-			UUID:           c.UUID,
-			ServerID:       &c.ID,
-			Name:           c.Name,
-			Items:          localItems,
-			TotalPrice:     c.TotalPrice,
-			CustomPrice:    c.CustomPrice,
-			Notes:          c.Notes,
-			IsTemplate:     c.IsTemplate,
-			ServerCount:    c.ServerCount,
-			CreatedAt:      c.CreatedAt,
-			UpdatedAt:      now,
-			SyncedAt:       &now,
-			SyncStatus:     "synced",
-			OriginalUserID: c.UserID,
+			UUID:             c.UUID,
+			ServerID:         &c.ID,
+			ProjectUUID:      c.ProjectUUID,
+			Name:             c.Name,
+			Items:            localItems,
+			TotalPrice:       c.TotalPrice,
+			CustomPrice:      c.CustomPrice,
+			Notes:            c.Notes,
+			IsTemplate:       c.IsTemplate,
+			ServerCount:      c.ServerCount,
+			CreatedAt:        c.CreatedAt,
+			UpdatedAt:        now,
+			SyncedAt:         &now,
+			SyncStatus:       "synced",
+			OriginalUserID:   derefUint(c.UserID),
+			OriginalUsername: c.OwnerUsername,
 		}
 
 		if err := local.SaveConfiguration(localConfig); err != nil {
@@ -142,21 +153,12 @@ func main() {
 	log.Printf("  Skipped:  %d", skipped)
 	log.Printf("  Errors:   %d", errors)
 
-	// Save connection settings to local SQLite if not exists
-	if !local.HasSettings() {
-		log.Println("\nSaving connection settings to local SQLite...")
-		if err := local.SaveSettings(
-			cfg.Database.Host,
-			cfg.Database.Port,
-			cfg.Database.Name,
-			cfg.Database.User,
-			cfg.Database.Password,
-		); err != nil {
-			log.Printf("Warning: Failed to save settings: %v", err)
-		} else {
-			log.Println("Connection settings saved")
-		}
-	}
-
-	fmt.Println("\nDone! You can now run the server with: go run ./cmd/server")
+	fmt.Println("\nDone! You can now run the server with: go run ./cmd/qfs")
+}
+
+func derefUint(v *uint) uint {
+	if v == nil {
+		return 0
+	}
+	return *v
 }

cmd/migrate_ops_projects/main.go

@@ -0,0 +1,296 @@
+package main
+
+import (
+	"bufio"
+	"flag"
+	"fmt"
+	"log"
+	"os"
+	"regexp"
+	"sort"
+	"strings"
+
+	"git.mchus.pro/mchus/quoteforge/internal/appstate"
+	"git.mchus.pro/mchus/quoteforge/internal/localdb"
+	"git.mchus.pro/mchus/quoteforge/internal/models"
+	"github.com/google/uuid"
+	"gorm.io/driver/mysql"
+	"gorm.io/gorm"
+	"gorm.io/gorm/logger"
+)
+
+type configRow struct {
+	ID            uint
+	UUID          string
+	OwnerUsername string
+	Name          string
+	ProjectUUID   *string
+}
+
+type migrationAction struct {
+	ConfigID          uint
+	ConfigUUID        string
+	ConfigName        string
+	OwnerUsername     string
+	TargetProjectName string
+	CurrentProject    string
+	NeedCreateProject bool
+	NeedReactivate    bool
+}
+
+func main() {
+	defaultLocalDBPath, err := appstate.ResolveDBPath("")
+	if err != nil {
+		log.Fatalf("failed to resolve default local SQLite path: %v", err)
+	}
+	localDBPath := flag.String("localdb", defaultLocalDBPath, "path to local SQLite database (default: user state dir or QFS_DB_PATH)")
+	apply := flag.Bool("apply", false, "apply migration (default is preview only)")
+	yes := flag.Bool("yes", false, "skip interactive confirmation (works only with -apply)")
+	flag.Parse()
+
+	local, err := localdb.New(*localDBPath)
+	if err != nil {
+		log.Fatalf("failed to initialize local database: %v", err)
+	}
+	if !local.HasSettings() {
+		log.Fatalf("SQLite connection settings are not configured. Run qfs setup first.")
+	}
+	dsn, err := local.GetDSN()
+	if err != nil {
+		log.Fatalf("failed to build DSN from SQLite settings: %v", err)
+	}
+	dbUser := strings.TrimSpace(local.GetDBUser())
+
+	db, err := gorm.Open(mysql.Open(dsn), &gorm.Config{
+		Logger: logger.Default.LogMode(logger.Silent),
+	})
+	if err != nil {
+		log.Fatalf("failed to connect database: %v", err)
+	}
+
+	if err := ensureProjectsTable(db); err != nil {
+		log.Fatalf("precheck failed: %v", err)
+	}
+
+	actions, existingProjects, err := buildPlan(db, dbUser)
+	if err != nil {
+		log.Fatalf("failed to build migration plan: %v", err)
+	}
+
+	printPlan(actions)
+	if len(actions) == 0 {
+		fmt.Println("Nothing to migrate.")
+		return
+	}
+
+	if !*apply {
+		fmt.Println("\nPreview complete. Re-run with -apply to execute.")
+		return
+	}
+
+	if !*yes {
+		ok, confirmErr := askForConfirmation()
+		if confirmErr != nil {
+			log.Fatalf("confirmation failed: %v", confirmErr)
+		}
+		if !ok {
+			fmt.Println("Aborted.")
+			return
+		}
+	}
+
+	if err := executePlan(db, actions, existingProjects); err != nil {
+		log.Fatalf("migration failed: %v", err)
+	}
+
+	fmt.Println("Migration completed successfully.")
+}
+
+func ensureProjectsTable(db *gorm.DB) error {
+	var count int64
+	if err := db.Raw("SELECT COUNT(*) FROM information_schema.tables WHERE table_schema = DATABASE() AND table_name = 'qt_projects'").Scan(&count).Error; err != nil {
+		return fmt.Errorf("checking qt_projects table: %w", err)
+	}
+	if count == 0 {
+		return fmt.Errorf("table qt_projects does not exist; run migration 009_add_projects.sql first")
+	}
+	return nil
+}
+
+func buildPlan(db *gorm.DB, fallbackOwner string) ([]migrationAction, map[string]*models.Project, error) {
+	var configs []configRow
+	if err := db.Table("qt_configurations").
+		Select("id, uuid, owner_username, name, project_uuid").
+		Find(&configs).Error; err != nil {
+		return nil, nil, fmt.Errorf("load configurations: %w", err)
+	}
+
+	codeRegex := regexp.MustCompile(`^(OPS-[0-9]{4})`)
+	owners := make(map[string]struct{})
+	projectNames := make(map[string]struct{})
+	type candidate struct {
+		config configRow
+		code   string
+		owner  string
+	}
+	candidates := make([]candidate, 0)
+
+	for _, cfg := range configs {
+		match := codeRegex.FindStringSubmatch(strings.TrimSpace(cfg.Name))
+		if len(match) < 2 {
+			continue
+		}
+		owner := strings.TrimSpace(cfg.OwnerUsername)
+		if owner == "" {
+			owner = strings.TrimSpace(fallbackOwner)
+		}
+		if owner == "" {
+			continue
+		}
+		code := match[1]
+		owners[owner] = struct{}{}
+		projectNames[code] = struct{}{}
+		candidates = append(candidates, candidate{config: cfg, code: code, owner: owner})
+	}
+
+	ownerList := setKeys(owners)
+	nameList := setKeys(projectNames)
+	existingProjects := make(map[string]*models.Project)
+	if len(ownerList) > 0 && len(nameList) > 0 {
+		var projects []models.Project
+		if err := db.Where("owner_username IN ? AND name IN ?", ownerList, nameList).Find(&projects).Error; err != nil {
+			return nil, nil, fmt.Errorf("load existing projects: %w", err)
+		}
+		for i := range projects {
+			p := projects[i]
+			existingProjects[projectKey(p.OwnerUsername, p.Name)] = &p
+		}
+	}
+
+	actions := make([]migrationAction, 0)
+	for _, c := range candidates {
+		key := projectKey(c.owner, c.code)
+		existing := existingProjects[key]
+
+		currentProject := ""
+		if c.config.ProjectUUID != nil {
+			currentProject = *c.config.ProjectUUID
+		}
+
+		if existing != nil && currentProject == existing.UUID {
+			continue
+		}
+
+		action := migrationAction{
+			ConfigID:          c.config.ID,
+			ConfigUUID:        c.config.UUID,
+			ConfigName:        c.config.Name,
+			OwnerUsername:     c.owner,
+			TargetProjectName: c.code,
+			CurrentProject:    currentProject,
+		}
+		if existing == nil {
+			action.NeedCreateProject = true
+		} else if !existing.IsActive {
+			action.NeedReactivate = true
+		}
+		actions = append(actions, action)
+	}
+
+	return actions, existingProjects, nil
+}
+
+func printPlan(actions []migrationAction) {
+	createCount := 0
+	reactivateCount := 0
+	for _, a := range actions {
+		if a.NeedCreateProject {
+			createCount++
+		}
+		if a.NeedReactivate {
+			reactivateCount++
+		}
+	}
+
+	fmt.Printf("Planned actions: %d\n", len(actions))
+	fmt.Printf("Projects to create: %d\n", createCount)
+	fmt.Printf("Projects to reactivate: %d\n", reactivateCount)
+	fmt.Println("\nDetails:")
+
+	for _, a := range actions {
+		extra := ""
+		if a.NeedCreateProject {
+			extra = " [create project]"
+		} else if a.NeedReactivate {
+			extra = " [reactivate project]"
+		}
+		current := a.CurrentProject
+		if current == "" {
+			current = "NULL"
+		}
+		fmt.Printf("- %s | owner=%s | \"%s\" | project: %s -> %s%s\n",
+			a.ConfigUUID, a.OwnerUsername, a.ConfigName, current, a.TargetProjectName, extra)
+	}
+}
+
+func askForConfirmation() (bool, error) {
+	fmt.Print("\nApply these changes? type 'yes' to continue: ")
+	reader := bufio.NewReader(os.Stdin)
+	line, err := reader.ReadString('\n')
+	if err != nil {
+		return false, err
+	}
+	return strings.EqualFold(strings.TrimSpace(line), "yes"), nil
+}
+
+func executePlan(db *gorm.DB, actions []migrationAction, existingProjects map[string]*models.Project) error {
+	return db.Transaction(func(tx *gorm.DB) error {
+		projectCache := make(map[string]*models.Project, len(existingProjects))
+		for k, v := range existingProjects {
+			cp := *v
+			projectCache[k] = &cp
+		}
+
+		for _, action := range actions {
+			key := projectKey(action.OwnerUsername, action.TargetProjectName)
+			project := projectCache[key]
+			if project == nil {
+				project = &models.Project{
+					UUID:          uuid.NewString(),
+					OwnerUsername: action.OwnerUsername,
+					Name:          action.TargetProjectName,
+					IsActive:      true,
+					IsSystem:      false,
+				}
+				if err := tx.Create(project).Error; err != nil {
+					return fmt.Errorf("create project %s for owner %s: %w", action.TargetProjectName, action.OwnerUsername, err)
+				}
+				projectCache[key] = project
+			} else if !project.IsActive {
+				if err := tx.Model(&models.Project{}).Where("uuid = ?", project.UUID).Update("is_active", true).Error; err != nil {
+					return fmt.Errorf("reactivate project %s (%s): %w", project.Name, project.UUID, err)
+				}
+				project.IsActive = true
+			}
+
+			if err := tx.Table("qt_configurations").Where("id = ?", action.ConfigID).Update("project_uuid", project.UUID).Error; err != nil {
+				return fmt.Errorf("move configuration %s to project %s: %w", action.ConfigUUID, project.UUID, err)
+			}
+		}
+
+		return nil
+	})
+}
+
+func setKeys(set map[string]struct{}) []string {
+	keys := make([]string, 0, len(set))
+	for k := range set {
+		keys = append(keys, k)
+	}
+	sort.Strings(keys)
+	return keys
+}
+
+func projectKey(owner, name string) string {
+	return owner + "||" + name
+}

cmd/qfs/config_migration_test.go

@@ -0,0 +1,66 @@
+package main
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"git.mchus.pro/mchus/quoteforge/internal/config"
+)
+
+func TestMigrateConfigFileToRuntimeShapeDropsDeprecatedSections(t *testing.T) {
+	t.Helper()
+	dir := t.TempDir()
+	path := filepath.Join(dir, "config.yaml")
+
+	legacy := `server:
+  host: "0.0.0.0"
+  port: 9191
+database:
+  host: "legacy-db"
+  port: 3306
+  name: "RFQ_LOG"
+  user: "old"
+  password: "REDACTED_TEST_PASSWORD"
+pricing:
+  default_method: "median"
+logging:
+  level: "debug"
+  format: "text"
+  output: "stdout"
+`
+	if err := os.WriteFile(path, []byte(legacy), 0644); err != nil {
+		t.Fatalf("write legacy config: %v", err)
+	}
+
+	cfg, err := config.Load(path)
+	if err != nil {
+		t.Fatalf("load legacy config: %v", err)
+	}
+	setConfigDefaults(cfg)
+	if err := migrateConfigFileToRuntimeShape(path, cfg); err != nil {
+		t.Fatalf("migrate config: %v", err)
+	}
+
+	got, err := os.ReadFile(path)
+	if err != nil {
+		t.Fatalf("read migrated config: %v", err)
+	}
+	text := string(got)
+	if strings.Contains(text, "database:") {
+		t.Fatalf("migrated config still contains deprecated database section:\n%s", text)
+	}
+	if strings.Contains(text, "pricing:") {
+		t.Fatalf("migrated config still contains deprecated pricing section:\n%s", text)
+	}
+	if !strings.Contains(text, "server:") || !strings.Contains(text, "logging:") {
+		t.Fatalf("migrated config missing required sections:\n%s", text)
+	}
+	if !strings.Contains(text, "port: 9191") {
+		t.Fatalf("migrated config did not preserve server port:\n%s", text)
+	}
+	if !strings.Contains(text, "level: debug") {
+		t.Fatalf("migrated config did not preserve logging level:\n%s", text)
+	}
+}

cmd/qfs/versioning_api_test.go

@@ -0,0 +1,327 @@
+package main
+
+import (
+	"bytes"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"git.mchus.pro/mchus/quoteforge/internal/config"
+	"git.mchus.pro/mchus/quoteforge/internal/db"
+	"git.mchus.pro/mchus/quoteforge/internal/localdb"
+	"git.mchus.pro/mchus/quoteforge/internal/models"
+	"git.mchus.pro/mchus/quoteforge/internal/services"
+	syncsvc "git.mchus.pro/mchus/quoteforge/internal/services/sync"
+)
+
+func TestConfigurationVersioningAPI(t *testing.T) {
+	moveToRepoRoot(t)
+
+	local, connMgr, configService := newAPITestStack(t)
+	_ = local
+
+	created, err := configService.Create("tester", &services.CreateConfigRequest{
+		Name:        "api-v1",
+		Items:       models.ConfigItems{{LotName: "CPU_API", Quantity: 1, UnitPrice: 1000}},
+		ServerCount: 1,
+	})
+	if err != nil {
+		t.Fatalf("create config: %v", err)
+	}
+	if _, err := configService.RenameNoAuth(created.UUID, "api-v2"); err != nil {
+		t.Fatalf("rename config: %v", err)
+	}
+
+	cfg := &config.Config{}
+	setConfigDefaults(cfg)
+	router, _, err := setupRouter(cfg, local, connMgr, nil, "tester", nil)
+	if err != nil {
+		t.Fatalf("setup router: %v", err)
+	}
+
+	// list versions happy path
+	listReq := httptest.NewRequest(http.MethodGet, "/api/configs/"+created.UUID+"/versions?limit=10&offset=0", nil)
+	listRec := httptest.NewRecorder()
+	router.ServeHTTP(listRec, listReq)
+	if listRec.Code != http.StatusOK {
+		t.Fatalf("list versions status=%d body=%s", listRec.Code, listRec.Body.String())
+	}
+
+	// get version happy path
+	getReq := httptest.NewRequest(http.MethodGet, "/api/configs/"+created.UUID+"/versions/1", nil)
+	getRec := httptest.NewRecorder()
+	router.ServeHTTP(getRec, getReq)
+	if getRec.Code != http.StatusOK {
+		t.Fatalf("get version status=%d body=%s", getRec.Code, getRec.Body.String())
+	}
+
+	// rollback happy path
+	body := []byte(`{"target_version":1,"note":"api rollback"}`)
+	rbReq := httptest.NewRequest(http.MethodPost, "/api/configs/"+created.UUID+"/rollback", bytes.NewReader(body))
+	rbReq.Header.Set("Content-Type", "application/json")
+	rbRec := httptest.NewRecorder()
+	router.ServeHTTP(rbRec, rbReq)
+	if rbRec.Code != http.StatusOK {
+		t.Fatalf("rollback status=%d body=%s", rbRec.Code, rbRec.Body.String())
+	}
+
+	var rbResp struct {
+		Message        string `json:"message"`
+		CurrentVersion struct {
+			VersionNo int `json:"version_no"`
+		} `json:"current_version"`
+	}
+	if err := json.Unmarshal(rbRec.Body.Bytes(), &rbResp); err != nil {
+		t.Fatalf("unmarshal rollback response: %v", err)
+	}
+	if rbResp.Message == "" || rbResp.CurrentVersion.VersionNo != 3 {
+		t.Fatalf("unexpected rollback response: %+v", rbResp)
+	}
+
+	// 404: version missing
+	notFoundReq := httptest.NewRequest(http.MethodGet, "/api/configs/"+created.UUID+"/versions/999", nil)
+	notFoundRec := httptest.NewRecorder()
+	router.ServeHTTP(notFoundRec, notFoundReq)
+	if notFoundRec.Code != http.StatusNotFound {
+		t.Fatalf("expected 404 for missing version, got %d", notFoundRec.Code)
+	}
+
+	// 400: invalid version number
+	invalidReq := httptest.NewRequest(http.MethodGet, "/api/configs/"+created.UUID+"/versions/abc", nil)
+	invalidRec := httptest.NewRecorder()
+	router.ServeHTTP(invalidRec, invalidReq)
+	if invalidRec.Code != http.StatusBadRequest {
+		t.Fatalf("expected 400 for invalid version, got %d", invalidRec.Code)
+	}
+
+	// 400: rollback invalid target_version
+	badRollbackReq := httptest.NewRequest(http.MethodPost, "/api/configs/"+created.UUID+"/rollback", bytes.NewReader([]byte(`{"target_version":0}`)))
+	badRollbackReq.Header.Set("Content-Type", "application/json")
+	badRollbackRec := httptest.NewRecorder()
+	router.ServeHTTP(badRollbackRec, badRollbackReq)
+	if badRollbackRec.Code != http.StatusBadRequest {
+		t.Fatalf("expected 400 for invalid rollback target, got %d", badRollbackRec.Code)
+	}
+
+	// archive + reactivate flow
+	delReq := httptest.NewRequest(http.MethodDelete, "/api/configs/"+created.UUID, nil)
+	delRec := httptest.NewRecorder()
+	router.ServeHTTP(delRec, delReq)
+	if delRec.Code != http.StatusOK {
+		t.Fatalf("archive status=%d body=%s", delRec.Code, delRec.Body.String())
+	}
+
+	archivedListReq := httptest.NewRequest(http.MethodGet, "/api/configs?status=archived&page=1&per_page=20", nil)
+	archivedListRec := httptest.NewRecorder()
+	router.ServeHTTP(archivedListRec, archivedListReq)
+	if archivedListRec.Code != http.StatusOK {
+		t.Fatalf("archived list status=%d body=%s", archivedListRec.Code, archivedListRec.Body.String())
+	}
+
+	reactivateReq := httptest.NewRequest(http.MethodPost, "/api/configs/"+created.UUID+"/reactivate", nil)
+	reactivateRec := httptest.NewRecorder()
+	router.ServeHTTP(reactivateRec, reactivateReq)
+	if reactivateRec.Code != http.StatusOK {
+		t.Fatalf("reactivate status=%d body=%s", reactivateRec.Code, reactivateRec.Body.String())
+	}
+
+	activeListReq := httptest.NewRequest(http.MethodGet, "/api/configs?status=active&page=1&per_page=20", nil)
+	activeListRec := httptest.NewRecorder()
+	router.ServeHTTP(activeListRec, activeListReq)
+	if activeListRec.Code != http.StatusOK {
+		t.Fatalf("active list status=%d body=%s", activeListRec.Code, activeListRec.Body.String())
+	}
+}
+
+func TestProjectArchiveHidesConfigsAndCloneIntoProject(t *testing.T) {
+	moveToRepoRoot(t)
+
+	local, connMgr, configService := newAPITestStack(t)
+	_ = configService
+
+	cfg := &config.Config{}
+	setConfigDefaults(cfg)
+	router, _, err := setupRouter(cfg, local, connMgr, nil, "tester", nil)
+	if err != nil {
+		t.Fatalf("setup router: %v", err)
+	}
+
+	createProjectReq := httptest.NewRequest(http.MethodPost, "/api/projects", bytes.NewReader([]byte(`{"name":"P1"}`)))
+	createProjectReq.Header.Set("Content-Type", "application/json")
+	createProjectRec := httptest.NewRecorder()
+	router.ServeHTTP(createProjectRec, createProjectReq)
+	if createProjectRec.Code != http.StatusCreated {
+		t.Fatalf("create project status=%d body=%s", createProjectRec.Code, createProjectRec.Body.String())
+	}
+	var project models.Project
+	if err := json.Unmarshal(createProjectRec.Body.Bytes(), &project); err != nil {
+		t.Fatalf("unmarshal project: %v", err)
+	}
+
+	createCfgBody := []byte(`{"name":"Cfg A","items":[{"lot_name":"CPU","quantity":1,"unit_price":100}],"server_count":1}`)
+	createCfgReq := httptest.NewRequest(http.MethodPost, "/api/projects/"+project.UUID+"/configs", bytes.NewReader(createCfgBody))
+	createCfgReq.Header.Set("Content-Type", "application/json")
+	createCfgRec := httptest.NewRecorder()
+	router.ServeHTTP(createCfgRec, createCfgReq)
+	if createCfgRec.Code != http.StatusCreated {
+		t.Fatalf("create project config status=%d body=%s", createCfgRec.Code, createCfgRec.Body.String())
+	}
+	var createdCfg models.Configuration
+	if err := json.Unmarshal(createCfgRec.Body.Bytes(), &createdCfg); err != nil {
+		t.Fatalf("unmarshal project config: %v", err)
+	}
+	if createdCfg.ProjectUUID == nil || *createdCfg.ProjectUUID != project.UUID {
+		t.Fatalf("expected config project_uuid=%s got=%v", project.UUID, createdCfg.ProjectUUID)
+	}
+
+	cloneReq := httptest.NewRequest(http.MethodPost, "/api/projects/"+project.UUID+"/configs/"+createdCfg.UUID+"/clone", bytes.NewReader([]byte(`{"name":"Cfg A Clone"}`)))
+	cloneReq.Header.Set("Content-Type", "application/json")
+	cloneRec := httptest.NewRecorder()
+	router.ServeHTTP(cloneRec, cloneReq)
+	if cloneRec.Code != http.StatusCreated {
+		t.Fatalf("clone in project status=%d body=%s", cloneRec.Code, cloneRec.Body.String())
+	}
+	var cloneCfg models.Configuration
+	if err := json.Unmarshal(cloneRec.Body.Bytes(), &cloneCfg); err != nil {
+		t.Fatalf("unmarshal clone config: %v", err)
+	}
+	if cloneCfg.ProjectUUID == nil || *cloneCfg.ProjectUUID != project.UUID {
+		t.Fatalf("expected clone project_uuid=%s got=%v", project.UUID, cloneCfg.ProjectUUID)
+	}
+
+	projectConfigsReq := httptest.NewRequest(http.MethodGet, "/api/projects/"+project.UUID+"/configs", nil)
+	projectConfigsRec := httptest.NewRecorder()
+	router.ServeHTTP(projectConfigsRec, projectConfigsReq)
+	if projectConfigsRec.Code != http.StatusOK {
+		t.Fatalf("project configs status=%d body=%s", projectConfigsRec.Code, projectConfigsRec.Body.String())
+	}
+	var projectConfigsResp struct {
+		Configurations []models.Configuration `json:"configurations"`
+	}
+	if err := json.Unmarshal(projectConfigsRec.Body.Bytes(), &projectConfigsResp); err != nil {
+		t.Fatalf("unmarshal project configs response: %v", err)
+	}
+	if len(projectConfigsResp.Configurations) != 2 {
+		t.Fatalf("expected 2 project configs after clone, got %d", len(projectConfigsResp.Configurations))
+	}
+
+	archiveReq := httptest.NewRequest(http.MethodPost, "/api/projects/"+project.UUID+"/archive", nil)
+	archiveRec := httptest.NewRecorder()
+	router.ServeHTTP(archiveRec, archiveReq)
+	if archiveRec.Code != http.StatusOK {
+		t.Fatalf("archive project status=%d body=%s", archiveRec.Code, archiveRec.Body.String())
+	}
+
+	activeReq := httptest.NewRequest(http.MethodGet, "/api/configs?status=active&page=1&per_page=20", nil)
+	activeRec := httptest.NewRecorder()
+	router.ServeHTTP(activeRec, activeReq)
+	if activeRec.Code != http.StatusOK {
+		t.Fatalf("active configs status=%d body=%s", activeRec.Code, activeRec.Body.String())
+	}
+	var activeResp struct {
+		Configurations []models.Configuration `json:"configurations"`
+	}
+	if err := json.Unmarshal(activeRec.Body.Bytes(), &activeResp); err != nil {
+		t.Fatalf("unmarshal active configs response: %v", err)
+	}
+	if len(activeResp.Configurations) != 0 {
+		t.Fatalf("expected no active configs after project archive, got %d", len(activeResp.Configurations))
+	}
+}
+
+func TestConfigMoveToProjectEndpoint(t *testing.T) {
+	moveToRepoRoot(t)
+
+	local, connMgr, _ := newAPITestStack(t)
+	cfg := &config.Config{}
+	setConfigDefaults(cfg)
+	router, _, err := setupRouter(cfg, local, connMgr, nil, "tester", nil)
+	if err != nil {
+		t.Fatalf("setup router: %v", err)
+	}
+
+	createProjectReq := httptest.NewRequest(http.MethodPost, "/api/projects", bytes.NewReader([]byte(`{"name":"Move Project"}`)))
+	createProjectReq.Header.Set("Content-Type", "application/json")
+	createProjectRec := httptest.NewRecorder()
+	router.ServeHTTP(createProjectRec, createProjectReq)
+	if createProjectRec.Code != http.StatusCreated {
+		t.Fatalf("create project status=%d body=%s", createProjectRec.Code, createProjectRec.Body.String())
+	}
+	var project models.Project
+	if err := json.Unmarshal(createProjectRec.Body.Bytes(), &project); err != nil {
+		t.Fatalf("unmarshal project: %v", err)
+	}
+
+	createConfigReq := httptest.NewRequest(http.MethodPost, "/api/configs", bytes.NewReader([]byte(`{"name":"Move Me","items":[],"notes":"","server_count":1}`)))
+	createConfigReq.Header.Set("Content-Type", "application/json")
+	createConfigRec := httptest.NewRecorder()
+	router.ServeHTTP(createConfigRec, createConfigReq)
+	if createConfigRec.Code != http.StatusCreated {
+		t.Fatalf("create config status=%d body=%s", createConfigRec.Code, createConfigRec.Body.String())
+	}
+	var created models.Configuration
+	if err := json.Unmarshal(createConfigRec.Body.Bytes(), &created); err != nil {
+		t.Fatalf("unmarshal config: %v", err)
+	}
+
+	moveReq := httptest.NewRequest(http.MethodPatch, "/api/configs/"+created.UUID+"/project", bytes.NewReader([]byte(`{"project_uuid":"`+project.UUID+`"}`)))
+	moveReq.Header.Set("Content-Type", "application/json")
+	moveRec := httptest.NewRecorder()
+	router.ServeHTTP(moveRec, moveReq)
+	if moveRec.Code != http.StatusOK {
+		t.Fatalf("move config status=%d body=%s", moveRec.Code, moveRec.Body.String())
+	}
+
+	getReq := httptest.NewRequest(http.MethodGet, "/api/configs/"+created.UUID, nil)
+	getRec := httptest.NewRecorder()
+	router.ServeHTTP(getRec, getReq)
+	if getRec.Code != http.StatusOK {
+		t.Fatalf("get config status=%d body=%s", getRec.Code, getRec.Body.String())
+	}
+	var updated models.Configuration
+	if err := json.Unmarshal(getRec.Body.Bytes(), &updated); err != nil {
+		t.Fatalf("unmarshal updated config: %v", err)
+	}
+	if updated.ProjectUUID == nil || *updated.ProjectUUID != project.UUID {
+		t.Fatalf("expected moved project_uuid=%s, got %v", project.UUID, updated.ProjectUUID)
+	}
+}
+
+func newAPITestStack(t *testing.T) (*localdb.LocalDB, *db.ConnectionManager, *services.LocalConfigurationService) {
+	t.Helper()
+
+	localPath := filepath.Join(t.TempDir(), "api.db")
+	local, err := localdb.New(localPath)
+	if err != nil {
+		t.Fatalf("init local db: %v", err)
+	}
+	t.Cleanup(func() { _ = local.Close() })
+
+	connMgr := db.NewConnectionManager(local)
+	syncService := syncsvc.NewService(connMgr, local)
+	configService := services.NewLocalConfigurationService(
+		local,
+		syncService,
+		&services.QuoteService{},
+		func() bool { return false },
+	)
+	return local, connMgr, configService
+}
+
+func moveToRepoRoot(t *testing.T) {
+	t.Helper()
+	wd, err := os.Getwd()
+	if err != nil {
+		t.Fatalf("getwd: %v", err)
+	}
+	root := filepath.Clean(filepath.Join(wd, "..", ".."))
+	if err := os.Chdir(root); err != nil {
+		t.Fatalf("chdir repo root: %v", err)
+	}
+	t.Cleanup(func() {
+		_ = os.Chdir(wd)
+	})
+}

cmd/server/main.go

@@ -1,735 +0,0 @@
-package main
-
-import (
-	"context"
-	"flag"
-	"fmt"
-	"log/slog"
-	"net/http"
-	"os"
-	"os/signal"
-	"strconv"
-	"syscall"
-	"time"
-
-	qfassets "git.mchus.pro/mchus/quoteforge"
-	"git.mchus.pro/mchus/quoteforge/internal/config"
-	"git.mchus.pro/mchus/quoteforge/internal/db"
-	"git.mchus.pro/mchus/quoteforge/internal/handlers"
-	"git.mchus.pro/mchus/quoteforge/internal/localdb"
-	"git.mchus.pro/mchus/quoteforge/internal/middleware"
-	"git.mchus.pro/mchus/quoteforge/internal/models"
-	"git.mchus.pro/mchus/quoteforge/internal/repository"
-	"git.mchus.pro/mchus/quoteforge/internal/services"
-	"git.mchus.pro/mchus/quoteforge/internal/services/alerts"
-	"git.mchus.pro/mchus/quoteforge/internal/services/pricelist"
-	"git.mchus.pro/mchus/quoteforge/internal/services/pricing"
-	"git.mchus.pro/mchus/quoteforge/internal/services/sync"
-	"github.com/gin-gonic/gin"
-	"gorm.io/driver/mysql"
-	"gorm.io/gorm"
-	"gorm.io/gorm/logger"
-)
-
-const (
-	localDBPath = "./data/settings.db"
-)
-
-func main() {
-	configPath := flag.String("config", "config.yaml", "path to config file (optional, for server settings)")
-	migrate := flag.Bool("migrate", false, "run database migrations")
-	flag.Parse()
-
-	// Initialize local SQLite database (always used)
-	local, err := localdb.New(localDBPath)
-	if err != nil {
-		slog.Error("failed to initialize local database", "error", err)
-		os.Exit(1)
-	}
-
-	// Check if running in setup mode (no connection settings)
-	if !local.HasSettings() {
-		slog.Info("no database settings found, starting setup mode")
-		runSetupMode(local)
-		return
-	}
-
-	// Load config for server settings (optional)
-	cfg, err := config.Load(*configPath)
-	if err != nil {
-		if os.IsNotExist(err) {
-			// Use defaults if config file doesn't exist
-			slog.Info("config file not found, using defaults", "path", *configPath)
-			cfg = &config.Config{}
-		} else {
-			slog.Error("failed to load config", "path", *configPath, "error", err)
-			os.Exit(1)
-		}
-	}
-	setConfigDefaults(cfg)
-
-	setupLogger(cfg.Logging)
-
-	// Create connection manager and try to connect immediately if settings exist
-	connMgr := db.NewConnectionManager(local)
-
-	dbUser := local.GetDBUser()
-	dbUserID := uint(1)
-
-	// Try to connect to MariaDB on startup
-	mariaDB, err := connMgr.GetDB()
-	if err != nil {
-		slog.Warn("failed to connect to MariaDB on startup, starting in offline mode", "error", err)
-		mariaDB = nil
-	} else {
-		slog.Info("successfully connected to MariaDB on startup")
-		// Ensure DB user exists and get their ID
-		if dbUserID, err = models.EnsureDBUser(mariaDB, dbUser); err != nil {
-			slog.Error("failed to ensure DB user", "error", err)
-			// Continue with default ID
-			dbUserID = uint(1)
-		}
-	}
-
-	slog.Info("starting QuoteForge server",
-		"host", cfg.Server.Host,
-		"port", cfg.Server.Port,
-		"db_user", dbUser,
-		"db_user_id", dbUserID,
-		"online", mariaDB != nil,
-	)
-
-	if *migrate {
-		if mariaDB == nil {
-			slog.Error("cannot run migrations: database not available")
-			os.Exit(1)
-		}
-		slog.Info("running database migrations...")
-		if err := models.Migrate(mariaDB); err != nil {
-			slog.Error("migration failed", "error", err)
-			os.Exit(1)
-		}
-		if err := models.SeedCategories(mariaDB); err != nil {
-			slog.Error("seeding categories failed", "error", err)
-			os.Exit(1)
-		}
-		slog.Info("migrations completed")
-	}
-
-	gin.SetMode(cfg.Server.Mode)
-	router, syncService, err := setupRouter(cfg, local, connMgr, mariaDB, dbUserID)
-	if err != nil {
-		slog.Error("failed to setup router", "error", err)
-		os.Exit(1)
-	}
-
-	// Start background sync worker (will auto-skip when offline)
-	workerCtx, workerCancel := context.WithCancel(context.Background())
-	defer workerCancel()
-
-	syncWorker := sync.NewWorker(syncService, connMgr, 5*time.Minute)
-	go syncWorker.Start(workerCtx)
-
-	srv := &http.Server{
-		Addr:         cfg.Address(),
-		Handler:      router,
-		ReadTimeout:  cfg.Server.ReadTimeout,
-		WriteTimeout: cfg.Server.WriteTimeout,
-	}
-
-	go func() {
-		slog.Info("server listening", "address", cfg.Address())
-		if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
-			slog.Error("server error", "error", err)
-			os.Exit(1)
-		}
-	}()
-
-	quit := make(chan os.Signal, 1)
-	signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
-	<-quit
-
-	slog.Info("shutting down server...")
-
-	// Stop background sync worker first
-	syncWorker.Stop()
-	workerCancel()
-
-	// Then shutdown HTTP server
-	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
-	defer cancel()
-
-	if err := srv.Shutdown(ctx); err != nil {
-		slog.Error("server forced to shutdown", "error", err)
-	}
-
-	slog.Info("server stopped")
-}
-
-func setConfigDefaults(cfg *config.Config) {
-	if cfg.Server.Host == "" {
-		cfg.Server.Host = "0.0.0.0"
-	}
-	if cfg.Server.Port == 0 {
-		cfg.Server.Port = 8080
-	}
-	if cfg.Server.Mode == "" {
-		cfg.Server.Mode = "release"
-	}
-	if cfg.Server.ReadTimeout == 0 {
-		cfg.Server.ReadTimeout = 30 * time.Second
-	}
-	if cfg.Server.WriteTimeout == 0 {
-		cfg.Server.WriteTimeout = 30 * time.Second
-	}
-	if cfg.Pricing.DefaultMethod == "" {
-		cfg.Pricing.DefaultMethod = "weighted_median"
-	}
-	if cfg.Pricing.DefaultPeriodDays == 0 {
-		cfg.Pricing.DefaultPeriodDays = 90
-	}
-	if cfg.Pricing.FreshnessGreenDays == 0 {
-		cfg.Pricing.FreshnessGreenDays = 30
-	}
-	if cfg.Pricing.FreshnessYellowDays == 0 {
-		cfg.Pricing.FreshnessYellowDays = 60
-	}
-	if cfg.Pricing.FreshnessRedDays == 0 {
-		cfg.Pricing.FreshnessRedDays = 90
-	}
-	if cfg.Pricing.MinQuotesForMedian == 0 {
-		cfg.Pricing.MinQuotesForMedian = 3
-	}
-}
-
-// runSetupMode starts a minimal server that only serves the setup page
-func runSetupMode(local *localdb.LocalDB) {
-	restartSig := make(chan struct{}, 1)
-
-	// In setup mode, we don't have a connection manager yet (will restart after setup)
-	setupHandler, err := handlers.NewSetupHandler(local, nil, "web/templates", restartSig)
-	if err != nil {
-		slog.Error("failed to create setup handler", "error", err)
-		os.Exit(1)
-	}
-
-	gin.SetMode(gin.ReleaseMode)
-	router := gin.New()
-	router.Use(gin.Recovery())
-
-	if stat, err := os.Stat("web/static"); err == nil && stat.IsDir() {
-		router.Static("/static", "web/static")
-	} else if staticFS, err := qfassets.StaticFS(); err == nil {
-		router.StaticFS("/static", http.FS(staticFS))
-	}
-
-	// Setup routes only
-	router.GET("/", func(c *gin.Context) {
-		c.Redirect(http.StatusFound, "/setup")
-	})
-	router.GET("/setup", setupHandler.ShowSetup)
-	router.POST("/setup", setupHandler.SaveConnection)
-	router.POST("/setup/test", setupHandler.TestConnection)
-	router.GET("/setup/status", setupHandler.GetStatus)
-
-	// Health check
-	router.GET("/health", func(c *gin.Context) {
-		c.JSON(http.StatusOK, gin.H{
-			"status": "setup_required",
-			"time":   time.Now().UTC().Format(time.RFC3339),
-		})
-	})
-
-	addr := ":8080"
-	slog.Info("starting setup mode server", "address", addr)
-	slog.Info("open http://localhost:8080/setup to configure database connection")
-
-	srv := &http.Server{
-		Addr:    addr,
-		Handler: router,
-	}
-
-	go func() {
-		if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
-			slog.Error("server error", "error", err)
-			os.Exit(1)
-		}
-	}()
-
-	quit := make(chan os.Signal, 1)
-	signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
-
-	select {
-	case <-quit:
-		slog.Info("setup mode server stopped")
-	case <-restartSig:
-		slog.Info("restarting application with saved settings...")
-
-		// Graceful shutdown
-		ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
-		defer cancel()
-		srv.Shutdown(ctx)
-
-		// Restart process with same arguments
-		restartProcess()
-	}
-}
-
-func setupLogger(cfg config.LoggingConfig) {
-	var level slog.Level
-	switch cfg.Level {
-	case "debug":
-		level = slog.LevelDebug
-	case "warn":
-		level = slog.LevelWarn
-	case "error":
-		level = slog.LevelError
-	default:
-		level = slog.LevelInfo
-	}
-
-	opts := &slog.HandlerOptions{Level: level}
-
-	var handler slog.Handler
-	if cfg.Format == "json" {
-		handler = slog.NewJSONHandler(os.Stdout, opts)
-	} else {
-		handler = slog.NewTextHandler(os.Stdout, opts)
-	}
-
-	slog.SetDefault(slog.New(handler))
-}
-
-func setupDatabaseFromDSN(dsn string) (*gorm.DB, error) {
-	gormLogger := logger.Default.LogMode(logger.Silent)
-
-	db, err := gorm.Open(mysql.Open(dsn), &gorm.Config{
-		Logger: gormLogger,
-	})
-	if err != nil {
-		return nil, err
-	}
-
-	sqlDB, err := db.DB()
-	if err != nil {
-		return nil, err
-	}
-
-	sqlDB.SetMaxOpenConns(25)
-	sqlDB.SetMaxIdleConns(5)
-	sqlDB.SetConnMaxLifetime(5 * time.Minute)
-
-	return db, nil
-}
-
-func setupRouter(cfg *config.Config, local *localdb.LocalDB, connMgr *db.ConnectionManager, mariaDB *gorm.DB, dbUserID uint) (*gin.Engine, *sync.Service, error) {
-	// mariaDB may be nil if we're in offline mode
-
-	// Repositories
-	var componentRepo *repository.ComponentRepository
-	var categoryRepo *repository.CategoryRepository
-	var priceRepo *repository.PriceRepository
-	var alertRepo *repository.AlertRepository
-	var statsRepo *repository.StatsRepository
-	var pricelistRepo *repository.PricelistRepository
-
-	// Only initialize repositories if we have a database connection
-	if mariaDB != nil {
-		componentRepo = repository.NewComponentRepository(mariaDB)
-		categoryRepo = repository.NewCategoryRepository(mariaDB)
-		priceRepo = repository.NewPriceRepository(mariaDB)
-		alertRepo = repository.NewAlertRepository(mariaDB)
-		statsRepo = repository.NewStatsRepository(mariaDB)
-		pricelistRepo = repository.NewPricelistRepository(mariaDB)
-	} else {
-		// In offline mode, we'll use nil repositories or handle them differently
-		// This is handled in the sync service and other components
-	}
-
-	// Services
-	var pricingService *pricing.Service
-	var componentService *services.ComponentService
-	var quoteService *services.QuoteService
-	var exportService *services.ExportService
-	var alertService *alerts.Service
-	var pricelistService *pricelist.Service
-	var syncService *sync.Service
-
-	// Sync service always uses ConnectionManager (works offline and online)
-	syncService = sync.NewService(connMgr, local)
-
-	if mariaDB != nil {
-		pricingService = pricing.NewService(componentRepo, priceRepo, cfg.Pricing)
-		componentService = services.NewComponentService(componentRepo, categoryRepo, statsRepo)
-		quoteService = services.NewQuoteService(componentRepo, statsRepo, pricingService)
-		exportService = services.NewExportService(cfg.Export, categoryRepo)
-		alertService = alerts.NewService(alertRepo, componentRepo, priceRepo, statsRepo, cfg.Alerts, cfg.Pricing)
-		pricelistService = pricelist.NewService(mariaDB, pricelistRepo, componentRepo)
-	} else {
-		// In offline mode, we still need to create services that don't require DB
-		pricingService = pricing.NewService(nil, nil, cfg.Pricing)
-		componentService = services.NewComponentService(nil, nil, nil)
-		quoteService = services.NewQuoteService(nil, nil, pricingService)
-		exportService = services.NewExportService(cfg.Export, nil)
-		alertService = alerts.NewService(nil, nil, nil, nil, cfg.Alerts, cfg.Pricing)
-		pricelistService = pricelist.NewService(nil, nil, nil)
-	}
-
-	// isOnline function for local-first architecture
-	isOnline := func() bool {
-		return connMgr.IsOnline()
-	}
-
-	// Local-first configuration service (replaces old ConfigurationService)
-	configService := services.NewLocalConfigurationService(local, syncService, quoteService, isOnline)
-
-	// Handlers
-	componentHandler := handlers.NewComponentHandler(componentService, local)
-	quoteHandler := handlers.NewQuoteHandler(quoteService)
-	exportHandler := handlers.NewExportHandler(exportService, configService, componentService)
-	pricingHandler := handlers.NewPricingHandler(mariaDB, pricingService, alertService, componentRepo, priceRepo, statsRepo)
-	pricelistHandler := handlers.NewPricelistHandler(pricelistService, local)
-	syncHandler, err := handlers.NewSyncHandler(local, syncService, connMgr, "web/templates")
-	if err != nil {
-		return nil, nil, fmt.Errorf("creating sync handler: %w", err)
-	}
-
-	// Setup handler (for reconfiguration) - no restart signal in normal mode
-	setupHandler, err := handlers.NewSetupHandler(local, connMgr, "web/templates", nil)
-	if err != nil {
-		return nil, nil, fmt.Errorf("creating setup handler: %w", err)
-	}
-
-	// Web handler (templates)
-	webHandler, err := handlers.NewWebHandler("web/templates", componentService)
-	if err != nil {
-		return nil, nil, err
-	}
-
-	// Router
-	router := gin.New()
-	router.Use(gin.Recovery())
-	router.Use(requestLogger())
-	router.Use(middleware.CORS())
-	router.Use(middleware.OfflineDetector(connMgr, local))
-
-	// Static files
-	if stat, err := os.Stat("web/static"); err == nil && stat.IsDir() {
-		router.Static("/static", "web/static")
-	} else if staticFS, err := qfassets.StaticFS(); err == nil {
-		router.StaticFS("/static", http.FS(staticFS))
-	}
-
-	// Health check
-	router.GET("/health", func(c *gin.Context) {
-		c.JSON(http.StatusOK, gin.H{
-			"status": "ok",
-			"time":   time.Now().UTC().Format(time.RFC3339),
-		})
-	})
-
-	// DB status endpoint
-	router.GET("/api/db-status", func(c *gin.Context) {
-		var lotCount, lotLogCount, metadataCount int64
-		var dbOK bool = false
-		var dbError string
-
-		// Check if connection exists (fast check, no reconnect attempt)
-		status := connMgr.GetStatus()
-		if status.IsConnected {
-			// Already connected, safe to use
-			if db, err := connMgr.GetDB(); err == nil && db != nil {
-				dbOK = true
-				db.Table("lot").Count(&lotCount)
-				db.Table("lot_log").Count(&lotLogCount)
-				db.Table("qt_lot_metadata").Count(&metadataCount)
-			}
-		} else {
-			// Not connected - don't try to reconnect on status check
-			// This prevents 3s timeout on every request
-			dbError = "Database not connected (offline mode)"
-			if status.LastError != "" {
-				dbError = status.LastError
-			}
-		}
-
-		c.JSON(http.StatusOK, gin.H{
-			"connected":      dbOK,
-			"error":          dbError,
-			"lot_count":      lotCount,
-			"lot_log_count":  lotLogCount,
-			"metadata_count": metadataCount,
-			"db_user":        local.GetDBUser(),
-		})
-	})
-
-	// Current user info (DB user, not app user)
-	router.GET("/api/current-user", func(c *gin.Context) {
-		c.JSON(http.StatusOK, gin.H{
-			"username": local.GetDBUser(),
-			"role":     "db_user",
-		})
-	})
-
-	// Setup routes (for reconfiguration)
-	router.GET("/setup", setupHandler.ShowSetup)
-	router.POST("/setup", setupHandler.SaveConnection)
-	router.POST("/setup/test", setupHandler.TestConnection)
-	router.GET("/setup/status", setupHandler.GetStatus)
-
-	// Web pages
-	router.GET("/", webHandler.Index)
-	router.GET("/configs", webHandler.Configs)
-	router.GET("/configurator", webHandler.Configurator)
-	router.GET("/pricelists", func(c *gin.Context) {
-		// Redirect to admin/pricing with pricelists tab
-		c.Redirect(http.StatusFound, "/admin/pricing?tab=pricelists")
-	})
-	router.GET("/pricelists/:id", webHandler.PricelistDetail)
-	router.GET("/admin/pricing", webHandler.AdminPricing)
-
-	// htmx partials
-	partials := router.Group("/partials")
-	{
-		partials.GET("/components", webHandler.ComponentsPartial)
-		partials.GET("/sync-status", syncHandler.SyncStatusPartial)
-	}
-
-	// API routes
-	api := router.Group("/api")
-	{
-		api.GET("/ping", func(c *gin.Context) {
-			c.JSON(http.StatusOK, gin.H{"message": "pong"})
-		})
-
-		// Components (public read)
-		components := api.Group("/components")
-		{
-			components.GET("", componentHandler.List)
-			components.GET("/:lot_name", componentHandler.Get)
-		}
-
-		// Categories (public)
-		api.GET("/categories", componentHandler.GetCategories)
-
-		// Quote (public)
-		quote := api.Group("/quote")
-		{
-			quote.POST("/validate", quoteHandler.Validate)
-			quote.POST("/calculate", quoteHandler.Calculate)
-		}
-
-		// Export (public)
-		export := api.Group("/export")
-		{
-			export.POST("/csv", exportHandler.ExportCSV)
-		}
-
-		// Pricelists (public - RBAC disabled in Phase 1-3)
-		pricelists := api.Group("/pricelists")
-		{
-			pricelists.GET("", pricelistHandler.List)
-			pricelists.GET("/can-write", pricelistHandler.CanWrite)
-			pricelists.GET("/latest", pricelistHandler.GetLatest)
-			pricelists.GET("/:id", pricelistHandler.Get)
-			pricelists.GET("/:id/items", pricelistHandler.GetItems)
-			pricelists.POST("", pricelistHandler.Create)
-			pricelists.DELETE("/:id", pricelistHandler.Delete)
-		}
-
-		// Configurations (public - RBAC disabled)
-		configs := api.Group("/configs")
-		{
-			configs.GET("", func(c *gin.Context) {
-				page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
-				perPage, _ := strconv.Atoi(c.DefaultQuery("per_page", "20"))
-
-				cfgs, total, err := configService.ListAll(page, perPage)
-				if err != nil {
-					c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
-					return
-				}
-
-				c.JSON(http.StatusOK, gin.H{
-					"configurations": cfgs,
-					"total":          total,
-					"page":           page,
-					"per_page":       perPage,
-				})
-			})
-
-			configs.POST("", func(c *gin.Context) {
-				var req services.CreateConfigRequest
-				if err := c.ShouldBindJSON(&req); err != nil {
-					c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
-					return
-				}
-
-				config, err := configService.Create(dbUserID, &req) // use DB user ID
-				if err != nil {
-					c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
-					return
-				}
-
-				c.JSON(http.StatusCreated, config)
-			})
-
-			configs.GET("/:uuid", func(c *gin.Context) {
-				uuid := c.Param("uuid")
-				config, err := configService.GetByUUIDNoAuth(uuid)
-				if err != nil {
-					c.JSON(http.StatusNotFound, gin.H{"error": "configuration not found"})
-					return
-				}
-				c.JSON(http.StatusOK, config)
-			})
-
-			configs.PUT("/:uuid", func(c *gin.Context) {
-				uuid := c.Param("uuid")
-				var req services.CreateConfigRequest
-				if err := c.ShouldBindJSON(&req); err != nil {
-					c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
-					return
-				}
-
-				config, err := configService.UpdateNoAuth(uuid, &req)
-				if err != nil {
-					c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
-					return
-				}
-
-				c.JSON(http.StatusOK, config)
-			})
-
-			configs.DELETE("/:uuid", func(c *gin.Context) {
-				uuid := c.Param("uuid")
-				if err := configService.DeleteNoAuth(uuid); err != nil {
-					c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
-					return
-				}
-				c.JSON(http.StatusOK, gin.H{"message": "deleted"})
-			})
-
-			configs.PATCH("/:uuid/rename", func(c *gin.Context) {
-				uuid := c.Param("uuid")
-				var req struct {
-					Name string `json:"name"`
-				}
-				if err := c.ShouldBindJSON(&req); err != nil {
-					c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
-					return
-				}
-
-				config, err := configService.RenameNoAuth(uuid, req.Name)
-				if err != nil {
-					c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
-					return
-				}
-
-				c.JSON(http.StatusOK, config)
-			})
-
-			configs.POST("/:uuid/clone", func(c *gin.Context) {
-				uuid := c.Param("uuid")
-				var req struct {
-					Name string `json:"name"`
-				}
-				if err := c.ShouldBindJSON(&req); err != nil {
-					c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
-					return
-				}
-
-				config, err := configService.CloneNoAuth(uuid, req.Name, dbUserID)
-				if err != nil {
-					c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
-					return
-				}
-
-				c.JSON(http.StatusCreated, config)
-			})
-
-			configs.POST("/:uuid/refresh-prices", func(c *gin.Context) {
-				uuid := c.Param("uuid")
-				config, err := configService.RefreshPricesNoAuth(uuid)
-				if err != nil {
-					c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
-					return
-				}
-				c.JSON(http.StatusOK, config)
-			})
-		}
-
-		// Pricing admin (public - RBAC disabled)
-		pricingAdmin := api.Group("/admin/pricing")
-		{
-			pricingAdmin.GET("/stats", pricingHandler.GetStats)
-			pricingAdmin.GET("/components", pricingHandler.ListComponents)
-			pricingAdmin.GET("/components/:lot_name", pricingHandler.GetComponentPricing)
-			pricingAdmin.POST("/update", pricingHandler.UpdatePrice)
-			pricingAdmin.POST("/preview", pricingHandler.PreviewPrice)
-			pricingAdmin.POST("/recalculate-all", pricingHandler.RecalculateAll)
-
-			pricingAdmin.GET("/alerts", pricingHandler.ListAlerts)
-			pricingAdmin.POST("/alerts/:id/acknowledge", pricingHandler.AcknowledgeAlert)
-			pricingAdmin.POST("/alerts/:id/resolve", pricingHandler.ResolveAlert)
-			pricingAdmin.POST("/alerts/:id/ignore", pricingHandler.IgnoreAlert)
-		}
-
-		// Sync API (for offline mode)
-		syncAPI := api.Group("/sync")
-		{
-			syncAPI.GET("/status", syncHandler.GetStatus)
-			syncAPI.GET("/info", syncHandler.GetInfo)
-			syncAPI.POST("/components", syncHandler.SyncComponents)
-			syncAPI.POST("/pricelists", syncHandler.SyncPricelists)
-			syncAPI.POST("/all", syncHandler.SyncAll)
-			syncAPI.POST("/push", syncHandler.PushPendingChanges)
-			syncAPI.GET("/pending/count", syncHandler.GetPendingCount)
-			syncAPI.GET("/pending", syncHandler.GetPendingChanges)
-		}
-	}
-
-	return router, syncService, nil
-}
-
-// restartProcess restarts the current process with the same arguments
-func restartProcess() {
-	executable, err := os.Executable()
-	if err != nil {
-		slog.Error("failed to get executable path", "error", err)
-		os.Exit(1)
-	}
-
-	args := os.Args
-	env := os.Environ()
-
-	slog.Info("executing restart", "executable", executable, "args", args)
-
-	err = syscall.Exec(executable, args, env)
-	if err != nil {
-		slog.Error("failed to restart process", "error", err)
-		os.Exit(1)
-	}
-}
-
-func requestLogger() gin.HandlerFunc {
-	return func(c *gin.Context) {
-		start := time.Now()
-		path := c.Request.URL.Path
-		query := c.Request.URL.RawQuery
-
-		c.Next()
-
-		latency := time.Since(start)
-		status := c.Writer.Status()
-
-		slog.Info("request",
-			"method", c.Request.Method,
-			"path", path,
-			"query", query,
-			"status", status,
-			"latency", latency,
-			"ip", c.ClientIP(),
-		)
-	}
-}

config.example.yaml

@@ -2,7 +2,7 @@
 # Copy this file to config.yaml and update values
 
 server:
-  host: "0.0.0.0"
+  host: "127.0.0.1"  # Use 0.0.0.0 to listen on all interfaces
   port: 8080
   mode: "release"  # debug | release
   read_timeout: "30s"

crontab

@@ -1,15 +0,0 @@
-# Cron jobs for QuoteForge
-# Run alerts check every hour
-0 * * * * /app/quoteforge-cron -job=alerts
-
-# Run price updates daily at 2 AM
-0 2 * * * /app/quoteforge-cron -job=update-prices
-
-# Reset weekly counters every Sunday at 1 AM
-0 1 * * 0 /app/quoteforge-cron -job=reset-counters
-
-# Update popularity scores daily at 3 AM
-0 3 * * * /app/quoteforge-cron -job=update-popularity
-
-# Log rotation (optional)
-# 0 0 * * * /usr/bin/logrotate /etc/logrotate.conf

csv_export.md

@@ -0,0 +1,297 @@
+# CSV Export Pattern (Go + GORM)
+
+## Архитектура (3-слойная)
+
+### 1. Handler Layer (HTTP)
+**Задачи**: Обработка HTTP-запроса, установка заголовков, инициация экспорта
+
+```go
+func (h *PricelistHandler) ExportCSV(c *gin.Context) {
+    // 1. Валидация параметров
+    id, err := strconv.ParseUint(c.Param("id"), 10, 32)
+
+    // 2. Получение метаданных для формирования имени файла
+    pl, err := h.service.GetByID(uint(id))
+
+    // 3. Установка HTTP-заголовков для скачивания
+    filename := fmt.Sprintf("pricelist_%s.csv", pl.Version)
+    c.Header("Content-Type", "text/csv; charset=utf-8")
+    c.Header("Content-Disposition", fmt.Sprintf("attachment; filename=\"%s\"", filename))
+
+    // 4. UTF-8 BOM для Excel-совместимости
+    c.Writer.Write([]byte{0xEF, 0xBB, 0xBF})
+
+    // 5. Настройка CSV writer
+    writer := csv.NewWriter(c.Writer)
+    writer.Comma = ';'  // Точка с запятой для Excel
+    defer writer.Flush()
+
+    // 6. Динамические заголовки (зависят от типа данных)
+    isWarehouse := strings.ToLower(pl.Source) == "warehouse"
+    var header []string
+    if isWarehouse {
+        header = []string{"Артикул", "Категория", "Описание", "Доступно", "Partnumbers", "Цена, $", "Настройки"}
+    } else {
+        header = []string{"Артикул", "Категория", "Описание", "Цена, $", "Настройки"}
+    }
+    writer.Write(header)
+
+    // 7. Streaming в batches через callback
+    err = h.service.StreamItemsForExport(uint(id), 500, func(items []models.PricelistItem) error {
+        for _, item := range items {
+            row := buildRow(item, isWarehouse)
+            if err := writer.Write(row); err != nil {
+                return err
+            }
+        }
+        writer.Flush()  // Flush после каждого batch
+        return nil
+    })
+}
+```
+
+### 2. Service Layer
+**Задачи**: Оркестрация, делегирование в репозиторий
+
+```go
+func (s *Service) StreamItemsForExport(pricelistID uint, batchSize int, callback func(items []models.PricelistItem) error) error {
+    if s.repo == nil {
+        return fmt.Errorf("offline mode: cannot stream pricelist items")
+    }
+    return s.repo.StreamItemsForExport(pricelistID, batchSize, callback)
+}
+```
+
+### 3. Repository Layer (Критичный)
+**Задачи**: Batch-загрузка из БД, оптимизация запросов, enrichment
+
+```go
+func (r *PricelistRepository) StreamItemsForExport(pricelistID uint, batchSize int, callback func(items []models.PricelistItem) error) error {
+    if batchSize <= 0 {
+        batchSize = 500  // Default batch size
+    }
+
+    // Проверка типа pricelist для conditional enrichment
+    var pl models.Pricelist
+    isWarehouse := false
+    if err := r.db.Select("source").Where("id = ?", pricelistID).First(&pl).Error; err == nil {
+        isWarehouse = pl.Source == string(models.PricelistSourceWarehouse)
+    }
+
+    offset := 0
+    for {
+        var items []models.PricelistItem
+
+        // ⚡ КЛЮЧЕВОЙ МОМЕНТ: JOIN для избежания N+1 запросов
+        err := r.db.Table("qt_pricelist_items AS pi").
+            Select("pi.*, COALESCE(l.lot_description, '') AS lot_description, COALESCE(l.lot_category, '') AS category").
+            Joins("LEFT JOIN lot AS l ON l.lot_name = pi.lot_name").
+            Where("pi.pricelist_id = ?", pricelistID).
+            Order("pi.lot_name").
+            Offset(offset).
+            Limit(batchSize).
+            Scan(&items).Error
+
+        if err != nil || len(items) == 0 {
+            break
+        }
+
+        // Conditional enrichment для warehouse данных
+        if isWarehouse {
+            r.enrichWarehouseItems(items)  // Добавление qty, partnumbers
+        }
+
+        // Вызов callback для обработки batch
+        if err := callback(items); err != nil {
+            return err
+        }
+
+        if len(items) < batchSize {
+            break  // Последний batch
+        }
+
+        offset += batchSize
+    }
+
+    return nil
+}
+```
+
+## Ключевые паттерны
+
+### 1. Streaming (не загружать все в память)
+```go
+// ❌ НЕ ТАК:
+var allItems []Item
+db.Find(&allItems)  // Может упасть на миллионах записей
+
+// ✅ ТАК:
+for offset := 0; ; offset += batchSize {
+    var batch []Item
+    db.Offset(offset).Limit(batchSize).Find(&batch)
+    processBatch(batch)
+    if len(batch) < batchSize {
+        break
+    }
+}
+```
+
+### 2. Callback Pattern для гибкости
+```go
+// Service не знает о CSV - может использоваться для любого экспорта
+func StreamItems(callback func([]Item) error) error
+```
+
+### 3. JOIN для избежания N+1
+```go
+// ❌ N+1 problem:
+items := getItems()
+for _, item := range items {
+    description := getLotDescription(item.LotName)  // N запросов
+}
+
+// ✅ JOIN:
+db.Table("items AS i").
+    Select("i.*, COALESCE(l.description, '') AS description").
+    Joins("LEFT JOIN lots AS l ON l.name = i.lot_name")
+```
+
+### 4. UTF-8 BOM для Excel
+```go
+// Excel на Windows требует BOM для корректного отображения UTF-8
+c.Writer.Write([]byte{0xEF, 0xBB, 0xBF})
+```
+
+### 5. Точка с запятой для Excel
+```go
+writer := csv.NewWriter(c.Writer)
+writer.Comma = ';'  // Excel в русской локали использует ;
+```
+
+### 6. Graceful Error Handling
+```go
+// После начала streaming нельзя вернуть JSON
+if err != nil {
+    // Уже начали писать CSV, поэтому пишем текст
+    c.String(http.StatusInternalServerError, "Export failed: %v", err)
+    return
+}
+```
+
+## Conditional Enrichment Pattern
+
+```go
+// Для warehouse прайслистов добавляем дополнительные поля
+func (r *PricelistRepository) enrichWarehouseItems(items []models.PricelistItem) error {
+    // 1. Собрать уникальные lot_names
+    lots := make([]string, 0, len(items))
+    seen := make(map[string]struct{})
+    for _, item := range items {
+        if _, ok := seen[item.LotName]; !ok {
+            lots = append(lots, item.LotName)
+            seen[item.LotName] = struct{}{}
+        }
+    }
+
+    // 2. Batch-загрузка метрик (qty, partnumbers)
+    qtyByLot, partnumbersByLot, err := warehouse.LoadLotMetrics(r.db, lots, true)
+
+    // 3. Обогащение items
+    for i := range items {
+        if qty, ok := qtyByLot[items[i].LotName]; ok {
+            items[i].AvailableQty = &qty
+        }
+        items[i].Partnumbers = partnumbersByLot[items[i].LotName]
+    }
+
+    return nil
+}
+```
+
+## Virtual Fields Pattern
+
+```go
+type PricelistItem struct {
+    // Stored fields
+    ID       uint    `gorm:"primaryKey"`
+    LotName  string  `gorm:"size:255"`
+    Price    float64 `gorm:"type:decimal(12,2)"`
+
+    // Virtual fields (populated via JOIN or programmatically)
+    LotDescription string   `gorm:"-:migration" json:"lot_description,omitempty"`
+    Category       string   `gorm:"-:migration" json:"category,omitempty"`
+    AvailableQty   *float64 `gorm:"-" json:"available_qty,omitempty"`
+    Partnumbers    []string `gorm:"-" json:"partnumbers,omitempty"`
+}
+```
+- `gorm:"-:migration"` - не создавать колонку в БД, но маппить при SELECT
+- `gorm:"-"` - полностью игнорировать при БД операциях
+
+## Checklist для CSV Export
+
+- [ ] HTTP заголовки: Content-Type, Content-Disposition
+- [ ] UTF-8 BOM для Excel (0xEF, 0xBB, 0xBF)
+- [ ] Разделитель (`;` для русской локали Excel)
+- [ ] Streaming с batch processing (не загружать всё в память)
+- [ ] JOIN для избежания N+1 запросов
+- [ ] Flush после каждого batch
+- [ ] Graceful error handling (нельзя JSON после начала streaming)
+- [ ] Динамические заголовки (если нужно)
+- [ ] Conditional enrichment (если данные зависят от типа)
+
+## Когда использовать этот паттерн
+
+✅ **Используй когда:**
+- Экспорт больших датасетов (>1000 записей)
+- Нужна Excel-совместимость
+- Связанные данные из нескольких таблиц
+- Conditional логика enrichment
+
+❌ **Не нужен когда:**
+- Малые датасеты (<100 записей) - можно загрузить всё сразу
+- Экспорт JSON/XML - другие подходы
+- Нет связанных данных - можно упростить
+
+## Пример роутинга (Gin)
+
+```go
+// В файле роутера
+func SetupRoutes(router *gin.Engine, handler *PricelistHandler) {
+    api := router.Group("/api")
+    {
+        pricelists := api.Group("/pricelists")
+        {
+            pricelists.GET("/:id/export", handler.ExportCSV)
+        }
+    }
+}
+```
+
+## Импорты
+
+```go
+import (
+    "encoding/csv"
+    "fmt"
+    "strconv"
+    "strings"
+
+    "github.com/gin-gonic/gin"
+    "gorm.io/gorm"
+)
+```
+
+## Performance Notes
+
+1. **Batch Size**: 500-1000 оптимально для большинства случаев
+2. **JOIN vs N+1**: JOIN на порядки быстрее при >100 записях
+3. **Memory**: Streaming позволяет экспортировать миллионы записей с минимальной памятью
+4. **Indexes**: Убедись что есть индексы на JOIN колонках
+
+## Источник
+
+Реализовано в проекте PriceForge:
+- Handler: `internal/handlers/pricelist.go:245-346`
+- Service: `internal/services/pricelist/service.go:373-379`
+- Repository: `internal/repository/pricelist.go:475-533`
+- Models: `internal/models/pricelist.go`

internal/appmeta/version.go

@@ -0,0 +1,26 @@
+package appmeta
+
+import "sync/atomic"
+
+var appVersion atomic.Value
+
+func init() {
+	appVersion.Store("dev")
+}
+
+// SetVersion configures the running application version string.
+func SetVersion(v string) {
+	if v == "" {
+		v = "dev"
+	}
+	appVersion.Store(v)
+}
+
+// Version returns the running application version string.
+func Version() string {
+	if v, ok := appVersion.Load().(string); ok && v != "" {
+		return v
+	}
+	return "dev"
+}
+

internal/appstate/path.go

@@ -0,0 +1,217 @@
+package appstate
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"runtime"
+	"strings"
+)
+
+const (
+	appDirName  = "QuoteForge"
+	defaultDB   = "qfs.db"
+	defaultCfg  = "config.yaml"
+	envDBPath   = "QFS_DB_PATH"
+	envStateDir = "QFS_STATE_DIR"
+	envCfgPath  = "QFS_CONFIG_PATH"
+)
+
+// ResolveDBPath returns the local SQLite path using priority:
+// explicit CLI path > QFS_DB_PATH > OS-specific user state directory.
+func ResolveDBPath(explicitPath string) (string, error) {
+	if explicitPath != "" {
+		return filepath.Clean(explicitPath), nil
+	}
+
+	if fromEnv := os.Getenv(envDBPath); fromEnv != "" {
+		return filepath.Clean(fromEnv), nil
+	}
+
+	dir, err := defaultStateDir()
+	if err != nil {
+		return "", err
+	}
+
+	return filepath.Join(dir, defaultDB), nil
+}
+
+// ResolveConfigPath returns the config path using priority:
+// explicit CLI path > QFS_CONFIG_PATH > OS-specific user state directory.
+func ResolveConfigPath(explicitPath string) (string, error) {
+	if explicitPath != "" {
+		return filepath.Clean(explicitPath), nil
+	}
+
+	if fromEnv := os.Getenv(envCfgPath); fromEnv != "" {
+		return filepath.Clean(fromEnv), nil
+	}
+
+	dir, err := defaultStateDir()
+	if err != nil {
+		return "", err
+	}
+
+	return filepath.Join(dir, defaultCfg), nil
+}
+
+// ResolveConfigPathNearDB returns config path using priority:
+// explicit CLI path > QFS_CONFIG_PATH > directory of resolved local DB path.
+// Falls back to ResolveConfigPath when dbPath is empty.
+func ResolveConfigPathNearDB(explicitPath, dbPath string) (string, error) {
+	if explicitPath != "" {
+		return filepath.Clean(explicitPath), nil
+	}
+
+	if fromEnv := os.Getenv(envCfgPath); fromEnv != "" {
+		return filepath.Clean(fromEnv), nil
+	}
+
+	if strings.TrimSpace(dbPath) != "" {
+		return filepath.Join(filepath.Dir(filepath.Clean(dbPath)), defaultCfg), nil
+	}
+
+	return ResolveConfigPath("")
+}
+
+// MigrateLegacyDB copies an existing legacy DB (and optional SQLite sidecars)
+// to targetPath if targetPath does not already exist.
+// Returns source path if migration happened.
+func MigrateLegacyDB(targetPath string, legacyPaths []string) (string, error) {
+	if targetPath == "" {
+		return "", nil
+	}
+
+	if exists(targetPath) {
+		return "", nil
+	}
+
+	if err := os.MkdirAll(filepath.Dir(targetPath), 0755); err != nil {
+		return "", fmt.Errorf("creating target db directory: %w", err)
+	}
+
+	for _, src := range legacyPaths {
+		if src == "" {
+			continue
+		}
+		src = filepath.Clean(src)
+		if src == targetPath || !exists(src) {
+			continue
+		}
+
+		if err := copyFile(src, targetPath); err != nil {
+			return "", fmt.Errorf("migrating legacy db from %s: %w", src, err)
+		}
+
+		// Optional SQLite sidecar files.
+		_ = copyIfExists(src+"-wal", targetPath+"-wal")
+		_ = copyIfExists(src+"-shm", targetPath+"-shm")
+
+		return src, nil
+	}
+
+	return "", nil
+}
+
+// MigrateLegacyFile copies an existing legacy file to targetPath
+// if targetPath does not already exist.
+func MigrateLegacyFile(targetPath string, legacyPaths []string) (string, error) {
+	if targetPath == "" {
+		return "", nil
+	}
+
+	if exists(targetPath) {
+		return "", nil
+	}
+
+	if err := os.MkdirAll(filepath.Dir(targetPath), 0755); err != nil {
+		return "", fmt.Errorf("creating target directory: %w", err)
+	}
+
+	for _, src := range legacyPaths {
+		if src == "" {
+			continue
+		}
+		src = filepath.Clean(src)
+		if src == targetPath || !exists(src) {
+			continue
+		}
+		if err := copyFile(src, targetPath); err != nil {
+			return "", fmt.Errorf("migrating legacy file from %s: %w", src, err)
+		}
+		return src, nil
+	}
+
+	return "", nil
+}
+
+func defaultStateDir() (string, error) {
+	if override := os.Getenv(envStateDir); override != "" {
+		return filepath.Clean(override), nil
+	}
+
+	switch runtime.GOOS {
+	case "darwin":
+		base, err := os.UserConfigDir() // ~/Library/Application Support
+		if err != nil {
+			return "", fmt.Errorf("resolving user config dir: %w", err)
+		}
+		return filepath.Join(base, appDirName), nil
+	case "windows":
+		if local := os.Getenv("LOCALAPPDATA"); local != "" {
+			return filepath.Join(local, appDirName), nil
+		}
+		base, err := os.UserConfigDir()
+		if err != nil {
+			return "", fmt.Errorf("resolving user config dir: %w", err)
+		}
+		return filepath.Join(base, appDirName), nil
+	default:
+		if xdgState := os.Getenv("XDG_STATE_HOME"); xdgState != "" {
+			return filepath.Join(xdgState, "quoteforge"), nil
+		}
+		home, err := os.UserHomeDir()
+		if err != nil {
+			return "", fmt.Errorf("resolving user home dir: %w", err)
+		}
+		return filepath.Join(home, ".local", "state", "quoteforge"), nil
+	}
+}
+
+func exists(path string) bool {
+	_, err := os.Stat(path)
+	return err == nil
+}
+
+func copyIfExists(src, dst string) error {
+	if !exists(src) {
+		return nil
+	}
+	return copyFile(src, dst)
+}
+
+func copyFile(src, dst string) error {
+	in, err := os.Open(src)
+	if err != nil {
+		return err
+	}
+	defer in.Close()
+
+	info, err := in.Stat()
+	if err != nil {
+		return err
+	}
+
+	out, err := os.OpenFile(dst, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, info.Mode().Perm())
+	if err != nil {
+		return err
+	}
+	defer out.Close()
+
+	if _, err := io.Copy(out, in); err != nil {
+		return err
+	}
+
+	return out.Sync()
+}

internal/config/config.go

@@ -2,9 +2,12 @@ package config
 
 import (
 	"fmt"
+	"net"
 	"os"
+	"strconv"
 	"time"
 
+	mysqlDriver "github.com/go-sql-driver/mysql"
 	"gopkg.in/yaml.v3"
 )
 
@@ -39,8 +42,18 @@ type DatabaseConfig struct {
 }
 
 func (d *DatabaseConfig) DSN() string {
-	return fmt.Sprintf("%s:%s@tcp(%s:%d)/%s?charset=utf8mb4&parseTime=True&loc=Local",
-		d.User, d.Password, d.Host, d.Port, d.Name)
+	cfg := mysqlDriver.NewConfig()
+	cfg.User = d.User
+	cfg.Passwd = d.Password
+	cfg.Net = "tcp"
+	cfg.Addr = net.JoinHostPort(d.Host, strconv.Itoa(d.Port))
+	cfg.DBName = d.Name
+	cfg.ParseTime = true
+	cfg.Loc = time.Local
+	cfg.Params = map[string]string{
+		"charset": "utf8mb4",
+	}
+	return cfg.FormatDSN()
 }
 
 type AuthConfig struct {
@@ -106,7 +119,7 @@ func Load(path string) (*Config, error) {
 
 func (c *Config) setDefaults() {
 	if c.Server.Host == "" {
-		c.Server.Host = "0.0.0.0"
+		c.Server.Host = "127.0.0.1"
 	}
 	if c.Server.Port == 0 {
 		c.Server.Port = 8080

internal/db/connection.go

@@ -32,14 +32,14 @@ type ConnectionStatus struct {
 
 // ConnectionManager manages database connections with thread-safety and connection pooling
 type ConnectionManager struct {
-	localDB    *localdb.LocalDB  // for getting DSN from settings
-	mu         sync.RWMutex      // protects db and state
-	db         *gorm.DB          // current connection (nil if not connected)
-	lastError  error             // last connection error
-	lastCheck  time.Time         // time of last check/attempt
-	connectTimeout    time.Duration  // timeout for connection (default: 5s)
-	pingInterval      time.Duration  // minimum interval between pings (default: 30s)
-	reconnectCooldown time.Duration  // pause after failed attempt (default: 10s)
+	localDB           *localdb.LocalDB // for getting DSN from settings
+	mu                sync.RWMutex     // protects db and state
+	db                *gorm.DB         // current connection (nil if not connected)
+	lastError         error            // last connection error
+	lastCheck         time.Time        // time of last check/attempt
+	connectTimeout    time.Duration    // timeout for connection (default: 5s)
+	pingInterval      time.Duration    // minimum interval between pings (default: 30s)
+	reconnectCooldown time.Duration    // pause after failed attempt (default: 10s)
 }
 
 // NewConnectionManager creates a new ConnectionManager instance
@@ -94,6 +94,8 @@ func (cm *ConnectionManager) GetDB() (*gorm.DB, error) {
 	// Attempt to connect
 	err := cm.connect()
 	if err != nil {
+		// Drop stale handle so callers don't treat it as an active connection.
+		cm.db = nil
 		cm.lastError = err
 		cm.lastCheck = time.Now()
 		return nil, err
@@ -147,23 +149,27 @@ func (cm *ConnectionManager) connect() error {
 	return nil
 }
 
-// IsOnline checks if the database is currently connected and responsive
-// Does not attempt to reconnect, only checks current state with caching
+// IsOnline checks if the database is currently connected and responsive.
+// If disconnected, it tries to reconnect (respecting cooldowns in GetDB).
 func (cm *ConnectionManager) IsOnline() bool {
 	cm.mu.RLock()
-	if cm.db == nil {
-		cm.mu.RUnlock()
-		return false
-	}
-
-	// If we've checked recently, return cached result
-	if time.Since(cm.lastCheck) < cm.pingInterval {
-		cm.mu.RUnlock()
-		return true
-	}
+	isDisconnected := cm.db == nil
+	lastErr := cm.lastError
+	checkedRecently := time.Since(cm.lastCheck) < cm.pingInterval
 	cm.mu.RUnlock()
 
-	// Need to perform actual ping
+	// Try reconnect in disconnected state.
+	if isDisconnected {
+		_, err := cm.GetDB()
+		return err == nil
+	}
+
+	// If we've checked recently, return cached result.
+	if checkedRecently {
+		return lastErr == nil
+	}
+
+	// Need to perform actual ping.
 	cm.mu.Lock()
 	defer cm.mu.Unlock()
 
@@ -282,7 +288,7 @@ func extractHostFromDSN(dsn string) string {
 		}
 		if parenEnd != -1 {
 			// Extract host:port part between tcp( and )
-			hostPort := dsn[tcpStart+1:parenEnd]
+			hostPort := dsn[tcpStart+1 : parenEnd]
 			return hostPort
 		}
 	}
@@ -317,7 +323,7 @@ func extractHostFromDSN(dsn string) string {
 			}
 
 			if parenEnd != -1 {
-				hostPort := dsn[parenStart+1:parenEnd]
+				hostPort := dsn[parenStart+1 : parenEnd]
 				return hostPort
 			}
 		}
@@ -325,4 +331,4 @@ func extractHostFromDSN(dsn string) string {
 
 	// If we can't parse it, return empty string
 	return ""
-}
+}

internal/handlers/component.go

@@ -3,8 +3,10 @@ package handlers
 import (
 	"net/http"
 	"strconv"
+	"strings"
 
 	"git.mchus.pro/mchus/quoteforge/internal/localdb"
+	"git.mchus.pro/mchus/quoteforge/internal/models"
 	"git.mchus.pro/mchus/quoteforge/internal/repository"
 	"git.mchus.pro/mchus/quoteforge/internal/services"
 	"github.com/gin-gonic/gin"
@@ -25,6 +27,12 @@ func NewComponentHandler(componentService *services.ComponentService, localDB *l
 func (h *ComponentHandler) List(c *gin.Context) {
 	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
 	perPage, _ := strconv.Atoi(c.DefaultQuery("per_page", "20"))
+	if page < 1 {
+		page = 1
+	}
+	if perPage < 1 {
+		perPage = 20
+	}
 
 	filter := repository.ComponentFilter{
 		Category:      c.Query("category"),
@@ -33,73 +41,68 @@ func (h *ComponentHandler) List(c *gin.Context) {
 		ExcludeHidden: c.Query("include_hidden") != "true", // По умолчанию скрытые не показываются
 	}
 
-	result, err := h.componentService.List(filter, page, perPage)
+	localFilter := localdb.ComponentFilter{
+		Category: filter.Category,
+		Search:   filter.Search,
+		HasPrice: filter.HasPrice,
+	}
+	offset := (page - 1) * perPage
+	localComps, total, err := h.localDB.ListComponents(localFilter, offset, perPage)
 	if err != nil {
 		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
 		return
 	}
 
-	// If offline mode (empty result), fallback to local components
-	isOffline := false
-	if v, ok := c.Get("is_offline"); ok {
-		if b, ok := v.(bool); ok {
-			isOffline = b
-		}
-	}
-	if isOffline && result.Total == 0 && h.localDB != nil {
-		localFilter := localdb.ComponentFilter{
-			Category: filter.Category,
-			Search:   filter.Search,
-			HasPrice: filter.HasPrice,
-		}
-
-		offset := (page - 1) * perPage
-		localComps, total, err := h.localDB.ListComponents(localFilter, offset, perPage)
-		if err == nil && len(localComps) > 0 {
-			// Convert local components to ComponentView format
-			components := make([]services.ComponentView, len(localComps))
-			for i, lc := range localComps {
-				components[i] = services.ComponentView{
-					LotName:      lc.LotName,
-					Description:  lc.LotDescription,
-					Category:     lc.Category,
-					CategoryName: lc.Category, // No translation in local mode
-					Model:        lc.Model,
-					CurrentPrice: lc.CurrentPrice,
-				}
-			}
-
-			c.JSON(http.StatusOK, &services.ComponentListResult{
-				Components: components,
-				Total:      total,
-				Page:       page,
-				PerPage:    perPage,
-			})
-			return
+	components := make([]services.ComponentView, len(localComps))
+	for i, lc := range localComps {
+		components[i] = services.ComponentView{
+			LotName:      lc.LotName,
+			Description:  lc.LotDescription,
+			Category:     lc.Category,
+			CategoryName: lc.Category,
+			Model:        lc.Model,
 		}
 	}
 
-	c.JSON(http.StatusOK, result)
+	c.JSON(http.StatusOK, &services.ComponentListResult{
+		Components: components,
+		Total:      total,
+		Page:       page,
+		PerPage:    perPage,
+	})
 }
 
 func (h *ComponentHandler) Get(c *gin.Context) {
 	lotName := c.Param("lot_name")
-
-	component, err := h.componentService.GetByLotName(lotName)
+	component, err := h.localDB.GetLocalComponent(lotName)
 	if err != nil {
 		c.JSON(http.StatusNotFound, gin.H{"error": "component not found"})
 		return
 	}
 
-	c.JSON(http.StatusOK, component)
+	c.JSON(http.StatusOK, services.ComponentView{
+		LotName:      component.LotName,
+		Description:  component.LotDescription,
+		Category:     component.Category,
+		CategoryName: component.Category,
+		Model:        component.Model,
+	})
 }
 
 func (h *ComponentHandler) GetCategories(c *gin.Context) {
-	categories, err := h.componentService.GetCategories()
-	if err != nil {
-		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+	codes, err := h.localDB.GetLocalComponentCategories()
+	if err == nil && len(codes) > 0 {
+		categories := make([]models.Category, 0, len(codes))
+		for _, code := range codes {
+			trimmed := strings.TrimSpace(code)
+			if trimmed == "" {
+				continue
+			}
+			categories = append(categories, models.Category{Code: trimmed, Name: trimmed})
+		}
+		c.JSON(http.StatusOK, categories)
 		return
 	}
 
-	c.JSON(http.StatusOK, categories)
+	c.JSON(http.StatusOK, models.DefaultCategories)
 }

internal/handlers/configuration.go

@@ -1,13 +1,12 @@
 package handlers
 
 import (
-
 	"net/http"
 	"strconv"
 
-	"github.com/gin-gonic/gin"
 	"git.mchus.pro/mchus/quoteforge/internal/middleware"
 	"git.mchus.pro/mchus/quoteforge/internal/services"
+	"github.com/gin-gonic/gin"
 )
 
 type ConfigurationHandler struct {
@@ -26,11 +25,11 @@ func NewConfigurationHandler(
 }
 
 func (h *ConfigurationHandler) List(c *gin.Context) {
-	userID := middleware.GetUserID(c)
+	username := middleware.GetUsername(c)
 	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
 	perPage, _ := strconv.Atoi(c.DefaultQuery("per_page", "20"))
 
-	configs, total, err := h.configService.ListByUser(userID, page, perPage)
+	configs, total, err := h.configService.ListByUser(username, page, perPage)
 	if err != nil {
 		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
 		return
@@ -45,7 +44,7 @@ func (h *ConfigurationHandler) List(c *gin.Context) {
 }
 
 func (h *ConfigurationHandler) Create(c *gin.Context) {
-	userID := middleware.GetUserID(c)
+	username := middleware.GetUsername(c)
 
 	var req services.CreateConfigRequest
 	if err := c.ShouldBindJSON(&req); err != nil {
@@ -53,7 +52,7 @@ func (h *ConfigurationHandler) Create(c *gin.Context) {
 		return
 	}
 
-	config, err := h.configService.Create(userID, &req)
+	config, err := h.configService.Create(username, &req)
 	if err != nil {
 		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
 		return
@@ -63,10 +62,10 @@ func (h *ConfigurationHandler) Create(c *gin.Context) {
 }
 
 func (h *ConfigurationHandler) Get(c *gin.Context) {
-	userID := middleware.GetUserID(c)
+	username := middleware.GetUsername(c)
 	uuid := c.Param("uuid")
 
-	config, err := h.configService.GetByUUID(uuid, userID)
+	config, err := h.configService.GetByUUID(uuid, username)
 	if err != nil {
 		status := http.StatusNotFound
 		if err == services.ErrConfigForbidden {
@@ -80,7 +79,7 @@ func (h *ConfigurationHandler) Get(c *gin.Context) {
 }
 
 func (h *ConfigurationHandler) Update(c *gin.Context) {
-	userID := middleware.GetUserID(c)
+	username := middleware.GetUsername(c)
 	uuid := c.Param("uuid")
 
 	var req services.CreateConfigRequest
@@ -89,7 +88,7 @@ func (h *ConfigurationHandler) Update(c *gin.Context) {
 		return
 	}
 
-	config, err := h.configService.Update(uuid, userID, &req)
+	config, err := h.configService.Update(uuid, username, &req)
 	if err != nil {
 		status := http.StatusInternalServerError
 		if err == services.ErrConfigNotFound {
@@ -105,10 +104,10 @@ func (h *ConfigurationHandler) Update(c *gin.Context) {
 }
 
 func (h *ConfigurationHandler) Delete(c *gin.Context) {
-	userID := middleware.GetUserID(c)
+	username := middleware.GetUsername(c)
 	uuid := c.Param("uuid")
 
-	err := h.configService.Delete(uuid, userID)
+	err := h.configService.Delete(uuid, username)
 	if err != nil {
 		status := http.StatusInternalServerError
 		if err == services.ErrConfigNotFound {
@@ -128,7 +127,7 @@ type RenameConfigRequest struct {
 }
 
 func (h *ConfigurationHandler) Rename(c *gin.Context) {
-	userID := middleware.GetUserID(c)
+	username := middleware.GetUsername(c)
 	uuid := c.Param("uuid")
 
 	var req RenameConfigRequest
@@ -137,7 +136,7 @@ func (h *ConfigurationHandler) Rename(c *gin.Context) {
 		return
 	}
 
-	config, err := h.configService.Rename(uuid, userID, req.Name)
+	config, err := h.configService.Rename(uuid, username, req.Name)
 	if err != nil {
 		status := http.StatusInternalServerError
 		if err == services.ErrConfigNotFound {
@@ -157,7 +156,7 @@ type CloneConfigRequest struct {
 }
 
 func (h *ConfigurationHandler) Clone(c *gin.Context) {
-	userID := middleware.GetUserID(c)
+	username := middleware.GetUsername(c)
 	uuid := c.Param("uuid")
 
 	var req CloneConfigRequest
@@ -166,7 +165,7 @@ func (h *ConfigurationHandler) Clone(c *gin.Context) {
 		return
 	}
 
-	config, err := h.configService.Clone(uuid, userID, req.Name)
+	config, err := h.configService.Clone(uuid, username, req.Name)
 	if err != nil {
 		status := http.StatusInternalServerError
 		if err == services.ErrConfigNotFound {
@@ -182,10 +181,10 @@ func (h *ConfigurationHandler) Clone(c *gin.Context) {
 }
 
 func (h *ConfigurationHandler) RefreshPrices(c *gin.Context) {
-	userID := middleware.GetUserID(c)
+	username := middleware.GetUsername(c)
 	uuid := c.Param("uuid")
 
-	config, err := h.configService.RefreshPrices(uuid, userID)
+	config, err := h.configService.RefreshPrices(uuid, username)
 	if err != nil {
 		status := http.StatusInternalServerError
 		if err == services.ErrConfigNotFound {

internal/handlers/export.go

@@ -5,32 +5,37 @@ import (
 	"net/http"
 	"time"
 
-	"github.com/gin-gonic/gin"
 	"git.mchus.pro/mchus/quoteforge/internal/middleware"
 	"git.mchus.pro/mchus/quoteforge/internal/services"
+	"github.com/gin-gonic/gin"
 )
 
 type ExportHandler struct {
 	exportService    *services.ExportService
 	configService    services.ConfigurationGetter
 	componentService *services.ComponentService
+	projectService   *services.ProjectService
 }
 
 func NewExportHandler(
 	exportService *services.ExportService,
 	configService services.ConfigurationGetter,
 	componentService *services.ComponentService,
+	projectService *services.ProjectService,
 ) *ExportHandler {
 	return &ExportHandler{
 		exportService:    exportService,
 		configService:    configService,
 		componentService: componentService,
+		projectService:   projectService,
 	}
 }
 
 type ExportRequest struct {
-	Name  string `json:"name" binding:"required"`
-	Items []struct {
+	Name         string `json:"name" binding:"required"`
+	ProjectName  string `json:"project_name"`
+	ProjectUUID  string `json:"project_uuid"`
+	Items        []struct {
 		LotName   string  `json:"lot_name" binding:"required"`
 		Quantity  int     `json:"quantity" binding:"required,min=1"`
 		UnitPrice float64 `json:"unit_price"`
@@ -47,15 +52,36 @@ func (h *ExportHandler) ExportCSV(c *gin.Context) {
 
 	data := h.buildExportData(&req)
 
-	csvData, err := h.exportService.ToCSV(data)
-	if err != nil {
-		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+	// Validate before streaming (can return JSON error)
+	if len(data.Items) == 0 {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "no items to export"})
 		return
 	}
 
-	filename := fmt.Sprintf("%s %s SPEC.csv", time.Now().Format("2006-01-02"), req.Name)
+	// Get project name if available
+	projectName := req.ProjectName
+	if projectName == "" && req.ProjectUUID != "" {
+		// Try to load project name from database
+		username := middleware.GetUsername(c)
+		if project, err := h.projectService.GetByUUID(req.ProjectUUID, username); err == nil && project != nil {
+			projectName = project.Name
+		}
+	}
+	if projectName == "" {
+		projectName = req.Name
+	}
+
+	// Set headers before streaming
+	exportDate := data.CreatedAt
+	filename := fmt.Sprintf("%s (%s) %s BOM.csv", exportDate.Format("2006-01-02"), projectName, req.Name)
+	c.Header("Content-Type", "text/csv; charset=utf-8")
 	c.Header("Content-Disposition", fmt.Sprintf("attachment; filename=\"%s\"", filename))
-	c.Data(http.StatusOK, "text/csv; charset=utf-8", csvData)
+
+	// Stream CSV (cannot return JSON after this point)
+	if err := h.exportService.ToCSV(c.Writer, data); err != nil {
+		c.Error(err) // Log only
+		return
+	}
 }
 
 func (h *ExportHandler) buildExportData(req *ExportRequest) *services.ExportData {
@@ -98,10 +124,11 @@ func (h *ExportHandler) buildExportData(req *ExportRequest) *services.ExportData
 }
 
 func (h *ExportHandler) ExportConfigCSV(c *gin.Context) {
-	userID := middleware.GetUserID(c)
+	username := middleware.GetUsername(c)
 	uuid := c.Param("uuid")
 
-	config, err := h.configService.GetByUUID(uuid, userID)
+	// Get config before streaming (can return JSON error)
+	config, err := h.configService.GetByUUID(uuid, username)
 	if err != nil {
 		c.JSON(http.StatusNotFound, gin.H{"error": err.Error()})
 		return
@@ -109,13 +136,33 @@ func (h *ExportHandler) ExportConfigCSV(c *gin.Context) {
 
 	data := h.exportService.ConfigToExportData(config, h.componentService)
 
-	csvData, err := h.exportService.ToCSV(data)
-	if err != nil {
-		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+	// Validate before streaming (can return JSON error)
+	if len(data.Items) == 0 {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "no items to export"})
 		return
 	}
 
-	filename := fmt.Sprintf("%s %s SPEC.csv", config.CreatedAt.Format("2006-01-02"), config.Name)
+	// Get project name if configuration belongs to a project
+	projectName := config.Name // fallback: use config name if no project
+	if config.ProjectUUID != nil && *config.ProjectUUID != "" {
+		if project, err := h.projectService.GetByUUID(*config.ProjectUUID, username); err == nil && project != nil {
+			projectName = project.Name
+		}
+	}
+
+	// Set headers before streaming
+	// Use price update time if available, otherwise creation time
+	exportDate := config.CreatedAt
+	if config.PriceUpdatedAt != nil {
+		exportDate = *config.PriceUpdatedAt
+	}
+	filename := fmt.Sprintf("%s (%s) %s BOM.csv", exportDate.Format("2006-01-02"), projectName, config.Name)
+	c.Header("Content-Type", "text/csv; charset=utf-8")
 	c.Header("Content-Disposition", fmt.Sprintf("attachment; filename=\"%s\"", filename))
-	c.Data(http.StatusOK, "text/csv; charset=utf-8", csvData)
+
+	// Stream CSV (cannot return JSON after this point)
+	if err := h.exportService.ToCSV(c.Writer, data); err != nil {
+		c.Error(err) // Log only
+		return
+	}
 }

internal/handlers/export_test.go

@@ -0,0 +1,314 @@
+package handlers
+
+import (
+	"bytes"
+	"encoding/csv"
+	"encoding/json"
+	"errors"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+	"time"
+
+	"git.mchus.pro/mchus/quoteforge/internal/config"
+	"git.mchus.pro/mchus/quoteforge/internal/models"
+	"git.mchus.pro/mchus/quoteforge/internal/services"
+	"github.com/gin-gonic/gin"
+)
+
+// Mock services for testing
+type mockConfigService struct {
+	config *models.Configuration
+	err    error
+}
+
+func (m *mockConfigService) GetByUUID(uuid string, ownerUsername string) (*models.Configuration, error) {
+	return m.config, m.err
+}
+
+
+func TestExportCSV_Success(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+
+	// Create a basic mock component service that doesn't panic
+	mockComponentService := &services.ComponentService{}
+
+	// Create handler with mocks
+	exportSvc := services.NewExportService(config.ExportConfig{}, nil)
+	handler := NewExportHandler(
+		exportSvc,
+		&mockConfigService{},
+		mockComponentService,
+		nil,
+	)
+
+	// Create JSON request body
+	jsonBody := `{
+		"name": "Test Export",
+		"items": [
+			{
+				"lot_name": "LOT-001",
+				"quantity": 2,
+				"unit_price": 100.50
+			}
+		],
+		"notes": "Test notes"
+	}`
+
+	// Create HTTP request
+	req, _ := http.NewRequest("POST", "/api/export/csv", bytes.NewBufferString(jsonBody))
+	req.Header.Set("Content-Type", "application/json")
+
+	// Create response recorder
+	w := httptest.NewRecorder()
+
+	// Create Gin context
+	c, _ := gin.CreateTestContext(w)
+	c.Request = req
+
+	// Call handler
+	handler.ExportCSV(c)
+
+	// Check status code
+	if w.Code != http.StatusOK {
+		t.Errorf("Expected status 200, got %d", w.Code)
+	}
+
+	// Check Content-Type header
+	contentType := w.Header().Get("Content-Type")
+	if contentType != "text/csv; charset=utf-8" {
+		t.Errorf("Expected Content-Type 'text/csv; charset=utf-8', got %q", contentType)
+	}
+
+	// Check for BOM
+	responseBody := w.Body.Bytes()
+	if len(responseBody) < 3 {
+		t.Fatalf("Response too short to contain BOM")
+	}
+
+	expectedBOM := []byte{0xEF, 0xBB, 0xBF}
+	actualBOM := responseBody[:3]
+	if bytes.Compare(actualBOM, expectedBOM) != 0 {
+		t.Errorf("UTF-8 BOM mismatch. Expected %v, got %v", expectedBOM, actualBOM)
+	}
+
+	// Check semicolon delimiter in CSV
+	reader := csv.NewReader(bytes.NewReader(responseBody[3:]))
+	reader.Comma = ';'
+
+	header, err := reader.Read()
+	if err != nil {
+		t.Errorf("Failed to parse CSV header: %v", err)
+	}
+
+	if len(header) != 6 {
+		t.Errorf("Expected 6 columns, got %d", len(header))
+	}
+}
+
+func TestExportCSV_InvalidRequest(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+
+	exportSvc := services.NewExportService(config.ExportConfig{}, nil)
+	handler := NewExportHandler(
+		exportSvc,
+		&mockConfigService{},
+		&services.ComponentService{},
+		nil,
+	)
+
+	// Create invalid request (missing required field)
+	req, _ := http.NewRequest("POST", "/api/export/csv", bytes.NewBufferString(`{"name": "Test"}`))
+	req.Header.Set("Content-Type", "application/json")
+
+	w := httptest.NewRecorder()
+	c, _ := gin.CreateTestContext(w)
+	c.Request = req
+
+	handler.ExportCSV(c)
+
+	// Should return 400 Bad Request
+	if w.Code != http.StatusBadRequest {
+		t.Errorf("Expected status 400, got %d", w.Code)
+	}
+
+	// Should return JSON error
+	var errResp map[string]interface{}
+	json.Unmarshal(w.Body.Bytes(), &errResp)
+	if _, hasError := errResp["error"]; !hasError {
+		t.Errorf("Expected error in JSON response")
+	}
+}
+
+func TestExportCSV_EmptyItems(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+
+	exportSvc := services.NewExportService(config.ExportConfig{}, nil)
+	handler := NewExportHandler(
+		exportSvc,
+		&mockConfigService{},
+		&services.ComponentService{},
+		nil,
+	)
+
+	// Create request with empty items array - should fail binding validation
+	req, _ := http.NewRequest("POST", "/api/export/csv", bytes.NewBufferString(`{"name":"Empty Export","items":[],"notes":""}`))
+	req.Header.Set("Content-Type", "application/json")
+
+	w := httptest.NewRecorder()
+	c, _ := gin.CreateTestContext(w)
+	c.Request = req
+
+	handler.ExportCSV(c)
+
+	// Should return 400 Bad Request (validation error from gin binding)
+	if w.Code != http.StatusBadRequest {
+		t.Logf("Status code: %d (expected 400 for empty items)", w.Code)
+	}
+}
+
+func TestExportConfigCSV_Success(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+
+	// Mock configuration
+	mockConfig := &models.Configuration{
+		UUID:          "test-uuid",
+		Name:          "Test Config",
+		OwnerUsername: "testuser",
+		Items: models.ConfigItems{
+			{
+				LotName:   "LOT-001",
+				Quantity:  1,
+				UnitPrice: 100.0,
+			},
+		},
+		CreatedAt: time.Now(),
+	}
+
+	exportSvc := services.NewExportService(config.ExportConfig{}, nil)
+	handler := NewExportHandler(
+		exportSvc,
+		&mockConfigService{config: mockConfig},
+		&services.ComponentService{},
+		nil,
+	)
+
+	// Create HTTP request
+	req, _ := http.NewRequest("GET", "/api/configs/test-uuid/export", nil)
+	w := httptest.NewRecorder()
+
+	c, _ := gin.CreateTestContext(w)
+	c.Request = req
+	c.Params = gin.Params{
+		{Key: "uuid", Value: "test-uuid"},
+	}
+
+	// Mock middleware.GetUsername
+	c.Set("username", "testuser")
+
+	handler.ExportConfigCSV(c)
+
+	// Check status code
+	if w.Code != http.StatusOK {
+		t.Errorf("Expected status 200, got %d", w.Code)
+	}
+
+	// Check Content-Type header
+	contentType := w.Header().Get("Content-Type")
+	if contentType != "text/csv; charset=utf-8" {
+		t.Errorf("Expected Content-Type 'text/csv; charset=utf-8', got %q", contentType)
+	}
+
+	// Check for BOM
+	responseBody := w.Body.Bytes()
+	if len(responseBody) < 3 {
+		t.Fatalf("Response too short to contain BOM")
+	}
+
+	expectedBOM := []byte{0xEF, 0xBB, 0xBF}
+	actualBOM := responseBody[:3]
+	if bytes.Compare(actualBOM, expectedBOM) != 0 {
+		t.Errorf("UTF-8 BOM mismatch")
+	}
+}
+
+func TestExportConfigCSV_NotFound(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+
+	exportSvc := services.NewExportService(config.ExportConfig{}, nil)
+	handler := NewExportHandler(
+		exportSvc,
+		&mockConfigService{err: errors.New("config not found")},
+		&services.ComponentService{},
+		nil,
+	)
+
+	req, _ := http.NewRequest("GET", "/api/configs/nonexistent-uuid/export", nil)
+	w := httptest.NewRecorder()
+
+	c, _ := gin.CreateTestContext(w)
+	c.Request = req
+	c.Params = gin.Params{
+		{Key: "uuid", Value: "nonexistent-uuid"},
+	}
+	c.Set("username", "testuser")
+
+	handler.ExportConfigCSV(c)
+
+	// Should return 404 Not Found
+	if w.Code != http.StatusNotFound {
+		t.Errorf("Expected status 404, got %d", w.Code)
+	}
+
+	// Should return JSON error
+	var errResp map[string]interface{}
+	json.Unmarshal(w.Body.Bytes(), &errResp)
+	if _, hasError := errResp["error"]; !hasError {
+		t.Errorf("Expected error in JSON response")
+	}
+}
+
+func TestExportConfigCSV_EmptyItems(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+
+	// Mock configuration with empty items
+	mockConfig := &models.Configuration{
+		UUID:          "test-uuid",
+		Name:          "Empty Config",
+		OwnerUsername: "testuser",
+		Items:         models.ConfigItems{},
+		CreatedAt:     time.Now(),
+	}
+
+	exportSvc := services.NewExportService(config.ExportConfig{}, nil)
+	handler := NewExportHandler(
+		exportSvc,
+		&mockConfigService{config: mockConfig},
+		&services.ComponentService{},
+		nil,
+	)
+
+	req, _ := http.NewRequest("GET", "/api/configs/test-uuid/export", nil)
+	w := httptest.NewRecorder()
+
+	c, _ := gin.CreateTestContext(w)
+	c.Request = req
+	c.Params = gin.Params{
+		{Key: "uuid", Value: "test-uuid"},
+	}
+	c.Set("username", "testuser")
+
+	handler.ExportConfigCSV(c)
+
+	// Should return 400 Bad Request
+	if w.Code != http.StatusBadRequest {
+		t.Errorf("Expected status 400, got %d", w.Code)
+	}
+
+	// Should return JSON error
+	var errResp map[string]interface{}
+	json.Unmarshal(w.Body.Bytes(), &errResp)
+	if _, hasError := errResp["error"]; !hasError {
+		t.Errorf("Expected error in JSON response")
+	}
+}

internal/handlers/pricelist.go

@@ -2,72 +2,93 @@ package handlers
 
 import (
 	"net/http"
+	"sort"
 	"strconv"
+	"strings"
 
-	"github.com/gin-gonic/gin"
 	"git.mchus.pro/mchus/quoteforge/internal/localdb"
-	"git.mchus.pro/mchus/quoteforge/internal/services/pricelist"
+	"git.mchus.pro/mchus/quoteforge/internal/models"
+	"github.com/gin-gonic/gin"
 )
 
 type PricelistHandler struct {
-	service *pricelist.Service
 	localDB *localdb.LocalDB
 }
 
-func NewPricelistHandler(service *pricelist.Service, localDB *localdb.LocalDB) *PricelistHandler {
-	return &PricelistHandler{service: service, localDB: localDB}
+func NewPricelistHandler(localDB *localdb.LocalDB) *PricelistHandler {
+	return &PricelistHandler{localDB: localDB}
 }
 
-// List returns all pricelists with pagination
+// List returns all pricelists with pagination.
 func (h *PricelistHandler) List(c *gin.Context) {
 	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
 	perPage, _ := strconv.Atoi(c.DefaultQuery("per_page", "20"))
+	if page < 1 {
+		page = 1
+	}
+	if perPage < 1 {
+		perPage = 20
+	}
+	source := c.Query("source")
+	activeOnly := c.DefaultQuery("active_only", "false") == "true"
 
-	pricelists, total, err := h.service.List(page, perPage)
+	localPLs, err := h.localDB.GetLocalPricelists()
 	if err != nil {
 		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
 		return
 	}
-
-	// If offline (empty list), fallback to local pricelists
-	if total == 0 && h.localDB != nil {
-		localPLs, err := h.localDB.GetLocalPricelists()
-		if err == nil && len(localPLs) > 0 {
-			// Convert to PricelistSummary format
-			summaries := make([]map[string]interface{}, len(localPLs))
-			for i, lpl := range localPLs {
-				summaries[i] = map[string]interface{}{
-					"id":          lpl.ServerID,
-					"version":     lpl.Version,
-					"created_by":  "sync",
-					"item_count":  0, // Not tracked
-					"usage_count": 0, // Not tracked in local
-					"is_active":   true,
-					"created_at":  lpl.CreatedAt,
-					"synced_from": "local",
-				}
+	if source != "" {
+		filtered := localPLs[:0]
+		for _, lpl := range localPLs {
+			if strings.EqualFold(lpl.Source, source) {
+				filtered = append(filtered, lpl)
 			}
-
-			c.JSON(http.StatusOK, gin.H{
-				"pricelists": summaries,
-				"total":      len(summaries),
-				"page":       page,
-				"per_page":   perPage,
-				"offline":    true,
-			})
-			return
 		}
+		localPLs = filtered
+	}
+	if activeOnly {
+		// Local cache stores only active snapshots for normal operations.
+	}
+	sort.SliceStable(localPLs, func(i, j int) bool { return localPLs[i].CreatedAt.After(localPLs[j].CreatedAt) })
+	total := len(localPLs)
+	start := (page - 1) * perPage
+	if start > total {
+		start = total
+	}
+	end := start + perPage
+	if end > total {
+		end = total
+	}
+	pageSlice := localPLs[start:end]
+	summaries := make([]map[string]interface{}, 0, len(pageSlice))
+	for _, lpl := range pageSlice {
+		itemCount := h.localDB.CountLocalPricelistItems(lpl.ID)
+		usageCount := 0
+		if lpl.IsUsed {
+			usageCount = 1
+		}
+		summaries = append(summaries, map[string]interface{}{
+			"id":          lpl.ServerID,
+			"source":      lpl.Source,
+			"version":     lpl.Version,
+			"created_by":  "sync",
+			"item_count":  itemCount,
+			"usage_count": usageCount,
+			"is_active":   true,
+			"created_at":  lpl.CreatedAt,
+			"synced_from": "local",
+		})
 	}
 
 	c.JSON(http.StatusOK, gin.H{
-		"pricelists": pricelists,
+		"pricelists": summaries,
 		"total":      total,
 		"page":       page,
 		"per_page":   perPage,
 	})
 }
 
-// Get returns a single pricelist by ID
+// Get returns a single pricelist by ID.
 func (h *PricelistHandler) Get(c *gin.Context) {
 	idStr := c.Param("id")
 	id, err := strconv.ParseUint(idStr, 10, 32)
@@ -76,50 +97,25 @@ func (h *PricelistHandler) Get(c *gin.Context) {
 		return
 	}
 
-	pl, err := h.service.GetByID(uint(id))
+	localPL, err := h.localDB.GetLocalPricelistByServerID(uint(id))
 	if err != nil {
 		c.JSON(http.StatusNotFound, gin.H{"error": "pricelist not found"})
 		return
 	}
 
-	c.JSON(http.StatusOK, pl)
+	c.JSON(http.StatusOK, gin.H{
+		"id":          localPL.ServerID,
+		"source":      localPL.Source,
+		"version":     localPL.Version,
+		"created_by":  "sync",
+		"item_count":  h.localDB.CountLocalPricelistItems(localPL.ID),
+		"is_active":   true,
+		"created_at":  localPL.CreatedAt,
+		"synced_from": "local",
+	})
 }
 
-// Create creates a new pricelist from current prices
-func (h *PricelistHandler) Create(c *gin.Context) {
-	// Get the database username as the creator
-	createdBy := h.localDB.GetDBUser()
-	if createdBy == "" {
-		createdBy = "unknown"
-	}
-
-	pl, err := h.service.CreateFromCurrentPrices(createdBy)
-	if err != nil {
-		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
-		return
-	}
-
-	c.JSON(http.StatusCreated, pl)
-}
-
-// Delete deletes a pricelist by ID
-func (h *PricelistHandler) Delete(c *gin.Context) {
-	idStr := c.Param("id")
-	id, err := strconv.ParseUint(idStr, 10, 32)
-	if err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid pricelist ID"})
-		return
-	}
-
-	if err := h.service.Delete(uint(id)); err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
-		return
-	}
-
-	c.JSON(http.StatusOK, gin.H{"message": "pricelist deleted"})
-}
-
-// GetItems returns items for a pricelist with pagination
+// GetItems returns items for a pricelist with pagination.
 func (h *PricelistHandler) GetItems(c *gin.Context) {
 	idStr := c.Param("id")
 	id, err := strconv.ParseUint(idStr, 10, 32)
@@ -132,57 +128,106 @@ func (h *PricelistHandler) GetItems(c *gin.Context) {
 	perPage, _ := strconv.Atoi(c.DefaultQuery("per_page", "50"))
 	search := c.Query("search")
 
-	items, total, err := h.service.GetItems(uint(id), page, perPage, search)
+	localPL, err := h.localDB.GetLocalPricelistByServerID(uint(id))
 	if err != nil {
+		c.JSON(http.StatusNotFound, gin.H{"error": "pricelist not found"})
+		return
+	}
+	if page < 1 {
+		page = 1
+	}
+	if perPage < 1 {
+		perPage = 50
+	}
+	var items []localdb.LocalPricelistItem
+	dbq := h.localDB.DB().Model(&localdb.LocalPricelistItem{}).Where("pricelist_id = ?", localPL.ID)
+	if strings.TrimSpace(search) != "" {
+		dbq = dbq.Where("lot_name LIKE ?", "%"+strings.TrimSpace(search)+"%")
+	}
+	var total int64
+	if err := dbq.Count(&total).Error; err != nil {
 		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
 		return
 	}
+	offset := (page - 1) * perPage
+
+	if err := dbq.Order("lot_name").Offset(offset).Limit(perPage).Find(&items).Error; err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+	resultItems := make([]gin.H, 0, len(items))
+	for _, item := range items {
+		category := ""
+		if parts := strings.SplitN(item.LotName, "_", 2); len(parts) > 0 {
+			category = parts[0]
+		}
+		resultItems = append(resultItems, gin.H{
+			"id":            item.ID,
+			"lot_name":      item.LotName,
+			"price":         item.Price,
+			"category":      category,
+			"available_qty": item.AvailableQty,
+			"partnumbers":   []string(item.Partnumbers),
+		})
+	}
 
 	c.JSON(http.StatusOK, gin.H{
-		"items":    items,
+		"source":   localPL.Source,
+		"items":    resultItems,
 		"total":    total,
 		"page":     page,
 		"per_page": perPage,
 	})
 }
 
-// CanWrite returns whether the current user can create pricelists
-func (h *PricelistHandler) CanWrite(c *gin.Context) {
-	canWrite, debugInfo := h.service.CanWriteDebug()
-	c.JSON(http.StatusOK, gin.H{"can_write": canWrite, "debug": debugInfo})
-}
-
-// GetLatest returns the most recent active pricelist
-func (h *PricelistHandler) GetLatest(c *gin.Context) {
-	// Try to get from server first
-	pl, err := h.service.GetLatestActive()
+func (h *PricelistHandler) GetLotNames(c *gin.Context) {
+	idStr := c.Param("id")
+	id, err := strconv.ParseUint(idStr, 10, 32)
 	if err != nil {
-		// If offline or no server pricelists, try to get from local cache
-		if h.localDB == nil {
-			c.JSON(http.StatusNotFound, gin.H{"error": "no database available"})
-			return
-		}
-		localPL, localErr := h.localDB.GetLatestLocalPricelist()
-		if localErr != nil {
-			// No local pricelists either
-			c.JSON(http.StatusNotFound, gin.H{
-				"error":       "no pricelists available",
-				"local_error": localErr.Error(),
-			})
-			return
-		}
-		// Return local pricelist
-		c.JSON(http.StatusOK, gin.H{
-			"id":          localPL.ServerID,
-			"version":     localPL.Version,
-			"created_by":  "sync",
-			"item_count":  0, // Not tracked in local pricelists
-			"is_active":   true,
-			"created_at":  localPL.CreatedAt,
-			"synced_from": "local",
-		})
+		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid pricelist ID"})
 		return
 	}
 
-	c.JSON(http.StatusOK, pl)
+	localPL, err := h.localDB.GetLocalPricelistByServerID(uint(id))
+	if err != nil {
+		c.JSON(http.StatusNotFound, gin.H{"error": "pricelist not found"})
+		return
+	}
+	items, err := h.localDB.GetLocalPricelistItems(localPL.ID)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+	lotNames := make([]string, 0, len(items))
+	for _, item := range items {
+		lotNames = append(lotNames, item.LotName)
+	}
+	sort.Strings(lotNames)
+
+	c.JSON(http.StatusOK, gin.H{
+		"lot_names": lotNames,
+		"total":     len(lotNames),
+	})
+}
+
+// GetLatest returns the most recent active pricelist.
+func (h *PricelistHandler) GetLatest(c *gin.Context) {
+	source := c.DefaultQuery("source", string(models.PricelistSourceEstimate))
+	source = string(models.NormalizePricelistSource(source))
+
+	localPL, err := h.localDB.GetLatestLocalPricelistBySource(source)
+	if err != nil {
+		c.JSON(http.StatusNotFound, gin.H{"error": "no pricelists available"})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{
+		"id":          localPL.ServerID,
+		"source":      localPL.Source,
+		"version":     localPL.Version,
+		"created_by":  "sync",
+		"item_count":  h.localDB.CountLocalPricelistItems(localPL.ID),
+		"is_active":   true,
+		"created_at":  localPL.CreatedAt,
+		"synced_from": "local",
+	})
 }

internal/handlers/pricing.go

@@ -1,938 +0,0 @@
-package handlers
-
-import (
-	"net/http"
-	"sort"
-	"strconv"
-	"strings"
-	"time"
-
-	"github.com/gin-gonic/gin"
-	"git.mchus.pro/mchus/quoteforge/internal/models"
-	"git.mchus.pro/mchus/quoteforge/internal/repository"
-	"git.mchus.pro/mchus/quoteforge/internal/services/alerts"
-	"git.mchus.pro/mchus/quoteforge/internal/services/pricing"
-	"gorm.io/gorm"
-)
-
-// calculateMedian returns the median of a sorted slice of prices
-func calculateMedian(prices []float64) float64 {
-	if len(prices) == 0 {
-		return 0
-	}
-	sort.Float64s(prices)
-	n := len(prices)
-	if n%2 == 0 {
-		return (prices[n/2-1] + prices[n/2]) / 2
-	}
-	return prices[n/2]
-}
-
-// calculateAverage returns the arithmetic mean of prices
-func calculateAverage(prices []float64) float64 {
-	if len(prices) == 0 {
-		return 0
-	}
-	var sum float64
-	for _, p := range prices {
-		sum += p
-	}
-	return sum / float64(len(prices))
-}
-
-type PricingHandler struct {
-	db             *gorm.DB
-	pricingService *pricing.Service
-	alertService   *alerts.Service
-	componentRepo  *repository.ComponentRepository
-	priceRepo      *repository.PriceRepository
-	statsRepo      *repository.StatsRepository
-}
-
-func NewPricingHandler(
-	db *gorm.DB,
-	pricingService *pricing.Service,
-	alertService *alerts.Service,
-	componentRepo *repository.ComponentRepository,
-	priceRepo *repository.PriceRepository,
-	statsRepo *repository.StatsRepository,
-) *PricingHandler {
-	return &PricingHandler{
-		db:             db,
-		pricingService: pricingService,
-		alertService:   alertService,
-		componentRepo:  componentRepo,
-		priceRepo:      priceRepo,
-		statsRepo:      statsRepo,
-	}
-}
-
-func (h *PricingHandler) GetStats(c *gin.Context) {
-	// Check if we're in offline mode
-	if h.statsRepo == nil || h.alertService == nil {
-		c.JSON(http.StatusOK, gin.H{
-			"new_alerts_count":    0,
-			"top_components":      []interface{}{},
-			"trending_components": []interface{}{},
-			"offline":             true,
-		})
-		return
-	}
-
-	newAlerts, _ := h.alertService.GetNewAlertsCount()
-	topComponents, _ := h.statsRepo.GetTopComponents(10)
-	trendingComponents, _ := h.statsRepo.GetTrendingComponents(10)
-
-	c.JSON(http.StatusOK, gin.H{
-		"new_alerts_count":    newAlerts,
-		"top_components":      topComponents,
-		"trending_components": trendingComponents,
-	})
-}
-
-type ComponentWithCount struct {
-	models.LotMetadata
-	QuoteCount int64    `json:"quote_count"`
-	UsedInMeta []string `json:"used_in_meta,omitempty"` // List of meta-articles that use this component
-}
-
-func (h *PricingHandler) ListComponents(c *gin.Context) {
-	// Check if we're in offline mode
-	if h.componentRepo == nil {
-		c.JSON(http.StatusOK, gin.H{
-			"components": []ComponentWithCount{},
-			"total":      0,
-			"page":       1,
-			"per_page":   20,
-			"offline":    true,
-			"message":    "Управление ценами доступно только в онлайн режиме",
-		})
-		return
-	}
-
-	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
-	perPage, _ := strconv.Atoi(c.DefaultQuery("per_page", "20"))
-
-	filter := repository.ComponentFilter{
-		Category:  c.Query("category"),
-		Search:    c.Query("search"),
-		SortField: c.Query("sort"),
-		SortDir:   c.Query("dir"),
-	}
-
-	if page < 1 {
-		page = 1
-	}
-	if perPage < 1 || perPage > 100 {
-		perPage = 20
-	}
-	offset := (page - 1) * perPage
-
-	components, total, err := h.componentRepo.List(filter, offset, perPage)
-	if err != nil {
-		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
-		return
-	}
-
-	// Get quote counts
-	lotNames := make([]string, len(components))
-	for i, comp := range components {
-		lotNames[i] = comp.LotName
-	}
-
-	counts, _ := h.priceRepo.GetQuoteCounts(lotNames)
-
-	// Get meta usage information
-	metaUsage := h.getMetaUsageMap(lotNames)
-
-	// Combine components with counts
-	result := make([]ComponentWithCount, len(components))
-	for i, comp := range components {
-		result[i] = ComponentWithCount{
-			LotMetadata: comp,
-			QuoteCount:  counts[comp.LotName],
-			UsedInMeta:  metaUsage[comp.LotName],
-		}
-	}
-
-	c.JSON(http.StatusOK, gin.H{
-		"components": result,
-		"total":      total,
-		"page":       page,
-		"per_page":   perPage,
-	})
-}
-
-// getMetaUsageMap returns a map of lot_name -> list of meta-articles that use this component
-func (h *PricingHandler) getMetaUsageMap(lotNames []string) map[string][]string {
-	result := make(map[string][]string)
-
-	// Get all components with meta_prices
-	var metaComponents []models.LotMetadata
-	h.db.Where("meta_prices IS NOT NULL AND meta_prices != ''").Find(&metaComponents)
-
-	// Build reverse lookup: which components are used in which meta-articles
-	for _, meta := range metaComponents {
-		sources := strings.Split(meta.MetaPrices, ",")
-		for _, source := range sources {
-			source = strings.TrimSpace(source)
-			if source == "" {
-				continue
-			}
-
-			// Handle wildcard patterns
-			if strings.HasSuffix(source, "*") {
-				prefix := strings.TrimSuffix(source, "*")
-				for _, lotName := range lotNames {
-					if strings.HasPrefix(lotName, prefix) && lotName != meta.LotName {
-						result[lotName] = append(result[lotName], meta.LotName)
-					}
-				}
-			} else {
-				// Direct match
-				for _, lotName := range lotNames {
-					if lotName == source && lotName != meta.LotName {
-						result[lotName] = append(result[lotName], meta.LotName)
-					}
-				}
-			}
-		}
-	}
-
-	return result
-}
-
-// expandMetaPrices expands meta_prices string to list of actual lot names
-func (h *PricingHandler) expandMetaPrices(metaPrices, excludeLot string) []string {
-	sources := strings.Split(metaPrices, ",")
-	var result []string
-	seen := make(map[string]bool)
-
-	for _, source := range sources {
-		source = strings.TrimSpace(source)
-		if source == "" {
-			continue
-		}
-
-		if strings.HasSuffix(source, "*") {
-			// Wildcard pattern - find matching lots
-			prefix := strings.TrimSuffix(source, "*")
-			var matchingLots []string
-			h.db.Model(&models.LotMetadata{}).
-				Where("lot_name LIKE ? AND lot_name != ?", prefix+"%", excludeLot).
-				Pluck("lot_name", &matchingLots)
-			for _, lot := range matchingLots {
-				if !seen[lot] {
-					result = append(result, lot)
-					seen[lot] = true
-				}
-			}
-		} else if source != excludeLot && !seen[source] {
-			result = append(result, source)
-			seen[source] = true
-		}
-	}
-
-	return result
-}
-
-func (h *PricingHandler) GetComponentPricing(c *gin.Context) {
-	// Check if we're in offline mode
-	if h.componentRepo == nil || h.pricingService == nil {
-		c.JSON(http.StatusServiceUnavailable, gin.H{
-			"error":   "Управление ценами доступно только в онлайн режиме",
-			"offline": true,
-		})
-		return
-	}
-
-	lotName := c.Param("lot_name")
-
-	component, err := h.componentRepo.GetByLotName(lotName)
-	if err != nil {
-		c.JSON(http.StatusNotFound, gin.H{"error": "component not found"})
-		return
-	}
-
-	stats, err := h.pricingService.GetPriceStats(lotName, 0)
-	if err != nil {
-		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
-		return
-	}
-
-	c.JSON(http.StatusOK, gin.H{
-		"component":   component,
-		"price_stats": stats,
-	})
-}
-
-type UpdatePriceRequest struct {
-	LotName     string             `json:"lot_name" binding:"required"`
-	Method      models.PriceMethod `json:"method"`
-	PeriodDays  int                `json:"period_days"`
-	Coefficient float64            `json:"coefficient"`
-	ManualPrice *float64           `json:"manual_price"`
-	ClearManual bool               `json:"clear_manual"`
-	MetaEnabled bool               `json:"meta_enabled"`
-	MetaPrices  string             `json:"meta_prices"`
-	MetaMethod  string             `json:"meta_method"`
-	MetaPeriod  int                `json:"meta_period"`
-	IsHidden    bool               `json:"is_hidden"`
-}
-
-func (h *PricingHandler) UpdatePrice(c *gin.Context) {
-	// Check if we're in offline mode
-	if h.db == nil {
-		c.JSON(http.StatusServiceUnavailable, gin.H{
-			"error":   "Обновление цен доступно только в онлайн режиме",
-			"offline": true,
-		})
-		return
-	}
-
-	var req UpdatePriceRequest
-	if err := c.ShouldBindJSON(&req); err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
-		return
-	}
-
-	updates := map[string]interface{}{}
-
-	// Update method if specified
-	if req.Method != "" {
-		updates["price_method"] = req.Method
-	}
-
-	// Update period days
-	if req.PeriodDays >= 0 {
-		updates["price_period_days"] = req.PeriodDays
-	}
-
-	// Update coefficient
-	updates["price_coefficient"] = req.Coefficient
-
-	// Handle meta prices
-	if req.MetaEnabled && req.MetaPrices != "" {
-		updates["meta_prices"] = req.MetaPrices
-	} else {
-		updates["meta_prices"] = ""
-	}
-
-	// Handle hidden flag
-	updates["is_hidden"] = req.IsHidden
-
-	// Handle manual price
-	if req.ClearManual {
-		updates["manual_price"] = nil
-	} else if req.ManualPrice != nil {
-		updates["manual_price"] = *req.ManualPrice
-		// Also update current price immediately when setting manual
-		updates["current_price"] = *req.ManualPrice
-		updates["price_updated_at"] = time.Now()
-	}
-
-	err := h.db.Model(&models.LotMetadata{}).
-		Where("lot_name = ?", req.LotName).
-		Updates(updates).Error
-
-	if err != nil {
-		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
-		return
-	}
-
-	// Recalculate price if not using manual price
-	if req.ManualPrice == nil {
-		h.recalculateSinglePrice(req.LotName)
-	}
-
-	// Get updated component to return new price
-	var comp models.LotMetadata
-	h.db.Where("lot_name = ?", req.LotName).First(&comp)
-
-	c.JSON(http.StatusOK, gin.H{
-		"message":       "price updated",
-		"current_price": comp.CurrentPrice,
-	})
-}
-
-func (h *PricingHandler) recalculateSinglePrice(lotName string) {
-	var comp models.LotMetadata
-	if err := h.db.Where("lot_name = ?", lotName).First(&comp).Error; err != nil {
-		return
-	}
-
-	// Skip if manual price is set
-	if comp.ManualPrice != nil && *comp.ManualPrice > 0 {
-		return
-	}
-
-	periodDays := comp.PricePeriodDays
-	method := comp.PriceMethod
-	if method == "" {
-		method = models.PriceMethodMedian
-	}
-
-	// Determine which lot names to use for price calculation
-	lotNames := []string{lotName}
-	if comp.MetaPrices != "" {
-		lotNames = h.expandMetaPrices(comp.MetaPrices, lotName)
-	}
-
-	// Get prices based on period from all relevant lots
-	var prices []float64
-	for _, ln := range lotNames {
-		var lotPrices []float64
-		if strings.HasSuffix(ln, "*") {
-			pattern := strings.TrimSuffix(ln, "*") + "%"
-			if periodDays > 0 {
-				h.db.Raw(`SELECT price FROM lot_log WHERE lot LIKE ? AND date >= DATE_SUB(NOW(), INTERVAL ? DAY) ORDER BY price`,
-					pattern, periodDays).Pluck("price", &lotPrices)
-			} else {
-				h.db.Raw(`SELECT price FROM lot_log WHERE lot LIKE ? ORDER BY price`, pattern).Pluck("price", &lotPrices)
-			}
-		} else {
-			if periodDays > 0 {
-				h.db.Raw(`SELECT price FROM lot_log WHERE lot = ? AND date >= DATE_SUB(NOW(), INTERVAL ? DAY) ORDER BY price`,
-					ln, periodDays).Pluck("price", &lotPrices)
-			} else {
-				h.db.Raw(`SELECT price FROM lot_log WHERE lot = ? ORDER BY price`, ln).Pluck("price", &lotPrices)
-			}
-		}
-		prices = append(prices, lotPrices...)
-	}
-
-	// If no prices in period, try all time
-	if len(prices) == 0 && periodDays > 0 {
-		for _, ln := range lotNames {
-			var lotPrices []float64
-			if strings.HasSuffix(ln, "*") {
-				pattern := strings.TrimSuffix(ln, "*") + "%"
-				h.db.Raw(`SELECT price FROM lot_log WHERE lot LIKE ? ORDER BY price`, pattern).Pluck("price", &lotPrices)
-			} else {
-				h.db.Raw(`SELECT price FROM lot_log WHERE lot = ? ORDER BY price`, ln).Pluck("price", &lotPrices)
-			}
-			prices = append(prices, lotPrices...)
-		}
-	}
-
-	if len(prices) == 0 {
-		return
-	}
-
-	// Calculate price based on method
-	sortFloat64s(prices)
-	var finalPrice float64
-	switch method {
-	case models.PriceMethodMedian:
-		finalPrice = calculateMedian(prices)
-	case models.PriceMethodAverage:
-		finalPrice = calculateAverage(prices)
-	default:
-		finalPrice = calculateMedian(prices)
-	}
-
-	if finalPrice <= 0 {
-		return
-	}
-
-	// Apply coefficient
-	if comp.PriceCoefficient != 0 {
-		finalPrice = finalPrice * (1 + comp.PriceCoefficient/100)
-	}
-
-	now := time.Now()
-	// Only update price, preserve all user settings
-	h.db.Model(&models.LotMetadata{}).
-		Where("lot_name = ?", lotName).
-		Updates(map[string]interface{}{
-			"current_price":    finalPrice,
-			"price_updated_at": now,
-		})
-}
-
-func (h *PricingHandler) RecalculateAll(c *gin.Context) {
-	// Check if we're in offline mode
-	if h.db == nil {
-		c.JSON(http.StatusServiceUnavailable, gin.H{
-			"error":   "Пересчёт цен доступен только в онлайн режиме",
-			"offline": true,
-		})
-		return
-	}
-
-	// Set headers for SSE
-	c.Header("Content-Type", "text/event-stream")
-	c.Header("Cache-Control", "no-cache")
-	c.Header("Connection", "keep-alive")
-
-	// Get all components with their settings
-	var components []models.LotMetadata
-	h.db.Find(&components)
-	total := int64(len(components))
-
-	// Pre-load all lot names for efficient wildcard matching
-	var allLotNames []string
-	h.db.Model(&models.LotMetadata{}).Pluck("lot_name", &allLotNames)
-	lotNameSet := make(map[string]bool, len(allLotNames))
-	for _, ln := range allLotNames {
-		lotNameSet[ln] = true
-	}
-
-	// Pre-load latest quote dates for all lots (for checking updates)
-	type LotDate struct {
-		Lot  string
-		Date time.Time
-	}
-	var latestDates []LotDate
-	h.db.Raw(`SELECT lot, MAX(date) as date FROM lot_log GROUP BY lot`).Scan(&latestDates)
-	lotLatestDate := make(map[string]time.Time, len(latestDates))
-	for _, ld := range latestDates {
-		lotLatestDate[ld.Lot] = ld.Date
-	}
-
-	// Send initial progress
-	c.SSEvent("progress", gin.H{"current": 0, "total": total, "status": "starting"})
-	c.Writer.Flush()
-
-	// Process components individually to respect their settings
-	var updated, skipped, manual, unchanged, errors int
-	now := time.Now()
-	progressCounter := 0
-
-	for _, comp := range components {
-		progressCounter++
-
-		// If manual price is set, skip recalculation
-		if comp.ManualPrice != nil && *comp.ManualPrice > 0 {
-			manual++
-			goto sendProgress
-		}
-
-		// Calculate price based on component's individual settings
-		{
-			periodDays := comp.PricePeriodDays
-			method := comp.PriceMethod
-			if method == "" {
-				method = models.PriceMethodMedian
-			}
-
-			// Determine source lots for price calculation (using cached lot names)
-			var sourceLots []string
-			if comp.MetaPrices != "" {
-				sourceLots = expandMetaPricesWithCache(comp.MetaPrices, comp.LotName, allLotNames)
-			} else {
-				sourceLots = []string{comp.LotName}
-			}
-
-			if len(sourceLots) == 0 {
-				skipped++
-				goto sendProgress
-			}
-
-			// Check if there are new quotes since last update (using cached dates)
-			if comp.PriceUpdatedAt != nil {
-				hasNewData := false
-				for _, lot := range sourceLots {
-					if latestDate, ok := lotLatestDate[lot]; ok {
-						if latestDate.After(*comp.PriceUpdatedAt) {
-							hasNewData = true
-							break
-						}
-					}
-				}
-				if !hasNewData {
-					unchanged++
-					goto sendProgress
-				}
-			}
-
-			// Get prices from source lots
-			var prices []float64
-			if periodDays > 0 {
-				h.db.Raw(`SELECT price FROM lot_log WHERE lot IN ? AND date >= DATE_SUB(NOW(), INTERVAL ? DAY) ORDER BY price`,
-					sourceLots, periodDays).Pluck("price", &prices)
-			} else {
-				h.db.Raw(`SELECT price FROM lot_log WHERE lot IN ? ORDER BY price`,
-					sourceLots).Pluck("price", &prices)
-			}
-
-			// If no prices in period, try all time
-			if len(prices) == 0 && periodDays > 0 {
-				h.db.Raw(`SELECT price FROM lot_log WHERE lot IN ? ORDER BY price`, sourceLots).Pluck("price", &prices)
-			}
-
-			if len(prices) == 0 {
-				skipped++
-				goto sendProgress
-			}
-
-			// Calculate price based on method
-			var basePrice float64
-			switch method {
-			case models.PriceMethodMedian:
-				basePrice = calculateMedian(prices)
-			case models.PriceMethodAverage:
-				basePrice = calculateAverage(prices)
-			default:
-				basePrice = calculateMedian(prices)
-			}
-
-			if basePrice <= 0 {
-				skipped++
-				goto sendProgress
-			}
-
-			finalPrice := basePrice
-
-			// Apply coefficient
-			if comp.PriceCoefficient != 0 {
-				finalPrice = finalPrice * (1 + comp.PriceCoefficient/100)
-			}
-
-			// Update only price fields
-			err := h.db.Model(&models.LotMetadata{}).
-				Where("lot_name = ?", comp.LotName).
-				Updates(map[string]interface{}{
-					"current_price":    finalPrice,
-					"price_updated_at": now,
-				}).Error
-			if err != nil {
-				errors++
-			} else {
-				updated++
-			}
-		}
-
-	sendProgress:
-		// Send progress update every 10 components to reduce overhead
-		if progressCounter%10 == 0 || progressCounter == int(total) {
-			c.SSEvent("progress", gin.H{
-				"current":   updated + skipped + manual + unchanged + errors,
-				"total":     total,
-				"updated":   updated,
-				"skipped":   skipped,
-				"manual":    manual,
-				"unchanged": unchanged,
-				"errors":    errors,
-				"status":    "processing",
-				"lot_name":  comp.LotName,
-			})
-			c.Writer.Flush()
-		}
-	}
-
-	// Update popularity scores
-	h.statsRepo.UpdatePopularityScores()
-
-	// Send completion
-	c.SSEvent("progress", gin.H{
-		"current":   updated + skipped + manual + unchanged + errors,
-		"total":     total,
-		"updated":   updated,
-		"skipped":   skipped,
-		"manual":    manual,
-		"unchanged": unchanged,
-		"errors":    errors,
-		"status":    "completed",
-	})
-	c.Writer.Flush()
-}
-
-func (h *PricingHandler) ListAlerts(c *gin.Context) {
-	// Check if we're in offline mode
-	if h.db == nil {
-		c.JSON(http.StatusOK, gin.H{
-			"alerts":   []interface{}{},
-			"total":    0,
-			"page":     1,
-			"per_page": 20,
-			"offline":  true,
-		})
-		return
-	}
-
-	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
-	perPage, _ := strconv.Atoi(c.DefaultQuery("per_page", "20"))
-
-	filter := repository.AlertFilter{
-		Status:   models.AlertStatus(c.Query("status")),
-		Severity: models.AlertSeverity(c.Query("severity")),
-		Type:     models.AlertType(c.Query("type")),
-		LotName:  c.Query("lot_name"),
-	}
-
-	alertsList, total, err := h.alertService.List(filter, page, perPage)
-	if err != nil {
-		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
-		return
-	}
-
-	c.JSON(http.StatusOK, gin.H{
-		"alerts":   alertsList,
-		"total":    total,
-		"page":     page,
-		"per_page": perPage,
-	})
-}
-
-func (h *PricingHandler) AcknowledgeAlert(c *gin.Context) {
-	// Check if we're in offline mode
-	if h.db == nil {
-		c.JSON(http.StatusServiceUnavailable, gin.H{
-			"error":   "Управление алертами доступно только в онлайн режиме",
-			"offline": true,
-		})
-		return
-	}
-
-	id, err := strconv.ParseUint(c.Param("id"), 10, 32)
-	if err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid alert id"})
-		return
-	}
-
-	if err := h.alertService.Acknowledge(uint(id)); err != nil {
-		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
-		return
-	}
-
-	c.JSON(http.StatusOK, gin.H{"message": "acknowledged"})
-}
-
-func (h *PricingHandler) ResolveAlert(c *gin.Context) {
-	// Check if we're in offline mode
-	if h.db == nil {
-		c.JSON(http.StatusServiceUnavailable, gin.H{
-			"error":   "Управление алертами доступно только в онлайн режиме",
-			"offline": true,
-		})
-		return
-	}
-
-	id, err := strconv.ParseUint(c.Param("id"), 10, 32)
-	if err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid alert id"})
-		return
-	}
-
-	if err := h.alertService.Resolve(uint(id)); err != nil {
-		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
-		return
-	}
-
-	c.JSON(http.StatusOK, gin.H{"message": "resolved"})
-}
-
-func (h *PricingHandler) IgnoreAlert(c *gin.Context) {
-	// Check if we're in offline mode
-	if h.db == nil {
-		c.JSON(http.StatusServiceUnavailable, gin.H{
-			"error":   "Управление алертами доступно только в онлайн режиме",
-			"offline": true,
-		})
-		return
-	}
-
-	id, err := strconv.ParseUint(c.Param("id"), 10, 32)
-	if err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid alert id"})
-		return
-	}
-
-	if err := h.alertService.Ignore(uint(id)); err != nil {
-		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
-		return
-	}
-
-	c.JSON(http.StatusOK, gin.H{"message": "ignored"})
-}
-
-type PreviewPriceRequest struct {
-	LotName     string  `json:"lot_name" binding:"required"`
-	Method      string  `json:"method"`
-	PeriodDays  int     `json:"period_days"`
-	Coefficient float64 `json:"coefficient"`
-	MetaEnabled bool    `json:"meta_enabled"`
-	MetaPrices  string  `json:"meta_prices"`
-}
-
-func (h *PricingHandler) PreviewPrice(c *gin.Context) {
-	// Check if we're in offline mode
-	if h.db == nil {
-		c.JSON(http.StatusServiceUnavailable, gin.H{
-			"error":   "Предпросмотр цены доступен только в онлайн режиме",
-			"offline": true,
-		})
-		return
-	}
-
-	var req PreviewPriceRequest
-	if err := c.ShouldBindJSON(&req); err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
-		return
-	}
-
-	// Get component
-	var comp models.LotMetadata
-	if err := h.db.Where("lot_name = ?", req.LotName).First(&comp).Error; err != nil {
-		c.JSON(http.StatusNotFound, gin.H{"error": "component not found"})
-		return
-	}
-
-	// Determine which lot names to use for price calculation
-	lotNames := []string{req.LotName}
-	if req.MetaEnabled && req.MetaPrices != "" {
-		lotNames = h.expandMetaPrices(req.MetaPrices, req.LotName)
-	}
-
-	// Get all prices for calculations (from all relevant lots)
-	var allPrices []float64
-	for _, lotName := range lotNames {
-		var lotPrices []float64
-		if strings.HasSuffix(lotName, "*") {
-			// Wildcard pattern
-			pattern := strings.TrimSuffix(lotName, "*") + "%"
-			h.db.Raw(`SELECT price FROM lot_log WHERE lot LIKE ? ORDER BY price`, pattern).Pluck("price", &lotPrices)
-		} else {
-			h.db.Raw(`SELECT price FROM lot_log WHERE lot = ? ORDER BY price`, lotName).Pluck("price", &lotPrices)
-		}
-		allPrices = append(allPrices, lotPrices...)
-	}
-
-	// Calculate median for all time
-	var medianAllTime *float64
-	if len(allPrices) > 0 {
-		sortFloat64s(allPrices)
-		median := calculateMedian(allPrices)
-		medianAllTime = &median
-	}
-
-	// Get quote count (from all relevant lots) - total count
-	var quoteCountTotal int64
-	for _, lotName := range lotNames {
-		var count int64
-		if strings.HasSuffix(lotName, "*") {
-			pattern := strings.TrimSuffix(lotName, "*") + "%"
-			h.db.Model(&models.LotLog{}).Where("lot LIKE ?", pattern).Count(&count)
-		} else {
-			h.db.Model(&models.LotLog{}).Where("lot = ?", lotName).Count(&count)
-		}
-		quoteCountTotal += count
-	}
-
-	// Get quote count for specified period (if period is > 0)
-	var quoteCountPeriod int64
-	if req.PeriodDays > 0 {
-		for _, lotName := range lotNames {
-			var count int64
-			if strings.HasSuffix(lotName, "*") {
-				pattern := strings.TrimSuffix(lotName, "*") + "%"
-				h.db.Raw(`SELECT COUNT(*) FROM lot_log WHERE lot LIKE ? AND date >= DATE_SUB(NOW(), INTERVAL ? DAY)`, pattern, req.PeriodDays).Scan(&count)
-			} else {
-				h.db.Raw(`SELECT COUNT(*) FROM lot_log WHERE lot = ? AND date >= DATE_SUB(NOW(), INTERVAL ? DAY)`, lotName, req.PeriodDays).Scan(&count)
-			}
-			quoteCountPeriod += count
-		}
-	} else {
-		// If no period specified, period count equals total count
-		quoteCountPeriod = quoteCountTotal
-	}
-
-	// Get last received price (from the main lot only)
-	var lastPrice struct {
-		Price *float64
-		Date  *time.Time
-	}
-	h.db.Raw(`SELECT price, date FROM lot_log WHERE lot = ? ORDER BY date DESC, lot_log_id DESC LIMIT 1`, req.LotName).Scan(&lastPrice)
-
-	// Calculate new price based on parameters (method, period, coefficient)
-	method := req.Method
-	if method == "" {
-		method = "median"
-	}
-
-	var prices []float64
-	if req.PeriodDays > 0 {
-		for _, lotName := range lotNames {
-			var lotPrices []float64
-			if strings.HasSuffix(lotName, "*") {
-				pattern := strings.TrimSuffix(lotName, "*") + "%"
-				h.db.Raw(`SELECT price FROM lot_log WHERE lot LIKE ? AND date >= DATE_SUB(NOW(), INTERVAL ? DAY) ORDER BY price`,
-					pattern, req.PeriodDays).Pluck("price", &lotPrices)
-			} else {
-				h.db.Raw(`SELECT price FROM lot_log WHERE lot = ? AND date >= DATE_SUB(NOW(), INTERVAL ? DAY) ORDER BY price`,
-					lotName, req.PeriodDays).Pluck("price", &lotPrices)
-			}
-			prices = append(prices, lotPrices...)
-		}
-		// Fall back to all time if no prices in period
-		if len(prices) == 0 {
-			prices = allPrices
-		}
-	} else {
-		prices = allPrices
-	}
-
-	var newPrice *float64
-	if len(prices) > 0 {
-		sortFloat64s(prices)
-		var basePrice float64
-		if method == "average" {
-			basePrice = calculateAverage(prices)
-		} else {
-			basePrice = calculateMedian(prices)
-		}
-
-		if req.Coefficient != 0 {
-			basePrice = basePrice * (1 + req.Coefficient/100)
-		}
-		newPrice = &basePrice
-	}
-
-	c.JSON(http.StatusOK, gin.H{
-		"lot_name":           req.LotName,
-		"current_price":      comp.CurrentPrice,
-		"median_all_time":    medianAllTime,
-		"new_price":          newPrice,
-		"quote_count_total":  quoteCountTotal,
-		"quote_count_period": quoteCountPeriod,
-		"manual_price":       comp.ManualPrice,
-		"last_price":         lastPrice.Price,
-		"last_price_date":    lastPrice.Date,
-	})
-}
-
-// sortFloat64s sorts a slice of float64 in ascending order
-func sortFloat64s(data []float64) {
-	sort.Float64s(data)
-}
-
-// expandMetaPricesWithCache expands meta_prices using pre-loaded lot names (no DB queries)
-func expandMetaPricesWithCache(metaPrices, excludeLot string, allLotNames []string) []string {
-	sources := strings.Split(metaPrices, ",")
-	var result []string
-	seen := make(map[string]bool)
-
-	for _, source := range sources {
-		source = strings.TrimSpace(source)
-		if source == "" || source == excludeLot {
-			continue
-		}
-
-		if strings.HasSuffix(source, "*") {
-			// Wildcard pattern - find matching lots from cache
-			prefix := strings.TrimSuffix(source, "*")
-			for _, lot := range allLotNames {
-				if strings.HasPrefix(lot, prefix) && lot != excludeLot && !seen[lot] {
-					result = append(result, lot)
-					seen[lot] = true
-				}
-			}
-		} else if !seen[source] {
-			result = append(result, source)
-			seen[source] = true
-		}
-	}
-
-	return result
-}

internal/handlers/quote.go

@@ -3,8 +3,8 @@ package handlers
 import (
 	"net/http"
 
-	"github.com/gin-gonic/gin"
 	"git.mchus.pro/mchus/quoteforge/internal/services"
+	"github.com/gin-gonic/gin"
 )
 
 type QuoteHandler struct {
@@ -49,3 +49,19 @@ func (h *QuoteHandler) Calculate(c *gin.Context) {
 		"total": result.Total,
 	})
 }
+
+func (h *QuoteHandler) PriceLevels(c *gin.Context) {
+	var req services.PriceLevelsRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	result, err := h.quoteService.CalculatePriceLevels(&req)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusOK, result)
+}

internal/handlers/setup.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"html/template"
 	"log/slog"
+	"net"
 	"net/http"
 	"os"
 	"path/filepath"
@@ -13,8 +14,9 @@ import (
 	qfassets "git.mchus.pro/mchus/quoteforge"
 	"git.mchus.pro/mchus/quoteforge/internal/db"
 	"git.mchus.pro/mchus/quoteforge/internal/localdb"
+	mysqlDriver "github.com/go-sql-driver/mysql"
 	"github.com/gin-gonic/gin"
-	"gorm.io/driver/mysql"
+	gormmysql "gorm.io/driver/mysql"
 	"gorm.io/gorm"
 	"gorm.io/gorm/logger"
 )
@@ -93,10 +95,9 @@ func (h *SetupHandler) TestConnection(c *gin.Context) {
 		}
 	}
 
-	dsn := fmt.Sprintf("%s:%s@tcp(%s:%d)/%s?charset=utf8mb4&parseTime=True&loc=Local&timeout=5s",
-		user, password, host, port, database)
+	dsn := buildMySQLDSN(host, port, database, user, password, 5*time.Second)
 
-	db, err := gorm.Open(mysql.Open(dsn), &gorm.Config{
+	db, err := gorm.Open(gormmysql.Open(dsn), &gorm.Config{
 		Logger: logger.Default.LogMode(logger.Silent),
 	})
 	if err != nil {
@@ -148,6 +149,8 @@ func (h *SetupHandler) TestConnection(c *gin.Context) {
 
 // SaveConnection saves the connection settings and signals restart
 func (h *SetupHandler) SaveConnection(c *gin.Context) {
+	existingSettings, _ := h.localDB.GetSettings()
+
 	host := c.PostForm("host")
 	portStr := c.PostForm("port")
 	database := c.PostForm("database")
@@ -167,10 +170,9 @@ func (h *SetupHandler) SaveConnection(c *gin.Context) {
 	}
 
 	// Test connection first
-	dsn := fmt.Sprintf("%s:%s@tcp(%s:%d)/%s?charset=utf8mb4&parseTime=True&loc=Local&timeout=5s",
-		user, password, host, port, database)
+	dsn := buildMySQLDSN(host, port, database, user, password, 5*time.Second)
 
-	db, err := gorm.Open(mysql.Open(dsn), &gorm.Config{
+	db, err := gorm.Open(gormmysql.Open(dsn), &gorm.Config{
 		Logger: logger.Default.LogMode(logger.Silent),
 	})
 	if err != nil {
@@ -202,18 +204,29 @@ func (h *SetupHandler) SaveConnection(c *gin.Context) {
 		}
 	}
 
-	// Always restart to properly initialize all services with the new connection
+	settingsChanged := existingSettings == nil ||
+		existingSettings.Host != host ||
+		existingSettings.Port != port ||
+		existingSettings.Database != database ||
+		existingSettings.User != user ||
+		existingSettings.PasswordEncrypted != password
+
+	restartQueued := settingsChanged && h.restartSig != nil
 	c.JSON(http.StatusOK, gin.H{
 		"success":          true,
-		"message":          "Settings saved. Please restart the application to apply changes.",
-		"restart_required": true,
+		"message":          "Settings saved.",
+		"restart_required": settingsChanged,
+		"restart_queued":   restartQueued,
 	})
 
 	// Signal restart after response is sent (if restart signal is configured)
-	if h.restartSig != nil {
+	if restartQueued {
 		go func() {
 			time.Sleep(500 * time.Millisecond) // Give time for response to be sent
-			h.restartSig <- struct{}{}
+			select {
+			case h.restartSig <- struct{}{}:
+			default:
+			}
 		}()
 	}
 }
@@ -241,3 +254,19 @@ func testWritePermission(db *gorm.DB) bool {
 
 	return true
 }
+
+func buildMySQLDSN(host string, port int, database, user, password string, timeout time.Duration) string {
+	cfg := mysqlDriver.NewConfig()
+	cfg.User = user
+	cfg.Passwd = password
+	cfg.Net = "tcp"
+	cfg.Addr = net.JoinHostPort(host, strconv.Itoa(port))
+	cfg.DBName = database
+	cfg.ParseTime = true
+	cfg.Loc = time.Local
+	cfg.Timeout = timeout
+	cfg.Params = map[string]string{
+		"charset": "utf8mb4",
+	}
+	return cfg.FormatDSN()
+}

internal/handlers/sync.go

@@ -1,11 +1,14 @@
 package handlers
 
 import (
+	"errors"
+	"fmt"
 	"html/template"
 	"log/slog"
 	"net/http"
 	"os"
 	"path/filepath"
+	stdsync "sync"
 	"time"
 
 	qfassets "git.mchus.pro/mchus/quoteforge"
@@ -17,14 +20,19 @@ import (
 
 // SyncHandler handles sync API endpoints
 type SyncHandler struct {
-	localDB     *localdb.LocalDB
-	syncService *sync.Service
-	connMgr     *db.ConnectionManager
-	tmpl        *template.Template
+	localDB           *localdb.LocalDB
+	syncService       *sync.Service
+	connMgr           *db.ConnectionManager
+	autoSyncInterval  time.Duration
+	onlineGraceFactor float64
+	tmpl              *template.Template
+	readinessMu       stdsync.Mutex
+	readinessCached   *sync.SyncReadiness
+	readinessCachedAt time.Time
 }
 
 // NewSyncHandler creates a new sync handler
-func NewSyncHandler(localDB *localdb.LocalDB, syncService *sync.Service, connMgr *db.ConnectionManager, templatesPath string) (*SyncHandler, error) {
+func NewSyncHandler(localDB *localdb.LocalDB, syncService *sync.Service, connMgr *db.ConnectionManager, templatesPath string, autoSyncInterval time.Duration) (*SyncHandler, error) {
 	// Load sync_status partial template
 	partialPath := filepath.Join(templatesPath, "partials", "sync_status.html")
 	var tmpl *template.Template
@@ -39,23 +47,35 @@ func NewSyncHandler(localDB *localdb.LocalDB, syncService *sync.Service, connMgr
 	}
 
 	return &SyncHandler{
-		localDB:     localDB,
-		syncService: syncService,
-		connMgr:     connMgr,
-		tmpl:        tmpl,
+		localDB:           localDB,
+		syncService:       syncService,
+		connMgr:           connMgr,
+		autoSyncInterval:  autoSyncInterval,
+		onlineGraceFactor: 1.10,
+		tmpl:              tmpl,
 	}, nil
 }
 
 // SyncStatusResponse represents the sync status
 type SyncStatusResponse struct {
-	LastComponentSync *time.Time `json:"last_component_sync"`
-	LastPricelistSync *time.Time `json:"last_pricelist_sync"`
-	IsOnline          bool       `json:"is_online"`
-	ComponentsCount   int64      `json:"components_count"`
-	PricelistsCount   int64      `json:"pricelists_count"`
-	ServerPricelists  int        `json:"server_pricelists"`
-	NeedComponentSync bool       `json:"need_component_sync"`
-	NeedPricelistSync bool       `json:"need_pricelist_sync"`
+	LastComponentSync *time.Time          `json:"last_component_sync"`
+	LastPricelistSync *time.Time          `json:"last_pricelist_sync"`
+	IsOnline          bool                `json:"is_online"`
+	ComponentsCount   int64               `json:"components_count"`
+	PricelistsCount   int64               `json:"pricelists_count"`
+	ServerPricelists  int                 `json:"server_pricelists"`
+	NeedComponentSync bool                `json:"need_component_sync"`
+	NeedPricelistSync bool                `json:"need_pricelist_sync"`
+	Readiness         *sync.SyncReadiness `json:"readiness,omitempty"`
+}
+
+type SyncReadinessResponse struct {
+	Status                string     `json:"status"`
+	Blocked               bool       `json:"blocked"`
+	ReasonCode            string     `json:"reason_code,omitempty"`
+	ReasonText            string     `json:"reason_text,omitempty"`
+	RequiredMinAppVersion *string    `json:"required_min_app_version,omitempty"`
+	LastCheckedAt         *time.Time `json:"last_checked_at,omitempty"`
 }
 
 // GetStatus returns current sync status
@@ -85,6 +105,7 @@ func (h *SyncHandler) GetStatus(c *gin.Context) {
 
 	// Check if component sync is needed (older than 24 hours)
 	needComponentSync := h.localDB.NeedComponentSync(24)
+	readiness := h.getReadinessCached(10 * time.Second)
 
 	c.JSON(http.StatusOK, SyncStatusResponse{
 		LastComponentSync: lastComponentSync,
@@ -95,9 +116,63 @@ func (h *SyncHandler) GetStatus(c *gin.Context) {
 		ServerPricelists:  serverPricelists,
 		NeedComponentSync: needComponentSync,
 		NeedPricelistSync: needPricelistSync,
+		Readiness:         readiness,
 	})
 }
 
+// GetReadiness returns sync readiness guard status.
+// GET /api/sync/readiness
+func (h *SyncHandler) GetReadiness(c *gin.Context) {
+	readiness, err := h.syncService.GetReadiness()
+	if err != nil && readiness == nil {
+		c.JSON(http.StatusInternalServerError, gin.H{
+			"error": err.Error(),
+		})
+		return
+	}
+	if readiness == nil {
+		c.JSON(http.StatusOK, SyncReadinessResponse{Status: sync.ReadinessUnknown, Blocked: false})
+		return
+	}
+	c.JSON(http.StatusOK, SyncReadinessResponse{
+		Status:                readiness.Status,
+		Blocked:               readiness.Blocked,
+		ReasonCode:            readiness.ReasonCode,
+		ReasonText:            readiness.ReasonText,
+		RequiredMinAppVersion: readiness.RequiredMinAppVersion,
+		LastCheckedAt:         readiness.LastCheckedAt,
+	})
+}
+
+func (h *SyncHandler) ensureSyncReadiness(c *gin.Context) bool {
+	readiness, err := h.syncService.EnsureReadinessForSync()
+	if err == nil {
+		return true
+	}
+
+	blocked := &sync.SyncBlockedError{}
+	if errors.As(err, &blocked) {
+		c.JSON(http.StatusLocked, gin.H{
+			"success":                  false,
+			"error":                    blocked.Error(),
+			"reason_code":              blocked.Readiness.ReasonCode,
+			"reason_text":              blocked.Readiness.ReasonText,
+			"required_min_app_version": blocked.Readiness.RequiredMinAppVersion,
+			"status":                   blocked.Readiness.Status,
+			"blocked":                  true,
+			"last_checked_at":          blocked.Readiness.LastCheckedAt,
+		})
+		return false
+	}
+
+	c.JSON(http.StatusInternalServerError, gin.H{
+		"success": false,
+		"error":   err.Error(),
+	})
+	_ = readiness
+	return false
+}
+
 // SyncResultResponse represents sync operation result
 type SyncResultResponse struct {
 	Success  bool   `json:"success"`
@@ -109,11 +184,7 @@ type SyncResultResponse struct {
 // SyncComponents syncs components from MariaDB to local SQLite
 // POST /api/sync/components
 func (h *SyncHandler) SyncComponents(c *gin.Context) {
-	if !h.checkOnline() {
-		c.JSON(http.StatusServiceUnavailable, gin.H{
-			"success": false,
-			"error":   "Database is offline",
-		})
+	if !h.ensureSyncReadiness(c) {
 		return
 	}
 
@@ -148,11 +219,7 @@ func (h *SyncHandler) SyncComponents(c *gin.Context) {
 // SyncPricelists syncs pricelists from MariaDB to local SQLite
 // POST /api/sync/pricelists
 func (h *SyncHandler) SyncPricelists(c *gin.Context) {
-	if !h.checkOnline() {
-		c.JSON(http.StatusServiceUnavailable, gin.H{
-			"success": false,
-			"error":   "Database is offline",
-		})
+	if !h.ensureSyncReadiness(c) {
 		return
 	}
 
@@ -173,30 +240,47 @@ func (h *SyncHandler) SyncPricelists(c *gin.Context) {
 		Synced:   synced,
 		Duration: time.Since(startTime).String(),
 	})
+	h.syncService.RecordSyncHeartbeat()
 }
 
 // SyncAllResponse represents result of full sync
 type SyncAllResponse struct {
-	Success          bool   `json:"success"`
-	Message          string `json:"message"`
-	ComponentsSynced int    `json:"components_synced"`
-	PricelistsSynced int    `json:"pricelists_synced"`
-	Duration         string `json:"duration"`
+	Success                bool   `json:"success"`
+	Message                string `json:"message"`
+	PendingPushed          int    `json:"pending_pushed"`
+	ComponentsSynced       int    `json:"components_synced"`
+	PricelistsSynced       int    `json:"pricelists_synced"`
+	ProjectsImported       int    `json:"projects_imported"`
+	ProjectsUpdated        int    `json:"projects_updated"`
+	ProjectsSkipped        int    `json:"projects_skipped"`
+	ConfigurationsImported int    `json:"configurations_imported"`
+	ConfigurationsUpdated  int    `json:"configurations_updated"`
+	ConfigurationsSkipped  int    `json:"configurations_skipped"`
+	Duration               string `json:"duration"`
 }
 
-// SyncAll syncs both components and pricelists
+// SyncAll performs full bidirectional sync:
+// - push pending local changes (projects/configurations) to server
+// - pull components, pricelists, projects, and configurations from server
 // POST /api/sync/all
 func (h *SyncHandler) SyncAll(c *gin.Context) {
-	if !h.checkOnline() {
-		c.JSON(http.StatusServiceUnavailable, gin.H{
-			"success": false,
-			"error":   "Database is offline",
-		})
+	if !h.ensureSyncReadiness(c) {
 		return
 	}
 
 	startTime := time.Now()
-	var componentsSynced, pricelistsSynced int
+	var pendingPushed, componentsSynced, pricelistsSynced int
+
+	// Push local pending changes first (projects/configurations)
+	pendingPushed, err := h.syncService.PushPendingChanges()
+	if err != nil {
+		slog.Error("pending push failed during full sync", "error", err)
+		c.JSON(http.StatusInternalServerError, gin.H{
+			"success": false,
+			"error":   "Pending changes push failed: " + err.Error(),
+		})
+		return
+	}
 
 	// Sync components
 	mariaDB, err := h.connMgr.GetDB()
@@ -226,18 +310,56 @@ func (h *SyncHandler) SyncAll(c *gin.Context) {
 		c.JSON(http.StatusInternalServerError, gin.H{
 			"success":           false,
 			"error":             "Pricelist sync failed: " + err.Error(),
+			"pending_pushed":    pendingPushed,
 			"components_synced": componentsSynced,
 		})
 		return
 	}
 
+	projectsResult, err := h.syncService.ImportProjectsToLocal()
+	if err != nil {
+		slog.Error("project import failed during full sync", "error", err)
+		c.JSON(http.StatusInternalServerError, gin.H{
+			"success":           false,
+			"error":             "Project import failed: " + err.Error(),
+			"pending_pushed":    pendingPushed,
+			"components_synced": componentsSynced,
+			"pricelists_synced": pricelistsSynced,
+		})
+		return
+	}
+
+	configsResult, err := h.syncService.ImportConfigurationsToLocal()
+	if err != nil {
+		slog.Error("configuration import failed during full sync", "error", err)
+		c.JSON(http.StatusInternalServerError, gin.H{
+			"success":           false,
+			"error":             "Configuration import failed: " + err.Error(),
+			"pending_pushed":    pendingPushed,
+			"components_synced": componentsSynced,
+			"pricelists_synced": pricelistsSynced,
+			"projects_imported": projectsResult.Imported,
+			"projects_updated":  projectsResult.Updated,
+			"projects_skipped":  projectsResult.Skipped,
+		})
+		return
+	}
+
 	c.JSON(http.StatusOK, SyncAllResponse{
-		Success:          true,
-		Message:          "Full sync completed successfully",
-		ComponentsSynced: componentsSynced,
-		PricelistsSynced: pricelistsSynced,
-		Duration:         time.Since(startTime).String(),
+		Success:                true,
+		Message:                "Full sync completed successfully",
+		PendingPushed:          pendingPushed,
+		ComponentsSynced:       componentsSynced,
+		PricelistsSynced:       pricelistsSynced,
+		ProjectsImported:       projectsResult.Imported,
+		ProjectsUpdated:        projectsResult.Updated,
+		ProjectsSkipped:        projectsResult.Skipped,
+		ConfigurationsImported: configsResult.Imported,
+		ConfigurationsUpdated:  configsResult.Updated,
+		ConfigurationsSkipped:  configsResult.Skipped,
+		Duration:               time.Since(startTime).String(),
 	})
+	h.syncService.RecordSyncHeartbeat()
 }
 
 // checkOnline checks if MariaDB is accessible
@@ -248,11 +370,7 @@ func (h *SyncHandler) checkOnline() bool {
 // PushPendingChanges pushes all pending changes to the server
 // POST /api/sync/push
 func (h *SyncHandler) PushPendingChanges(c *gin.Context) {
-	if !h.checkOnline() {
-		c.JSON(http.StatusServiceUnavailable, gin.H{
-			"success": false,
-			"error":   "Database is offline",
-		})
+	if !h.ensureSyncReadiness(c) {
 		return
 	}
 
@@ -273,6 +391,7 @@ func (h *SyncHandler) PushPendingChanges(c *gin.Context) {
 		Synced:   pushed,
 		Duration: time.Since(startTime).String(),
 	})
+	h.syncService.RecordSyncHeartbeat()
 }
 
 // GetPendingCount returns the number of pending changes
@@ -300,12 +419,40 @@ func (h *SyncHandler) GetPendingChanges(c *gin.Context) {
 	})
 }
 
-// SyncInfoResponse represents sync information
+// SyncInfoResponse represents sync information for the modal
 type SyncInfoResponse struct {
-	LastSyncAt *time.Time  `json:"last_sync_at"`
-	IsOnline   bool        `json:"is_online"`
+	// Connection
+	DBHost string `json:"db_host"`
+	DBUser string `json:"db_user"`
+	DBName string `json:"db_name"`
+
+	// Status
+	IsOnline   bool       `json:"is_online"`
+	LastSyncAt *time.Time `json:"last_sync_at"`
+
+	// Statistics
+	LotCount     int64 `json:"lot_count"`
+	LotLogCount  int64 `json:"lot_log_count"`
+	ConfigCount  int64 `json:"config_count"`
+	ProjectCount int64 `json:"project_count"`
+
+	// Pending changes
+	PendingChanges []localdb.PendingChange `json:"pending_changes"`
+
+	// Errors
 	ErrorCount int         `json:"error_count"`
 	Errors     []SyncError `json:"errors,omitempty"`
+
+	// Readiness guard
+	Readiness *sync.SyncReadiness `json:"readiness,omitempty"`
+}
+
+type SyncUsersStatusResponse struct {
+	IsOnline                bool                  `json:"is_online"`
+	AutoSyncIntervalSeconds int64                 `json:"auto_sync_interval_seconds"`
+	OnlineThresholdSeconds  int64                 `json:"online_threshold_seconds"`
+	GeneratedAt             time.Time             `json:"generated_at"`
+	Users                   []sync.UserSyncStatus `json:"users"`
 }
 
 // SyncError represents a sync error
@@ -320,31 +467,44 @@ func (h *SyncHandler) GetInfo(c *gin.Context) {
 	// Check online status by pinging MariaDB
 	isOnline := h.checkOnline()
 
+	// Get DB connection info
+	var dbHost, dbUser, dbName string
+	if settings, err := h.localDB.GetSettings(); err == nil {
+		dbHost = settings.Host + ":" + fmt.Sprintf("%d", settings.Port)
+		dbUser = settings.User
+		dbName = settings.Database
+	}
+
 	// Get sync times
 	lastPricelistSync := h.localDB.GetLastSyncTime()
 
+	// Get MariaDB counts (if online)
+	var lotCount, lotLogCount int64
+	if isOnline {
+		if mariaDB, err := h.connMgr.GetDB(); err == nil {
+			mariaDB.Table("lot").Count(&lotCount)
+			mariaDB.Table("lot_log").Count(&lotLogCount)
+		}
+	}
+
+	// Get local counts
+	configCount := h.localDB.CountConfigurations()
+	projectCount := h.localDB.CountProjects()
+
 	// Get error count (only changes with LastError != "")
 	errorCount := int(h.localDB.CountErroredChanges())
 
-	// Get recent errors (last 10)
+	// Get pending changes
 	changes, err := h.localDB.GetPendingChanges()
 	if err != nil {
 		slog.Error("failed to get pending changes for sync info", "error", err)
-		// Even if we can't get changes, we can still return the error count
-		c.JSON(http.StatusOK, SyncInfoResponse{
-			LastSyncAt: lastPricelistSync,
-			IsOnline:   isOnline,
-			ErrorCount: errorCount,
-			Errors:     []SyncError{}, // Return empty errors list
-		})
-		return
+		changes = []localdb.PendingChange{}
 	}
 
-	var errors []SyncError
+	var syncErrors []SyncError
 	for _, change := range changes {
-		// Check if there's a last error and it's not empty
 		if change.LastError != "" {
-			errors = append(errors, SyncError{
+			syncErrors = append(syncErrors, SyncError{
 				Timestamp: change.CreatedAt,
 				Message:   change.LastError,
 			})
@@ -352,15 +512,63 @@ func (h *SyncHandler) GetInfo(c *gin.Context) {
 	}
 
 	// Limit to last 10 errors
-	if len(errors) > 10 {
-		errors = errors[:10]
+	if len(syncErrors) > 10 {
+		syncErrors = syncErrors[:10]
 	}
 
+	readiness := h.getReadinessCached(10 * time.Second)
+
 	c.JSON(http.StatusOK, SyncInfoResponse{
-		LastSyncAt: lastPricelistSync,
-		IsOnline:   isOnline,
-		ErrorCount: errorCount,
-		Errors:     errors,
+		DBHost:         dbHost,
+		DBUser:         dbUser,
+		DBName:         dbName,
+		IsOnline:       isOnline,
+		LastSyncAt:     lastPricelistSync,
+		LotCount:       lotCount,
+		LotLogCount:    lotLogCount,
+		ConfigCount:    configCount,
+		ProjectCount:   projectCount,
+		PendingChanges: changes,
+		ErrorCount:     errorCount,
+		Errors:         syncErrors,
+		Readiness:      readiness,
+	})
+}
+
+// GetUsersStatus returns last sync timestamps for users with sync heartbeats.
+// GET /api/sync/users-status
+func (h *SyncHandler) GetUsersStatus(c *gin.Context) {
+	threshold := time.Duration(float64(h.autoSyncInterval) * h.onlineGraceFactor)
+	isOnline := h.checkOnline()
+
+	if !isOnline {
+		c.JSON(http.StatusOK, SyncUsersStatusResponse{
+			IsOnline:                false,
+			AutoSyncIntervalSeconds: int64(h.autoSyncInterval.Seconds()),
+			OnlineThresholdSeconds:  int64(threshold.Seconds()),
+			GeneratedAt:             time.Now().UTC(),
+			Users:                   []sync.UserSyncStatus{},
+		})
+		return
+	}
+
+	// Keep current client heartbeat fresh so app version is available in the table.
+	h.syncService.RecordSyncHeartbeat()
+
+	users, err := h.syncService.ListUserSyncStatuses(threshold)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{
+			"error": err.Error(),
+		})
+		return
+	}
+
+	c.JSON(http.StatusOK, SyncUsersStatusResponse{
+		IsOnline:                true,
+		AutoSyncIntervalSeconds: int64(h.autoSyncInterval.Seconds()),
+		OnlineThresholdSeconds:  int64(threshold.Seconds()),
+		GeneratedAt:             time.Now().UTC(),
+		Users:                   users,
 	})
 }
 
@@ -380,12 +588,21 @@ func (h *SyncHandler) SyncStatusPartial(c *gin.Context) {
 
 	// Get pending count
 	pendingCount := h.localDB.GetPendingCount()
+	readiness := h.getReadinessCached(10 * time.Second)
+	isBlocked := readiness != nil && readiness.Blocked
 
-	slog.Debug("rendering sync status", "is_offline", isOffline, "pending_count", pendingCount)
+	slog.Debug("rendering sync status", "is_offline", isOffline, "pending_count", pendingCount, "sync_blocked", isBlocked)
 
 	data := gin.H{
 		"IsOffline":    isOffline,
 		"PendingCount": pendingCount,
+		"IsBlocked":    isBlocked,
+		"BlockedReason": func() string {
+			if readiness == nil {
+				return ""
+			}
+			return readiness.ReasonText
+		}(),
 	}
 
 	c.Header("Content-Type", "text/html; charset=utf-8")
@@ -394,3 +611,24 @@ func (h *SyncHandler) SyncStatusPartial(c *gin.Context) {
 		c.String(http.StatusInternalServerError, "Template error: "+err.Error())
 	}
 }
+
+func (h *SyncHandler) getReadinessCached(maxAge time.Duration) *sync.SyncReadiness {
+	h.readinessMu.Lock()
+	if h.readinessCached != nil && time.Since(h.readinessCachedAt) < maxAge {
+		cached := *h.readinessCached
+		h.readinessMu.Unlock()
+		return &cached
+	}
+	h.readinessMu.Unlock()
+
+	readiness, err := h.syncService.GetReadiness()
+	if err != nil && readiness == nil {
+		return nil
+	}
+
+	h.readinessMu.Lock()
+	h.readinessCached = readiness
+	h.readinessCachedAt = time.Now()
+	h.readinessMu.Unlock()
+	return readiness
+}

internal/handlers/sync_readiness_test.go

@@ -0,0 +1,64 @@
+package handlers
+
+import (
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"path/filepath"
+	"testing"
+	"time"
+
+	"git.mchus.pro/mchus/quoteforge/internal/localdb"
+	syncsvc "git.mchus.pro/mchus/quoteforge/internal/services/sync"
+	"github.com/gin-gonic/gin"
+)
+
+func TestSyncReadinessOfflineBlocked(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+
+	dir := t.TempDir()
+	local, err := localdb.New(filepath.Join(dir, "qfs.db"))
+	if err != nil {
+		t.Fatalf("init local db: %v", err)
+	}
+
+	service := syncsvc.NewService(nil, local)
+	h, err := NewSyncHandler(local, service, nil, filepath.Join("web", "templates"), 5*time.Minute)
+	if err != nil {
+		t.Fatalf("new sync handler: %v", err)
+	}
+
+	router := gin.New()
+	router.GET("/api/sync/readiness", h.GetReadiness)
+	router.POST("/api/sync/push", h.PushPendingChanges)
+
+	readinessResp := httptest.NewRecorder()
+	readinessReq, _ := http.NewRequest(http.MethodGet, "/api/sync/readiness", nil)
+	router.ServeHTTP(readinessResp, readinessReq)
+	if readinessResp.Code != http.StatusOK {
+		t.Fatalf("unexpected readiness status: %d", readinessResp.Code)
+	}
+
+	var readinessBody map[string]any
+	if err := json.Unmarshal(readinessResp.Body.Bytes(), &readinessBody); err != nil {
+		t.Fatalf("decode readiness body: %v", err)
+	}
+	if blocked, _ := readinessBody["blocked"].(bool); !blocked {
+		t.Fatalf("expected blocked readiness, got %v", readinessBody["blocked"])
+	}
+
+	pushResp := httptest.NewRecorder()
+	pushReq, _ := http.NewRequest(http.MethodPost, "/api/sync/push", nil)
+	router.ServeHTTP(pushResp, pushReq)
+	if pushResp.Code != http.StatusLocked {
+		t.Fatalf("expected 423 for blocked sync push, got %d body=%s", pushResp.Code, pushResp.Body.String())
+	}
+
+	var pushBody map[string]any
+	if err := json.Unmarshal(pushResp.Body.Bytes(), &pushBody); err != nil {
+		t.Fatalf("decode push body: %v", err)
+	}
+	if pushBody["reason_text"] == nil || pushBody["reason_text"] == "" {
+		t.Fatalf("expected reason_text in blocked response, got %v", pushBody)
+	}
+}

internal/handlers/web.go

@@ -67,7 +67,7 @@ func NewWebHandler(templatesPath string, componentService *services.ComponentSer
 	}
 
 	// Load each page template with base
-	simplePages := []string{"login.html", "configs.html", "admin_pricing.html", "pricelists.html", "pricelist_detail.html"}
+	simplePages := []string{"login.html", "configs.html", "projects.html", "project_detail.html", "pricelists.html", "pricelist_detail.html"}
 	for _, page := range simplePages {
 		pagePath := filepath.Join(templatesPath, page)
 		var tmpl *template.Template
@@ -186,8 +186,15 @@ func (h *WebHandler) Configs(c *gin.Context) {
 	h.render(c, "configs.html", gin.H{"ActivePage": "configs"})
 }
 
-func (h *WebHandler) AdminPricing(c *gin.Context) {
-	h.render(c, "admin_pricing.html", gin.H{"ActivePage": "admin"})
+func (h *WebHandler) Projects(c *gin.Context) {
+	h.render(c, "projects.html", gin.H{"ActivePage": "projects"})
+}
+
+func (h *WebHandler) ProjectDetail(c *gin.Context) {
+	h.render(c, "project_detail.html", gin.H{
+		"ActivePage":  "projects",
+		"ProjectUUID": c.Param("uuid"),
+	})
 }
 
 func (h *WebHandler) Pricelists(c *gin.Context) {

internal/localdb/components.go

@@ -28,14 +28,13 @@ type ComponentSyncResult struct {
 func (l *LocalDB) SyncComponents(mariaDB *gorm.DB) (*ComponentSyncResult, error) {
 	startTime := time.Now()
 
-	// Query to join lot with qt_lot_metadata
+	// Query to join lot with qt_lot_metadata (metadata only, no pricing)
 	// Use LEFT JOIN to include lots without metadata
 	type componentRow struct {
 		LotName        string
 		LotDescription string
 		Category       *string
 		Model          *string
-		CurrentPrice   *float64
 	}
 
 	var rows []componentRow
@@ -44,8 +43,7 @@ func (l *LocalDB) SyncComponents(mariaDB *gorm.DB) (*ComponentSyncResult, error)
 			l.lot_name,
 			l.lot_description,
 			COALESCE(c.code, SUBSTRING_INDEX(l.lot_name, '_', 1)) as category,
-			m.model,
-			m.current_price
+			m.model
 		FROM lot l
 		LEFT JOIN qt_lot_metadata m ON l.lot_name = m.lot_name
 		LEFT JOIN qt_categories c ON m.category_id = c.id
@@ -100,8 +98,6 @@ func (l *LocalDB) SyncComponents(mariaDB *gorm.DB) (*ComponentSyncResult, error)
 			LotDescription: row.LotDescription,
 			Category:       category,
 			Model:          model,
-			CurrentPrice:   row.CurrentPrice,
-			SyncedAt:       syncTime,
 		}
 		components = append(components, comp)
 
@@ -221,11 +217,6 @@ func (l *LocalDB) ListComponents(filter ComponentFilter, offset, limit int) ([]L
 		)
 	}
 
-	// Apply price filter
-	if filter.HasPrice {
-		db = db.Where("current_price IS NOT NULL")
-	}
-
 	// Get total count
 	var total int64
 	if err := db.Model(&LocalComponent{}).Count(&total).Error; err != nil {
@@ -312,99 +303,3 @@ func (l *LocalDB) NeedComponentSync(maxAgeHours int) bool {
 	return time.Since(*syncTime).Hours() > float64(maxAgeHours)
 }
 
-// UpdateComponentPricesFromPricelist updates current_price in local_components from pricelist items
-// This allows offline price updates using synced pricelists without MariaDB connection
-func (l *LocalDB) UpdateComponentPricesFromPricelist(pricelistID uint) (int, error) {
-	// Get all items from the specified pricelist
-	var items []LocalPricelistItem
-	if err := l.db.Where("pricelist_id = ?", pricelistID).Find(&items).Error; err != nil {
-		return 0, fmt.Errorf("fetching pricelist items: %w", err)
-	}
-
-	if len(items) == 0 {
-		slog.Warn("no items found in pricelist", "pricelist_id", pricelistID)
-		return 0, nil
-	}
-
-	// Update current_price for each component
-	updated := 0
-	err := l.db.Transaction(func(tx *gorm.DB) error {
-		for _, item := range items {
-			result := tx.Model(&LocalComponent{}).
-				Where("lot_name = ?", item.LotName).
-				Update("current_price", item.Price)
-
-			if result.Error != nil {
-				return fmt.Errorf("updating price for %s: %w", item.LotName, result.Error)
-			}
-
-			if result.RowsAffected > 0 {
-				updated++
-			}
-		}
-		return nil
-	})
-
-	if err != nil {
-		return 0, err
-	}
-
-	slog.Info("updated component prices from pricelist",
-		"pricelist_id", pricelistID,
-		"total_items", len(items),
-		"updated_components", updated)
-
-	return updated, nil
-}
-
-// EnsureComponentPricesFromPricelists loads prices from the latest pricelist into local_components
-// if no components exist or all current prices are NULL
-func (l *LocalDB) EnsureComponentPricesFromPricelists() error {
-	// Check if we have any components with prices
-	var count int64
-	if err := l.db.Model(&LocalComponent{}).Where("current_price IS NOT NULL").Count(&count).Error; err != nil {
-		return fmt.Errorf("checking component prices: %w", err)
-	}
-
-	// If we have components with prices, don't load from pricelists
-	if count > 0 {
-		return nil
-	}
-
-	// Check if we have any components at all
-	var totalComponents int64
-	if err := l.db.Model(&LocalComponent{}).Count(&totalComponents).Error; err != nil {
-		return fmt.Errorf("counting components: %w", err)
-	}
-
-	// If we have no components, we need to load them from pricelists
-	if totalComponents == 0 {
-		slog.Info("no components found in local database, loading from latest pricelist")
-		// This would typically be called from the sync service or setup process
-		// For now, we'll just return nil to indicate no action needed
-		return nil
-	}
-
-	// If we have components but no prices, we should load prices from pricelists
-	// Find the latest pricelist
-	var latestPricelist LocalPricelist
-	if err := l.db.Order("created_at DESC").First(&latestPricelist).Error; err != nil {
-		if err == gorm.ErrRecordNotFound {
-			slog.Warn("no pricelists found in local database")
-			return nil
-		}
-		return fmt.Errorf("finding latest pricelist: %w", err)
-	}
-
-	// Update prices from the latest pricelist
-	updated, err := l.UpdateComponentPricesFromPricelist(latestPricelist.ID)
-	if err != nil {
-		return fmt.Errorf("updating component prices from pricelist: %w", err)
-	}
-
-	slog.Info("loaded component prices from latest pricelist",
-		"pricelist_id", latestPricelist.ID,
-		"updated_components", updated)
-
-	return nil
-}

internal/localdb/converters.go

@@ -18,19 +18,28 @@ func ConfigurationToLocal(cfg *models.Configuration) *LocalConfiguration {
 	}
 
 	local := &LocalConfiguration{
-		UUID:           cfg.UUID,
-		Name:           cfg.Name,
-		Items:          items,
-		TotalPrice:     cfg.TotalPrice,
-		CustomPrice:    cfg.CustomPrice,
-		Notes:          cfg.Notes,
-		IsTemplate:     cfg.IsTemplate,
-		ServerCount:    cfg.ServerCount,
-		PriceUpdatedAt: cfg.PriceUpdatedAt,
-		CreatedAt:      cfg.CreatedAt,
-		UpdatedAt:      time.Now(),
-		SyncStatus:     "pending",
-		OriginalUserID: cfg.UserID,
+		UUID:             cfg.UUID,
+		ProjectUUID:      cfg.ProjectUUID,
+		IsActive:         true,
+		Name:             cfg.Name,
+		Items:            items,
+		TotalPrice:       cfg.TotalPrice,
+		CustomPrice:      cfg.CustomPrice,
+		Notes:            cfg.Notes,
+		IsTemplate:       cfg.IsTemplate,
+		ServerCount:      cfg.ServerCount,
+		PricelistID:      cfg.PricelistID,
+		OnlyInStock:      cfg.OnlyInStock,
+		PriceUpdatedAt:   cfg.PriceUpdatedAt,
+		CreatedAt:        cfg.CreatedAt,
+		UpdatedAt:        time.Now(),
+		SyncStatus:       "pending",
+		OriginalUserID:   derefUint(cfg.UserID),
+		OriginalUsername: cfg.OwnerUsername,
+	}
+
+	if local.OriginalUsername == "" && cfg.User != nil {
+		local.OriginalUsername = cfg.User.Username
 	}
 
 	if cfg.ID > 0 {
@@ -54,7 +63,8 @@ func LocalToConfiguration(local *LocalConfiguration) *models.Configuration {
 
 	cfg := &models.Configuration{
 		UUID:           local.UUID,
-		UserID:         local.OriginalUserID,
+		OwnerUsername:  local.OriginalUsername,
+		ProjectUUID:    local.ProjectUUID,
 		Name:           local.Name,
 		Items:          items,
 		TotalPrice:     local.TotalPrice,
@@ -62,6 +72,8 @@ func LocalToConfiguration(local *LocalConfiguration) *models.Configuration {
 		Notes:          local.Notes,
 		IsTemplate:     local.IsTemplate,
 		ServerCount:    local.ServerCount,
+		PricelistID:    local.PricelistID,
+		OnlyInStock:    local.OnlyInStock,
 		PriceUpdatedAt: local.PriceUpdatedAt,
 		CreatedAt:      local.CreatedAt,
 	}
@@ -69,10 +81,57 @@ func LocalToConfiguration(local *LocalConfiguration) *models.Configuration {
 	if local.ServerID != nil {
 		cfg.ID = *local.ServerID
 	}
+	if local.OriginalUserID != 0 {
+		userID := local.OriginalUserID
+		cfg.UserID = &userID
+	}
 
 	return cfg
 }
 
+func derefUint(v *uint) uint {
+	if v == nil {
+		return 0
+	}
+	return *v
+}
+
+func ProjectToLocal(project *models.Project) *LocalProject {
+	local := &LocalProject{
+		UUID:          project.UUID,
+		OwnerUsername: project.OwnerUsername,
+		Name:          project.Name,
+		TrackerURL:    project.TrackerURL,
+		IsActive:      project.IsActive,
+		IsSystem:      project.IsSystem,
+		CreatedAt:     project.CreatedAt,
+		UpdatedAt:     project.UpdatedAt,
+		SyncStatus:    "pending",
+	}
+	if project.ID > 0 {
+		serverID := project.ID
+		local.ServerID = &serverID
+	}
+	return local
+}
+
+func LocalToProject(local *LocalProject) *models.Project {
+	project := &models.Project{
+		UUID:          local.UUID,
+		OwnerUsername: local.OwnerUsername,
+		Name:          local.Name,
+		TrackerURL:    local.TrackerURL,
+		IsActive:      local.IsActive,
+		IsSystem:      local.IsSystem,
+		CreatedAt:     local.CreatedAt,
+		UpdatedAt:     local.UpdatedAt,
+	}
+	if local.ServerID != nil {
+		project.ID = *local.ServerID
+	}
+	return project
+}
+
 // PricelistToLocal converts models.Pricelist to LocalPricelist
 func PricelistToLocal(pl *models.Pricelist) *LocalPricelist {
 	name := pl.Notification
@@ -82,6 +141,7 @@ func PricelistToLocal(pl *models.Pricelist) *LocalPricelist {
 
 	return &LocalPricelist{
 		ServerID:  pl.ID,
+		Source:    pl.Source,
 		Version:   pl.Version,
 		Name:      name,
 		CreatedAt: pl.CreatedAt,
@@ -94,6 +154,7 @@ func PricelistToLocal(pl *models.Pricelist) *LocalPricelist {
 func LocalToPricelist(local *LocalPricelist) *models.Pricelist {
 	return &models.Pricelist{
 		ID:           local.ServerID,
+		Source:       local.Source,
 		Version:      local.Version,
 		Notification: local.Name,
 		CreatedAt:    local.CreatedAt,
@@ -103,20 +164,28 @@ func LocalToPricelist(local *LocalPricelist) *models.Pricelist {
 
 // PricelistItemToLocal converts models.PricelistItem to LocalPricelistItem
 func PricelistItemToLocal(item *models.PricelistItem, localPricelistID uint) *LocalPricelistItem {
+	partnumbers := make(LocalStringList, 0, len(item.Partnumbers))
+	partnumbers = append(partnumbers, item.Partnumbers...)
 	return &LocalPricelistItem{
-		PricelistID: localPricelistID,
-		LotName:     item.LotName,
-		Price:       item.Price,
+		PricelistID:  localPricelistID,
+		LotName:      item.LotName,
+		Price:        item.Price,
+		AvailableQty: item.AvailableQty,
+		Partnumbers:  partnumbers,
 	}
 }
 
 // LocalToPricelistItem converts LocalPricelistItem to models.PricelistItem
 func LocalToPricelistItem(local *LocalPricelistItem, serverPricelistID uint) *models.PricelistItem {
+	partnumbers := make([]string, 0, len(local.Partnumbers))
+	partnumbers = append(partnumbers, local.Partnumbers...)
 	return &models.PricelistItem{
-		ID:          local.ID,
-		PricelistID: serverPricelistID,
-		LotName:     local.LotName,
-		Price:       local.Price,
+		ID:           local.ID,
+		PricelistID:  serverPricelistID,
+		LotName:      local.LotName,
+		Price:        local.Price,
+		AvailableQty: local.AvailableQty,
+		Partnumbers:  partnumbers,
 	}
 }
 
@@ -144,17 +213,14 @@ func ComponentToLocal(meta *models.LotMetadata) *LocalComponent {
 		LotDescription: lotDesc,
 		Category:       category,
 		Model:          meta.Model,
-		CurrentPrice:   meta.CurrentPrice,
-		SyncedAt:       time.Now(),
 	}
 }
 
 // LocalToComponent converts LocalComponent to models.LotMetadata
 func LocalToComponent(local *LocalComponent) *models.LotMetadata {
 	return &models.LotMetadata{
-		LotName:      local.LotName,
-		Model:        local.Model,
-		CurrentPrice: local.CurrentPrice,
+		LotName: local.LotName,
+		Model:   local.Model,
 		Lot: &models.Lot{
 			LotName:        local.LotName,
 			LotDescription: local.LotDescription,

internal/localdb/local_migrations_test.go

@@ -0,0 +1,127 @@
+package localdb
+
+import (
+	"path/filepath"
+	"testing"
+	"time"
+)
+
+func TestRunLocalMigrationsBackfillsExistingConfigurations(t *testing.T) {
+	dbPath := filepath.Join(t.TempDir(), "legacy_local.db")
+
+	local, err := New(dbPath)
+	if err != nil {
+		t.Fatalf("open localdb: %v", err)
+	}
+	t.Cleanup(func() { _ = local.Close() })
+
+	cfg := &LocalConfiguration{
+		UUID:             "legacy-cfg",
+		Name:             "Legacy",
+		Items:            LocalConfigItems{},
+		SyncStatus:       "pending",
+		OriginalUsername: "tester",
+		IsActive:         true,
+	}
+	if err := local.SaveConfiguration(cfg); err != nil {
+		t.Fatalf("save seed config: %v", err)
+	}
+	if err := local.DB().Where("configuration_uuid = ?", "legacy-cfg").Delete(&LocalConfigurationVersion{}).Error; err != nil {
+		t.Fatalf("delete seed versions: %v", err)
+	}
+	if err := local.DB().Model(&LocalConfiguration{}).
+		Where("uuid = ?", "legacy-cfg").
+		Update("current_version_id", nil).Error; err != nil {
+		t.Fatalf("clear current_version_id: %v", err)
+	}
+	if err := local.DB().Where("1=1").Delete(&LocalSchemaMigration{}).Error; err != nil {
+		t.Fatalf("clear migration records: %v", err)
+	}
+
+	if err := runLocalMigrations(local.DB()); err != nil {
+		t.Fatalf("run local migrations manually: %v", err)
+	}
+
+	migratedCfg, err := local.GetConfigurationByUUID("legacy-cfg")
+	if err != nil {
+		t.Fatalf("get migrated config: %v", err)
+	}
+	if migratedCfg.CurrentVersionID == nil || *migratedCfg.CurrentVersionID == "" {
+		t.Fatalf("expected current_version_id after migration")
+	}
+	if !migratedCfg.IsActive {
+		t.Fatalf("expected migrated config to be active")
+	}
+
+	var versionCount int64
+	if err := local.DB().Model(&LocalConfigurationVersion{}).
+		Where("configuration_uuid = ?", "legacy-cfg").
+		Count(&versionCount).Error; err != nil {
+		t.Fatalf("count versions: %v", err)
+	}
+	if versionCount != 1 {
+		t.Fatalf("expected 1 backfilled version, got %d", versionCount)
+	}
+
+	var migrationCount int64
+	if err := local.DB().Model(&LocalSchemaMigration{}).Count(&migrationCount).Error; err != nil {
+		t.Fatalf("count local migrations: %v", err)
+	}
+	if migrationCount == 0 {
+		t.Fatalf("expected local migrations to be recorded")
+	}
+}
+
+func TestRunLocalMigrationsFixesPricelistVersionUniqueIndex(t *testing.T) {
+	dbPath := filepath.Join(t.TempDir(), "pricelist_index_fix.db")
+
+	local, err := New(dbPath)
+	if err != nil {
+		t.Fatalf("open localdb: %v", err)
+	}
+	t.Cleanup(func() { _ = local.Close() })
+
+	if err := local.SaveLocalPricelist(&LocalPricelist{
+		ServerID:  10,
+		Version:   "2026-02-06-001",
+		Name:      "v1",
+		CreatedAt: time.Now().Add(-time.Hour),
+		SyncedAt:  time.Now().Add(-time.Hour),
+	}); err != nil {
+		t.Fatalf("save first pricelist: %v", err)
+	}
+
+	if err := local.DB().Exec(`
+		CREATE UNIQUE INDEX IF NOT EXISTS idx_local_pricelists_version_legacy
+		ON local_pricelists(version)
+	`).Error; err != nil {
+		t.Fatalf("create legacy unique version index: %v", err)
+	}
+
+	if err := local.DB().Where("id = ?", "2026_02_06_pricelist_index_fix").
+		Delete(&LocalSchemaMigration{}).Error; err != nil {
+		t.Fatalf("delete migration record: %v", err)
+	}
+
+	if err := runLocalMigrations(local.DB()); err != nil {
+		t.Fatalf("rerun local migrations: %v", err)
+	}
+
+	if err := local.SaveLocalPricelist(&LocalPricelist{
+		ServerID:  11,
+		Version:   "2026-02-06-001",
+		Name:      "v1-duplicate-version",
+		CreatedAt: time.Now(),
+		SyncedAt:  time.Now(),
+	}); err != nil {
+		t.Fatalf("save second pricelist with duplicate version: %v", err)
+	}
+
+	var count int64
+	if err := local.DB().Model(&LocalPricelist{}).Count(&count).Error; err != nil {
+		t.Fatalf("count pricelists: %v", err)
+	}
+	if count != 2 {
+		t.Fatalf("expected 2 pricelists, got %d", count)
+	}
+}

internal/localdb/localdb.go

@@ -1,14 +1,22 @@
 package localdb
 
 import (
+	"errors"
 	"fmt"
 	"log/slog"
+	"net"
 	"os"
 	"path/filepath"
+	"strconv"
+	"strings"
 	"time"
 
+	"git.mchus.pro/mchus/quoteforge/internal/appmeta"
 	"github.com/glebarez/sqlite"
+	mysqlDriver "github.com/go-sql-driver/mysql"
+	uuidpkg "github.com/google/uuid"
 	"gorm.io/gorm"
+	"gorm.io/gorm/clause"
 	"gorm.io/gorm/logger"
 )
 
@@ -51,15 +59,22 @@ func New(dbPath string) (*LocalDB, error) {
 	// Auto-migrate all local tables
 	if err := db.AutoMigrate(
 		&ConnectionSettings{},
+		&LocalProject{},
 		&LocalConfiguration{},
+		&LocalConfigurationVersion{},
 		&LocalPricelist{},
 		&LocalPricelistItem{},
 		&LocalComponent{},
 		&AppSetting{},
+		&LocalRemoteMigrationApplied{},
+		&LocalSyncGuardState{},
 		&PendingChange{},
 	); err != nil {
 		return nil, fmt.Errorf("migrating sqlite database: %w", err)
 	}
+	if err := runLocalMigrations(db); err != nil {
+		return nil, fmt.Errorf("running local sqlite migrations: %w", err)
+	}
 
 	slog.Info("local SQLite database initialized", "path", dbPath)
 
@@ -132,19 +147,23 @@ func (l *LocalDB) GetDSN() (string, error) {
 		return "", err
 	}
 
-	// Add aggressive timeouts for offline-first architecture
-	// timeout: connection establishment timeout (3s)
-	// readTimeout: I/O read timeout (3s)
-	// writeTimeout: I/O write timeout (3s)
-	dsn := fmt.Sprintf("%s:%s@tcp(%s:%d)/%s?charset=utf8mb4&parseTime=True&loc=Local&timeout=3s&readTimeout=3s&writeTimeout=3s",
-		settings.User,
-		settings.PasswordEncrypted, // Contains decrypted password after GetSettings
-		settings.Host,
-		settings.Port,
-		settings.Database,
-	)
+	cfg := mysqlDriver.NewConfig()
+	cfg.User = settings.User
+	cfg.Passwd = settings.PasswordEncrypted // Contains decrypted password after GetSettings
+	cfg.Net = "tcp"
+	cfg.Addr = net.JoinHostPort(settings.Host, strconv.Itoa(settings.Port))
+	cfg.DBName = settings.Database
+	cfg.ParseTime = true
+	cfg.Loc = time.Local
+	// Add aggressive timeouts for offline-first architecture.
+	cfg.Timeout = 3 * time.Second
+	cfg.ReadTimeout = 3 * time.Second
+	cfg.WriteTimeout = 3 * time.Second
+	cfg.Params = map[string]string{
+		"charset": "utf8mb4",
+	}
 
-	return dsn, nil
+	return cfg.FormatDSN(), nil
 }
 
 // DB returns the underlying gorm.DB for advanced operations
@@ -172,6 +191,216 @@ func (l *LocalDB) GetDBUser() string {
 
 // Configuration methods
 
+// Project methods
+
+func (l *LocalDB) SaveProject(project *LocalProject) error {
+	return l.db.Save(project).Error
+}
+
+func (l *LocalDB) GetProjects(ownerUsername string, includeArchived bool) ([]LocalProject, error) {
+	var projects []LocalProject
+	query := l.db.Model(&LocalProject{}).Where("owner_username = ?", ownerUsername)
+	if !includeArchived {
+		query = query.Where("is_active = ?", true)
+	}
+	err := query.Order("created_at DESC").Find(&projects).Error
+	return projects, err
+}
+
+func (l *LocalDB) GetAllProjects(includeArchived bool) ([]LocalProject, error) {
+	var projects []LocalProject
+	query := l.db.Model(&LocalProject{})
+	if !includeArchived {
+		query = query.Where("is_active = ?", true)
+	}
+	err := query.Order("created_at DESC").Find(&projects).Error
+	return projects, err
+}
+
+func (l *LocalDB) GetProjectByUUID(uuid string) (*LocalProject, error) {
+	var project LocalProject
+	if err := l.db.Where("uuid = ?", uuid).First(&project).Error; err != nil {
+		return nil, err
+	}
+	return &project, nil
+}
+
+func (l *LocalDB) GetProjectByName(ownerUsername, name string) (*LocalProject, error) {
+	var project LocalProject
+	if err := l.db.Where("owner_username = ? AND name = ?", ownerUsername, name).First(&project).Error; err != nil {
+		return nil, err
+	}
+	return &project, nil
+}
+
+func (l *LocalDB) GetProjectConfigurations(projectUUID string) ([]LocalConfiguration, error) {
+	var configs []LocalConfiguration
+	err := l.db.Where("project_uuid = ? AND is_active = ?", projectUUID, true).
+		Order("created_at DESC").
+		Find(&configs).Error
+	return configs, err
+}
+
+func (l *LocalDB) EnsureDefaultProject(ownerUsername string) (*LocalProject, error) {
+	project := &LocalProject{}
+	err := l.db.
+		Where("LOWER(TRIM(COALESCE(name, ''))) = LOWER(?) AND is_system = ?", "Без проекта", true).
+		Order("CASE WHEN TRIM(COALESCE(owner_username, '')) = '' THEN 0 ELSE 1 END, created_at ASC, id ASC").
+		First(project).Error
+	if err == nil {
+		return project, nil
+	}
+	if !errors.Is(err, gorm.ErrRecordNotFound) {
+		return nil, err
+	}
+
+	now := time.Now()
+	project = &LocalProject{
+		UUID:          uuidpkg.NewString(),
+		OwnerUsername: "",
+		Name:          "Без проекта",
+		IsActive:      true,
+		IsSystem:      true,
+		CreatedAt:     now,
+		UpdatedAt:     now,
+		SyncStatus:    "pending",
+	}
+	if err := l.SaveProject(project); err != nil {
+		return nil, err
+	}
+	return project, nil
+}
+
+// ConsolidateSystemProjects merges all "Без проекта" projects into one shared canonical project.
+// Configurations are reassigned to canonical UUID, duplicate projects are deleted.
+func (l *LocalDB) ConsolidateSystemProjects() (int64, error) {
+	var removed int64
+	err := l.db.Transaction(func(tx *gorm.DB) error {
+		var canonical LocalProject
+		err := tx.
+			Where("LOWER(TRIM(COALESCE(name, ''))) = LOWER(?) AND is_system = ?", "Без проекта", true).
+			Order("CASE WHEN TRIM(COALESCE(owner_username, '')) = '' THEN 0 ELSE 1 END, created_at ASC, id ASC").
+			First(&canonical).Error
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			now := time.Now()
+			canonical = LocalProject{
+				UUID:          uuidpkg.NewString(),
+				OwnerUsername: "",
+				Name:          "Без проекта",
+				IsActive:      true,
+				IsSystem:      true,
+				CreatedAt:     now,
+				UpdatedAt:     now,
+				SyncStatus:    "pending",
+			}
+			if err := tx.Create(&canonical).Error; err != nil {
+				return err
+			}
+		} else if err != nil {
+			return err
+		}
+
+		if err := tx.Model(&LocalProject{}).
+			Where("uuid = ?", canonical.UUID).
+			Updates(map[string]any{
+				"name":      "Без проекта",
+				"is_system": true,
+				"is_active": true,
+			}).Error; err != nil {
+			return err
+		}
+
+		var duplicates []LocalProject
+		if err := tx.Where("LOWER(TRIM(COALESCE(name, ''))) = LOWER(?) AND uuid <> ?", "Без проекта", canonical.UUID).
+			Find(&duplicates).Error; err != nil {
+			return err
+		}
+
+		for i := range duplicates {
+			p := duplicates[i]
+			if err := tx.Model(&LocalConfiguration{}).
+				Where("project_uuid = ?", p.UUID).
+				Update("project_uuid", canonical.UUID).Error; err != nil {
+				return err
+			}
+
+			// Remove stale pending project events for deleted UUIDs.
+			if err := tx.Where("entity_type = ? AND entity_uuid = ?", "project", p.UUID).
+				Delete(&PendingChange{}).Error; err != nil {
+				return err
+			}
+
+			res := tx.Where("uuid = ?", p.UUID).Delete(&LocalProject{})
+			if res.Error != nil {
+				return res.Error
+			}
+			removed += res.RowsAffected
+		}
+
+		// Backfill orphaned local configurations to canonical project.
+		if err := tx.Model(&LocalConfiguration{}).
+			Where("project_uuid IS NULL OR TRIM(COALESCE(project_uuid, '')) = ''").
+			Update("project_uuid", canonical.UUID).Error; err != nil {
+			return err
+		}
+
+		return nil
+	})
+	return removed, err
+}
+
+// PurgeEmptyNamelessProjects removes service-trash projects that have no linked configurations:
+// 1) projects with empty names;
+// 2) duplicate "Без проекта" rows without configurations (case-insensitive, trimmed).
+func (l *LocalDB) PurgeEmptyNamelessProjects() (int64, error) {
+	tx := l.db.Exec(`
+DELETE FROM local_projects
+WHERE (
+      TRIM(COALESCE(name, '')) = ''
+      OR LOWER(TRIM(COALESCE(name, ''))) = LOWER('Без проекта')
+)
+  AND uuid NOT IN (
+      SELECT DISTINCT project_uuid
+      FROM local_configurations
+      WHERE project_uuid IS NOT NULL AND project_uuid <> ''
+  )`)
+	return tx.RowsAffected, tx.Error
+}
+
+// BackfillConfigurationProjects ensures every configuration has project_uuid set.
+// If missing, it assigns system project "Без проекта" for configuration owner.
+func (l *LocalDB) BackfillConfigurationProjects(defaultOwner string) error {
+	configs, err := l.GetConfigurations()
+	if err != nil {
+		return err
+	}
+
+	for i := range configs {
+		cfg := configs[i]
+		if cfg.ProjectUUID != nil && *cfg.ProjectUUID != "" {
+			continue
+		}
+		owner := strings.TrimSpace(cfg.OriginalUsername)
+		if owner == "" {
+			owner = strings.TrimSpace(defaultOwner)
+		}
+		if owner == "" {
+			continue
+		}
+
+		project, err := l.EnsureDefaultProject(owner)
+		if err != nil {
+			return err
+		}
+
+		cfg.ProjectUUID = &project.UUID
+		if saveErr := l.SaveConfiguration(&cfg); saveErr != nil {
+			return saveErr
+		}
+	}
+	return nil
+}
+
 // SaveConfiguration saves a configuration to local SQLite
 func (l *LocalDB) SaveConfiguration(config *LocalConfiguration) error {
 	return l.db.Save(config).Error
@@ -191,9 +420,93 @@ func (l *LocalDB) GetConfigurationByUUID(uuid string) (*LocalConfiguration, erro
 	return &config, err
 }
 
+// ListConfigurationsWithFilters returns configurations with DB-level filtering and pagination.
+func (l *LocalDB) ListConfigurationsWithFilters(status string, search string, offset, limit int) ([]LocalConfiguration, int64, error) {
+	query := l.db.Model(&LocalConfiguration{})
+	switch status {
+	case "active":
+		query = query.Where("is_active = ?", true)
+	case "archived":
+		query = query.Where("is_active = ?", false)
+	case "all", "":
+		// no-op
+	default:
+		query = query.Where("is_active = ?", true)
+	}
+
+	search = strings.TrimSpace(search)
+	if search != "" {
+		query = query.Where("LOWER(name) LIKE ?", "%"+strings.ToLower(search)+"%")
+	}
+
+	var total int64
+	if err := query.Count(&total).Error; err != nil {
+		return nil, 0, err
+	}
+
+	var configs []LocalConfiguration
+	if err := query.Order("created_at DESC").Offset(offset).Limit(limit).Find(&configs).Error; err != nil {
+		return nil, 0, err
+	}
+	return configs, total, nil
+}
+
 // DeleteConfiguration deletes a configuration by UUID
 func (l *LocalDB) DeleteConfiguration(uuid string) error {
-	return l.db.Where("uuid = ?", uuid).Delete(&LocalConfiguration{}).Error
+	return l.DeactivateConfiguration(uuid)
+}
+
+// DeactivateConfiguration marks configuration as inactive and appends one snapshot version.
+func (l *LocalDB) DeactivateConfiguration(uuid string) error {
+	return l.db.Transaction(func(tx *gorm.DB) error {
+		var cfg LocalConfiguration
+		if err := tx.Where("uuid = ?", uuid).First(&cfg).Error; err != nil {
+			return err
+		}
+		if !cfg.IsActive {
+			return nil
+		}
+
+		cfg.IsActive = false
+		cfg.UpdatedAt = time.Now()
+		cfg.SyncStatus = "pending"
+		if err := tx.Save(&cfg).Error; err != nil {
+			return fmt.Errorf("save inactive configuration: %w", err)
+		}
+
+		var maxVersion int
+		if err := tx.Model(&LocalConfigurationVersion{}).
+			Where("configuration_uuid = ?", cfg.UUID).
+			Select("COALESCE(MAX(version_no), 0)").
+			Scan(&maxVersion).Error; err != nil {
+			return fmt.Errorf("read max version for deactivate: %w", err)
+		}
+
+		snapshot, err := BuildConfigurationSnapshot(&cfg)
+		if err != nil {
+			return fmt.Errorf("build deactivate snapshot: %w", err)
+		}
+		note := "deactivate via local delete"
+		version := &LocalConfigurationVersion{
+			ID:                uuidpkg.NewString(),
+			ConfigurationUUID: cfg.UUID,
+			VersionNo:         maxVersion + 1,
+			Data:              snapshot,
+			ChangeNote:        &note,
+			AppVersion:        appmeta.Version(),
+			CreatedAt:         time.Now(),
+		}
+		if err := tx.Create(version).Error; err != nil {
+			return fmt.Errorf("insert deactivate version: %w", err)
+		}
+		if err := tx.Model(&LocalConfiguration{}).
+			Where("uuid = ?", cfg.UUID).
+			Update("current_version_id", version.ID).Error; err != nil {
+			return fmt.Errorf("set current version after deactivate: %w", err)
+		}
+
+		return nil
+	})
 }
 
 // CountConfigurations returns the number of local configurations
@@ -203,6 +516,13 @@ func (l *LocalDB) CountConfigurations() int64 {
 	return count
 }
 
+// CountProjects returns the number of local projects
+func (l *LocalDB) CountProjects() int64 {
+	var count int64
+	l.db.Model(&LocalProject{}).Count(&count)
+	return count
+}
+
 // Pricelist methods
 
 // GetLastSyncTime returns the last sync timestamp
@@ -243,7 +563,16 @@ func (l *LocalDB) CountLocalPricelists() int64 {
 // GetLatestLocalPricelist returns the most recently synced pricelist
 func (l *LocalDB) GetLatestLocalPricelist() (*LocalPricelist, error) {
 	var pricelist LocalPricelist
-	if err := l.db.Order("created_at DESC").First(&pricelist).Error; err != nil {
+	if err := l.db.Where("source = ?", "estimate").Order("created_at DESC").First(&pricelist).Error; err != nil {
+		return nil, err
+	}
+	return &pricelist, nil
+}
+
+// GetLatestLocalPricelistBySource returns the most recently synced pricelist for a source.
+func (l *LocalDB) GetLatestLocalPricelistBySource(source string) (*LocalPricelist, error) {
+	var pricelist LocalPricelist
+	if err := l.db.Where("source = ?", source).Order("created_at DESC").First(&pricelist).Error; err != nil {
 		return nil, err
 	}
 	return &pricelist, nil
@@ -258,6 +587,24 @@ func (l *LocalDB) GetLocalPricelistByServerID(serverID uint) (*LocalPricelist, e
 	return &pricelist, nil
 }
 
+// GetLocalPricelistByVersion returns a local pricelist by version string.
+func (l *LocalDB) GetLocalPricelistByVersion(version string) (*LocalPricelist, error) {
+	var pricelist LocalPricelist
+	if err := l.db.Where("version = ? AND source = ?", version, "estimate").First(&pricelist).Error; err != nil {
+		return nil, err
+	}
+	return &pricelist, nil
+}
+
+// GetLocalPricelistBySourceAndVersion returns a local pricelist by source and version string.
+func (l *LocalDB) GetLocalPricelistBySourceAndVersion(source, version string) (*LocalPricelist, error) {
+	var pricelist LocalPricelist
+	if err := l.db.Where("source = ? AND version = ?", source, version).First(&pricelist).Error; err != nil {
+		return nil, err
+	}
+	return &pricelist, nil
+}
+
 // GetLocalPricelistByID returns a local pricelist by its local ID
 func (l *LocalDB) GetLocalPricelistByID(id uint) (*LocalPricelist, error) {
 	var pricelist LocalPricelist
@@ -269,7 +616,17 @@ func (l *LocalDB) GetLocalPricelistByID(id uint) (*LocalPricelist, error) {
 
 // SaveLocalPricelist saves a pricelist to local SQLite
 func (l *LocalDB) SaveLocalPricelist(pricelist *LocalPricelist) error {
-	return l.db.Save(pricelist).Error
+	return l.db.Clauses(clause.OnConflict{
+		Columns: []clause.Column{{Name: "server_id"}},
+		DoUpdates: clause.Assignments(map[string]interface{}{
+			"source":     pricelist.Source,
+			"version":    pricelist.Version,
+			"name":       pricelist.Name,
+			"created_at": pricelist.CreatedAt,
+			"synced_at":  pricelist.SyncedAt,
+			"is_used":    pricelist.IsUsed,
+		}),
+	}).Create(pricelist).Error
 }
 
 // GetLocalPricelists returns all local pricelists
@@ -333,6 +690,25 @@ func (l *LocalDB) MarkPricelistAsUsed(pricelistID uint, isUsed bool) error {
 		Update("is_used", isUsed).Error
 }
 
+// RecalculateAllLocalPricelistUsage refreshes local_pricelists.is_used based on active configurations.
+func (l *LocalDB) RecalculateAllLocalPricelistUsage() error {
+	return l.db.Transaction(func(tx *gorm.DB) error {
+		if err := tx.Model(&LocalPricelist{}).Where("1 = 1").Update("is_used", false).Error; err != nil {
+			return err
+		}
+
+		return tx.Exec(`
+			UPDATE local_pricelists
+			SET is_used = 1
+			WHERE server_id IN (
+				SELECT DISTINCT pricelist_id
+				FROM local_configurations
+				WHERE pricelist_id IS NOT NULL AND is_active = 1
+			)
+		`).Error
+	})
+}
+
 // DeleteLocalPricelist deletes a pricelist and its items
 func (l *LocalDB) DeleteLocalPricelist(id uint) error {
 	// Delete items first
@@ -343,6 +719,47 @@ func (l *LocalDB) DeleteLocalPricelist(id uint) error {
 	return l.db.Delete(&LocalPricelist{}, id).Error
 }
 
+// DeleteUnusedLocalPricelistsMissingOnServer removes local pricelists that are absent on server
+// and not referenced by active local configurations.
+func (l *LocalDB) DeleteUnusedLocalPricelistsMissingOnServer(serverPricelistIDs []uint) (int, error) {
+	returned := 0
+	err := l.db.Transaction(func(tx *gorm.DB) error {
+		var candidates []LocalPricelist
+		query := tx.Model(&LocalPricelist{})
+		if len(serverPricelistIDs) > 0 {
+			query = query.Where("server_id NOT IN ?", serverPricelistIDs)
+		}
+		if err := query.Find(&candidates).Error; err != nil {
+			return err
+		}
+
+		for i := range candidates {
+			pl := candidates[i]
+			var refs int64
+			if err := tx.Model(&LocalConfiguration{}).
+				Where("pricelist_id = ? AND is_active = 1", pl.ServerID).
+				Count(&refs).Error; err != nil {
+				return err
+			}
+			if refs > 0 {
+				continue
+			}
+			if err := tx.Where("pricelist_id = ?", pl.ID).Delete(&LocalPricelistItem{}).Error; err != nil {
+				return err
+			}
+			if err := tx.Delete(&LocalPricelist{}, pl.ID).Error; err != nil {
+				return err
+			}
+			returned++
+		}
+		return nil
+	})
+	if err != nil {
+		return 0, err
+	}
+	return returned, nil
+}
+
 // PendingChange methods
 
 // AddPendingChange adds a change to the sync queue
@@ -415,7 +832,85 @@ func (l *LocalDB) MarkChangesSynced(ids []int64) error {
 	return l.db.Where("id IN ?", ids).Delete(&PendingChange{}).Error
 }
 
+// PurgeOrphanConfigurationPendingChanges removes configuration pending changes
+// whose entity_uuid no longer exists in local_configurations.
+func (l *LocalDB) PurgeOrphanConfigurationPendingChanges() (int64, error) {
+	tx := l.db.Where(
+		"entity_type = ? AND entity_uuid NOT IN (SELECT uuid FROM local_configurations)",
+		"configuration",
+	).Delete(&PendingChange{})
+	return tx.RowsAffected, tx.Error
+}
+
 // GetPendingCount returns the total number of pending changes (alias for CountPendingChanges)
 func (l *LocalDB) GetPendingCount() int64 {
 	return l.CountPendingChanges()
 }
+
+// GetRemoteMigrationApplied returns a locally applied remote migration by ID.
+func (l *LocalDB) GetRemoteMigrationApplied(id string) (*LocalRemoteMigrationApplied, error) {
+	var migration LocalRemoteMigrationApplied
+	if err := l.db.Where("id = ?", id).First(&migration).Error; err != nil {
+		return nil, err
+	}
+	return &migration, nil
+}
+
+// UpsertRemoteMigrationApplied writes applied migration metadata.
+func (l *LocalDB) UpsertRemoteMigrationApplied(id, checksum, appVersion string, appliedAt time.Time) error {
+	record := &LocalRemoteMigrationApplied{
+		ID:         id,
+		Checksum:   checksum,
+		AppVersion: appVersion,
+		AppliedAt:  appliedAt,
+	}
+	return l.db.Clauses(clause.OnConflict{
+		Columns: []clause.Column{{Name: "id"}},
+		DoUpdates: clause.Assignments(map[string]interface{}{
+			"checksum":    checksum,
+			"app_version": appVersion,
+			"applied_at":  appliedAt,
+		}),
+	}).Create(record).Error
+}
+
+// GetLatestAppliedRemoteMigrationID returns last applied remote migration id.
+func (l *LocalDB) GetLatestAppliedRemoteMigrationID() (string, error) {
+	var record LocalRemoteMigrationApplied
+	if err := l.db.Order("applied_at DESC").First(&record).Error; err != nil {
+		return "", err
+	}
+	return record.ID, nil
+}
+
+// GetSyncGuardState returns the latest readiness guard state.
+func (l *LocalDB) GetSyncGuardState() (*LocalSyncGuardState, error) {
+	var state LocalSyncGuardState
+	if err := l.db.Order("id DESC").First(&state).Error; err != nil {
+		return nil, err
+	}
+	return &state, nil
+}
+
+// SetSyncGuardState upserts readiness guard state (single-row logical table).
+func (l *LocalDB) SetSyncGuardState(status, reasonCode, reasonText string, requiredMinAppVersion *string, checkedAt *time.Time) error {
+	state := &LocalSyncGuardState{
+		ID:                    1,
+		Status:                status,
+		ReasonCode:            reasonCode,
+		ReasonText:            reasonText,
+		RequiredMinAppVersion: requiredMinAppVersion,
+		LastCheckedAt:         checkedAt,
+	}
+	return l.db.Clauses(clause.OnConflict{
+		Columns: []clause.Column{{Name: "id"}},
+		DoUpdates: clause.Assignments(map[string]interface{}{
+			"status":                   status,
+			"reason_code":              reasonCode,
+			"reason_text":              reasonText,
+			"required_min_app_version": requiredMinAppVersion,
+			"last_checked_at":          checkedAt,
+			"updated_at":               time.Now(),
+		}),
+	}).Create(state).Error
+}

internal/localdb/migration_projects_test.go

@@ -0,0 +1,60 @@
+package localdb
+
+import (
+	"path/filepath"
+	"testing"
+)
+
+func TestRunLocalMigrationsBackfillsDefaultProject(t *testing.T) {
+	dbPath := filepath.Join(t.TempDir(), "projects_backfill.db")
+
+	local, err := New(dbPath)
+	if err != nil {
+		t.Fatalf("open localdb: %v", err)
+	}
+	t.Cleanup(func() { _ = local.Close() })
+
+	cfg := &LocalConfiguration{
+		UUID:             "cfg-without-project",
+		Name:             "Cfg no project",
+		Items:            LocalConfigItems{},
+		SyncStatus:       "pending",
+		OriginalUsername: "tester",
+		IsActive:         true,
+	}
+	if err := local.SaveConfiguration(cfg); err != nil {
+		t.Fatalf("save config: %v", err)
+	}
+	if err := local.DB().
+		Model(&LocalConfiguration{}).
+		Where("uuid = ?", cfg.UUID).
+		Update("project_uuid", nil).Error; err != nil {
+		t.Fatalf("clear project_uuid: %v", err)
+	}
+	if err := local.DB().Where("id = ?", "2026_02_06_projects_backfill").Delete(&LocalSchemaMigration{}).Error; err != nil {
+		t.Fatalf("delete local migration record: %v", err)
+	}
+
+	if err := runLocalMigrations(local.DB()); err != nil {
+		t.Fatalf("run local migrations: %v", err)
+	}
+
+	updated, err := local.GetConfigurationByUUID(cfg.UUID)
+	if err != nil {
+		t.Fatalf("get updated config: %v", err)
+	}
+	if updated.ProjectUUID == nil || *updated.ProjectUUID == "" {
+		t.Fatalf("expected project_uuid to be backfilled")
+	}
+
+	project, err := local.GetProjectByUUID(*updated.ProjectUUID)
+	if err != nil {
+		t.Fatalf("get system project: %v", err)
+	}
+	if project.Name != "Без проекта" {
+		t.Fatalf("expected system project name, got %q", project.Name)
+	}
+	if !project.IsSystem {
+		t.Fatalf("expected system project flag")
+	}
+}

internal/localdb/migration_versioning_test.go

@@ -0,0 +1,131 @@
+package localdb
+
+import (
+	"encoding/json"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/glebarez/sqlite"
+	"gorm.io/gorm"
+)
+
+func TestMigration006BackfillCreatesV1AndCurrentPointer(t *testing.T) {
+	dbPath := filepath.Join(t.TempDir(), "migration_backfill.db")
+	db, err := gorm.Open(sqlite.Open(dbPath), &gorm.Config{})
+	if err != nil {
+		t.Fatalf("open sqlite: %v", err)
+	}
+
+	if err := db.Exec(`
+CREATE TABLE local_configurations (
+	id INTEGER PRIMARY KEY AUTOINCREMENT,
+	uuid TEXT NOT NULL UNIQUE,
+	server_id INTEGER NULL,
+	name TEXT NOT NULL,
+	items TEXT,
+	total_price REAL,
+	custom_price REAL,
+	notes TEXT,
+	is_template BOOLEAN DEFAULT FALSE,
+	server_count INTEGER DEFAULT 1,
+	price_updated_at DATETIME NULL,
+	created_at DATETIME,
+	updated_at DATETIME,
+	synced_at DATETIME,
+	sync_status TEXT DEFAULT 'local',
+	original_user_id INTEGER DEFAULT 0,
+	original_username TEXT DEFAULT ''
+);`).Error; err != nil {
+		t.Fatalf("create pre-migration schema: %v", err)
+	}
+
+	items := `[{"lot_name":"CPU_X","quantity":2,"unit_price":1000}]`
+	now := time.Now().UTC().Format(time.RFC3339)
+	if err := db.Exec(`
+INSERT INTO local_configurations
+	(uuid, name, items, total_price, notes, server_count, created_at, updated_at, sync_status, original_username)
+VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
+		"cfg-1", "Cfg One", items, 2000.0, "note", 1, now, now, "pending", "tester",
+	).Error; err != nil {
+		t.Fatalf("seed pre-migration data: %v", err)
+	}
+
+	migrationPath := filepath.Join("..", "..", "migrations", "006_add_local_configuration_versions.sql")
+	sqlBytes, err := os.ReadFile(migrationPath)
+	if err != nil {
+		t.Fatalf("read migration file: %v", err)
+	}
+	if err := execSQLScript(db, string(sqlBytes)); err != nil {
+		t.Fatalf("apply migration: %v", err)
+	}
+
+	var count int64
+	if err := db.Table("local_configuration_versions").Where("configuration_uuid = ?", "cfg-1").Count(&count).Error; err != nil {
+		t.Fatalf("count versions: %v", err)
+	}
+	if count != 1 {
+		t.Fatalf("expected 1 version, got %d", count)
+	}
+
+	var currentVersionID *string
+	if err := db.Table("local_configurations").Select("current_version_id").Where("uuid = ?", "cfg-1").Scan(&currentVersionID).Error; err != nil {
+		t.Fatalf("read current_version_id: %v", err)
+	}
+	if currentVersionID == nil || *currentVersionID == "" {
+		t.Fatalf("expected current_version_id to be set")
+	}
+
+	var row struct {
+		ID        string
+		VersionNo int
+		Data      string
+	}
+	if err := db.Table("local_configuration_versions").
+		Select("id, version_no, data").
+		Where("configuration_uuid = ?", "cfg-1").
+		First(&row).Error; err != nil {
+		t.Fatalf("load v1 row: %v", err)
+	}
+	if row.VersionNo != 1 {
+		t.Fatalf("expected version_no=1, got %d", row.VersionNo)
+	}
+	if row.ID != *currentVersionID {
+		t.Fatalf("expected current_version_id=%s, got %s", row.ID, *currentVersionID)
+	}
+
+	var snapshot map[string]any
+	if err := json.Unmarshal([]byte(row.Data), &snapshot); err != nil {
+		t.Fatalf("parse snapshot json: %v", err)
+	}
+	if snapshot["uuid"] != "cfg-1" {
+		t.Fatalf("expected snapshot uuid cfg-1, got %v", snapshot["uuid"])
+	}
+	if snapshot["name"] != "Cfg One" {
+		t.Fatalf("expected snapshot name Cfg One, got %v", snapshot["name"])
+	}
+}
+
+func execSQLScript(db *gorm.DB, script string) error {
+	var cleaned []string
+	for _, line := range strings.Split(script, "\n") {
+		trimmed := strings.TrimSpace(line)
+		if strings.HasPrefix(trimmed, "--") {
+			continue
+		}
+		cleaned = append(cleaned, line)
+	}
+
+	for _, stmt := range strings.Split(strings.Join(cleaned, "\n"), ";") {
+		sql := strings.TrimSpace(stmt)
+		if sql == "" {
+			continue
+		}
+		if err := db.Exec(sql).Error; err != nil {
+			return err
+		}
+	}
+	return nil
+}

internal/localdb/migrations.go

@@ -0,0 +1,438 @@
+package localdb
+
+import (
+	"errors"
+	"fmt"
+	"log/slog"
+	"strings"
+	"time"
+
+	"github.com/google/uuid"
+	"gorm.io/gorm"
+)
+
+type LocalSchemaMigration struct {
+	ID        string    `gorm:"primaryKey;size:128"`
+	Name      string    `gorm:"not null;size:255"`
+	AppliedAt time.Time `gorm:"not null"`
+}
+
+func (LocalSchemaMigration) TableName() string {
+	return "local_schema_migrations"
+}
+
+type localMigration struct {
+	id   string
+	name string
+	run  func(tx *gorm.DB) error
+}
+
+var localMigrations = []localMigration{
+	{
+		id:   "2026_02_04_versioning_backfill",
+		name: "Ensure configuration versioning data and current pointers",
+		run:  backfillConfigurationVersions,
+	},
+	{
+		id:   "2026_02_04_is_active_backfill",
+		name: "Ensure is_active defaults to true for existing configurations",
+		run:  backfillConfigurationIsActive,
+	},
+	{
+		id:   "2026_02_06_projects_backfill",
+		name: "Create default projects and attach existing configurations",
+		run:  backfillProjectsForConfigurations,
+	},
+	{
+		id:   "2026_02_06_pricelist_backfill",
+		name: "Attach existing configurations to latest local pricelist and recalc usage",
+		run:  backfillConfigurationPricelists,
+	},
+	{
+		id:   "2026_02_06_pricelist_index_fix",
+		name: "Use unique server_id for local pricelists and allow duplicate versions",
+		run:  fixLocalPricelistIndexes,
+	},
+	{
+		id:   "2026_02_06_pricelist_source",
+		name: "Backfill source for local pricelists and create source indexes",
+		run:  backfillLocalPricelistSource,
+	},
+	{
+		id:   "2026_02_09_drop_component_unused_fields",
+		name: "Remove current_price and synced_at from local_components (unused fields)",
+		run:  dropComponentUnusedFields,
+	},
+	{
+		id:   "2026_02_09_add_warehouse_competitor_pricelists",
+		name: "Add warehouse_pricelist_id and competitor_pricelist_id to local_configurations",
+		run:  addWarehouseCompetitorPriceLists,
+	},
+}
+
+func runLocalMigrations(db *gorm.DB) error {
+	if err := db.AutoMigrate(&LocalSchemaMigration{}); err != nil {
+		return fmt.Errorf("migrate local schema migrations table: %w", err)
+	}
+
+	for _, migration := range localMigrations {
+		var count int64
+		if err := db.Model(&LocalSchemaMigration{}).Where("id = ?", migration.id).Count(&count).Error; err != nil {
+			return fmt.Errorf("check local migration %s: %w", migration.id, err)
+		}
+		if count > 0 {
+			continue
+		}
+
+		if err := db.Transaction(func(tx *gorm.DB) error {
+			if err := migration.run(tx); err != nil {
+				return fmt.Errorf("run migration %s: %w", migration.id, err)
+			}
+
+			record := &LocalSchemaMigration{
+				ID:        migration.id,
+				Name:      migration.name,
+				AppliedAt: time.Now(),
+			}
+			if err := tx.Create(record).Error; err != nil {
+				return fmt.Errorf("insert migration %s record: %w", migration.id, err)
+			}
+			return nil
+		}); err != nil {
+			return err
+		}
+
+		slog.Info("local migration applied", "id", migration.id, "name", migration.name)
+	}
+
+	return nil
+}
+
+func backfillConfigurationVersions(tx *gorm.DB) error {
+	var configs []LocalConfiguration
+	if err := tx.Find(&configs).Error; err != nil {
+		return fmt.Errorf("load local configurations for backfill: %w", err)
+	}
+
+	for i := range configs {
+		cfg := configs[i]
+		var versionCount int64
+		if err := tx.Model(&LocalConfigurationVersion{}).
+			Where("configuration_uuid = ?", cfg.UUID).
+			Count(&versionCount).Error; err != nil {
+			return fmt.Errorf("count versions for %s: %w", cfg.UUID, err)
+		}
+
+		if versionCount == 0 {
+			snapshot, err := BuildConfigurationSnapshot(&cfg)
+			if err != nil {
+				return fmt.Errorf("build initial snapshot for %s: %w", cfg.UUID, err)
+			}
+			note := "Initial snapshot backfill (v1)"
+			version := LocalConfigurationVersion{
+				ID:                uuid.NewString(),
+				ConfigurationUUID: cfg.UUID,
+				VersionNo:         1,
+				Data:              snapshot,
+				ChangeNote:        &note,
+				AppVersion:        "backfill",
+				CreatedAt:         chooseNonZeroTime(cfg.CreatedAt, time.Now()),
+			}
+			if err := tx.Create(&version).Error; err != nil {
+				return fmt.Errorf("create v1 backfill for %s: %w", cfg.UUID, err)
+			}
+		}
+
+		if cfg.CurrentVersionID == nil || *cfg.CurrentVersionID == "" {
+			var latest LocalConfigurationVersion
+			if err := tx.Where("configuration_uuid = ?", cfg.UUID).
+				Order("version_no DESC").
+				First(&latest).Error; err != nil {
+				return fmt.Errorf("load latest version for %s: %w", cfg.UUID, err)
+			}
+			if err := tx.Model(&LocalConfiguration{}).
+				Where("uuid = ?", cfg.UUID).
+				Update("current_version_id", latest.ID).Error; err != nil {
+				return fmt.Errorf("set current version for %s: %w", cfg.UUID, err)
+			}
+		}
+	}
+
+	return nil
+}
+
+func backfillConfigurationIsActive(tx *gorm.DB) error {
+	return tx.Exec("UPDATE local_configurations SET is_active = 1 WHERE is_active IS NULL").Error
+}
+
+func backfillProjectsForConfigurations(tx *gorm.DB) error {
+	var owners []string
+	if err := tx.Model(&LocalConfiguration{}).
+		Distinct("original_username").
+		Pluck("original_username", &owners).Error; err != nil {
+		return fmt.Errorf("load owners for projects backfill: %w", err)
+	}
+
+	for _, owner := range owners {
+		project, err := ensureDefaultProjectTx(tx, owner)
+		if err != nil {
+			return err
+		}
+
+		if err := tx.Model(&LocalConfiguration{}).
+			Where("original_username = ? AND (project_uuid IS NULL OR project_uuid = '')", owner).
+			Update("project_uuid", project.UUID).Error; err != nil {
+			return fmt.Errorf("assign default project for owner %s: %w", owner, err)
+		}
+	}
+
+	return nil
+}
+
+func ensureDefaultProjectTx(tx *gorm.DB, ownerUsername string) (*LocalProject, error) {
+	var project LocalProject
+	err := tx.Where("owner_username = ? AND is_system = ? AND name = ?", ownerUsername, true, "Без проекта").
+		First(&project).Error
+	if err == nil {
+		return &project, nil
+	}
+	if err != nil && !errors.Is(err, gorm.ErrRecordNotFound) {
+		return nil, fmt.Errorf("load system project for %s: %w", ownerUsername, err)
+	}
+
+	now := time.Now()
+	project = LocalProject{
+		UUID:          uuid.NewString(),
+		OwnerUsername: ownerUsername,
+		Name:          "Без проекта",
+		IsActive:      true,
+		IsSystem:      true,
+		CreatedAt:     now,
+		UpdatedAt:     now,
+		SyncStatus:    "pending",
+	}
+	if err := tx.Create(&project).Error; err != nil {
+		return nil, fmt.Errorf("create system project for %s: %w", ownerUsername, err)
+	}
+
+	return &project, nil
+}
+
+func backfillConfigurationPricelists(tx *gorm.DB) error {
+	var latest LocalPricelist
+	if err := tx.Where("source = ?", "estimate").Order("created_at DESC").First(&latest).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil
+		}
+		return fmt.Errorf("load latest local pricelist: %w", err)
+	}
+
+	if err := tx.Model(&LocalConfiguration{}).
+		Where("pricelist_id IS NULL").
+		Update("pricelist_id", latest.ServerID).Error; err != nil {
+		return fmt.Errorf("backfill configuration pricelist_id: %w", err)
+	}
+
+	if err := tx.Model(&LocalPricelist{}).Where("1 = 1").Update("is_used", false).Error; err != nil {
+		return fmt.Errorf("reset local pricelist usage flags: %w", err)
+	}
+
+	if err := tx.Exec(`
+		UPDATE local_pricelists
+		SET is_used = 1
+		WHERE server_id IN (
+			SELECT DISTINCT pricelist_id
+			FROM local_configurations
+			WHERE pricelist_id IS NOT NULL AND is_active = 1
+		)
+	`).Error; err != nil {
+		return fmt.Errorf("recalculate local pricelist usage flags: %w", err)
+	}
+
+	return nil
+}
+
+func chooseNonZeroTime(candidate time.Time, fallback time.Time) time.Time {
+	if candidate.IsZero() {
+		return fallback
+	}
+	return candidate
+}
+
+func fixLocalPricelistIndexes(tx *gorm.DB) error {
+	type indexRow struct {
+		Name   string `gorm:"column:name"`
+		Unique int    `gorm:"column:unique"`
+	}
+	var indexes []indexRow
+	if err := tx.Raw("PRAGMA index_list('local_pricelists')").Scan(&indexes).Error; err != nil {
+		return fmt.Errorf("list local_pricelists indexes: %w", err)
+	}
+
+	for _, idx := range indexes {
+		if idx.Unique == 0 {
+			continue
+		}
+
+		type indexInfoRow struct {
+			Name string `gorm:"column:name"`
+		}
+		var info []indexInfoRow
+		if err := tx.Raw(fmt.Sprintf("PRAGMA index_info('%s')", strings.ReplaceAll(idx.Name, "'", "''"))).Scan(&info).Error; err != nil {
+			return fmt.Errorf("load index info for %s: %w", idx.Name, err)
+		}
+		if len(info) != 1 || info[0].Name != "version" {
+			continue
+		}
+
+		quoted := strings.ReplaceAll(idx.Name, `"`, `""`)
+		if err := tx.Exec(fmt.Sprintf(`DROP INDEX IF EXISTS "%s"`, quoted)).Error; err != nil {
+			return fmt.Errorf("drop unique version index %s: %w", idx.Name, err)
+		}
+	}
+
+	if err := tx.Exec(`
+		CREATE UNIQUE INDEX IF NOT EXISTS idx_local_pricelists_server_id
+		ON local_pricelists(server_id)
+	`).Error; err != nil {
+		return fmt.Errorf("ensure unique index local_pricelists(server_id): %w", err)
+	}
+
+	if err := tx.Exec(`
+		CREATE INDEX IF NOT EXISTS idx_local_pricelists_version
+		ON local_pricelists(version)
+	`).Error; err != nil {
+		return fmt.Errorf("ensure index local_pricelists(version): %w", err)
+	}
+
+	return nil
+}
+
+func backfillLocalPricelistSource(tx *gorm.DB) error {
+	if err := tx.Exec(`
+		UPDATE local_pricelists
+		SET source = 'estimate'
+		WHERE source IS NULL OR source = ''
+	`).Error; err != nil {
+		return fmt.Errorf("backfill local_pricelists.source: %w", err)
+	}
+
+	if err := tx.Exec(`
+		CREATE INDEX IF NOT EXISTS idx_local_pricelists_source_created_at
+		ON local_pricelists(source, created_at DESC)
+	`).Error; err != nil {
+		return fmt.Errorf("ensure idx_local_pricelists_source_created_at: %w", err)
+	}
+
+	return nil
+}
+
+func dropComponentUnusedFields(tx *gorm.DB) error {
+	// Check if columns exist
+	type columnInfo struct {
+		Name string `gorm:"column:name"`
+	}
+
+	var columns []columnInfo
+	if err := tx.Raw(`
+		SELECT name FROM pragma_table_info('local_components')
+		WHERE name IN ('current_price', 'synced_at')
+	`).Scan(&columns).Error; err != nil {
+		return fmt.Errorf("check columns existence: %w", err)
+	}
+
+	if len(columns) == 0 {
+		slog.Info("unused fields already removed from local_components")
+		return nil
+	}
+
+	// SQLite: recreate table without current_price and synced_at
+	if err := tx.Exec(`
+		CREATE TABLE local_components_new (
+			lot_name TEXT PRIMARY KEY,
+			lot_description TEXT,
+			category TEXT,
+			model TEXT
+		)
+	`).Error; err != nil {
+		return fmt.Errorf("create new local_components table: %w", err)
+	}
+
+	if err := tx.Exec(`
+		INSERT INTO local_components_new (lot_name, lot_description, category, model)
+		SELECT lot_name, lot_description, category, model
+		FROM local_components
+	`).Error; err != nil {
+		return fmt.Errorf("copy data to new table: %w", err)
+	}
+
+	if err := tx.Exec(`DROP TABLE local_components`).Error; err != nil {
+		return fmt.Errorf("drop old table: %w", err)
+	}
+
+	if err := tx.Exec(`ALTER TABLE local_components_new RENAME TO local_components`).Error; err != nil {
+		return fmt.Errorf("rename new table: %w", err)
+	}
+
+	slog.Info("dropped current_price and synced_at columns from local_components")
+	return nil
+}
+
+func addWarehouseCompetitorPriceLists(tx *gorm.DB) error {
+	// Check if columns exist
+	type columnInfo struct {
+		Name string `gorm:"column:name"`
+	}
+
+	var columns []columnInfo
+	if err := tx.Raw(`
+		SELECT name FROM pragma_table_info('local_configurations')
+		WHERE name IN ('warehouse_pricelist_id', 'competitor_pricelist_id')
+	`).Scan(&columns).Error; err != nil {
+		return fmt.Errorf("check columns existence: %w", err)
+	}
+
+	if len(columns) == 2 {
+		slog.Info("warehouse and competitor pricelist columns already exist")
+		return nil
+	}
+
+	// Add columns if they don't exist
+	if err := tx.Exec(`
+		ALTER TABLE local_configurations
+		ADD COLUMN warehouse_pricelist_id INTEGER
+	`).Error; err != nil {
+		// Column might already exist, ignore
+		if !strings.Contains(err.Error(), "duplicate column") {
+			return fmt.Errorf("add warehouse_pricelist_id column: %w", err)
+		}
+	}
+
+	if err := tx.Exec(`
+		ALTER TABLE local_configurations
+		ADD COLUMN competitor_pricelist_id INTEGER
+	`).Error; err != nil {
+		// Column might already exist, ignore
+		if !strings.Contains(err.Error(), "duplicate column") {
+			return fmt.Errorf("add competitor_pricelist_id column: %w", err)
+		}
+	}
+
+	// Create indexes
+	if err := tx.Exec(`
+		CREATE INDEX IF NOT EXISTS idx_local_configurations_warehouse_pricelist
+		ON local_configurations(warehouse_pricelist_id)
+	`).Error; err != nil {
+		return fmt.Errorf("create warehouse pricelist index: %w", err)
+	}
+
+	if err := tx.Exec(`
+		CREATE INDEX IF NOT EXISTS idx_local_configurations_competitor_pricelist
+		ON local_configurations(competitor_pricelist_id)
+	`).Error; err != nil {
+		return fmt.Errorf("create competitor pricelist index: %w", err)
+	}
+
+	slog.Info("added warehouse and competitor pricelist fields to local_configurations")
+	return nil
+}

internal/localdb/models.go

@@ -57,39 +57,110 @@ func (c LocalConfigItems) Total() float64 {
 	return total
 }
 
+// LocalStringList is a JSON-encoded list of strings stored as TEXT in SQLite.
+type LocalStringList []string
+
+func (s LocalStringList) Value() (driver.Value, error) {
+	return json.Marshal(s)
+}
+
+func (s *LocalStringList) Scan(value interface{}) error {
+	if value == nil {
+		*s = make(LocalStringList, 0)
+		return nil
+	}
+	var bytes []byte
+	switch v := value.(type) {
+	case []byte:
+		bytes = v
+	case string:
+		bytes = []byte(v)
+	default:
+		return errors.New("type assertion failed for LocalStringList")
+	}
+	return json.Unmarshal(bytes, s)
+}
+
 // LocalConfiguration stores configurations in local SQLite
 type LocalConfiguration struct {
-	ID             uint             `gorm:"primaryKey;autoIncrement" json:"id"`
-	UUID           string           `gorm:"uniqueIndex;not null" json:"uuid"`
-	ServerID       *uint            `json:"server_id"`        // ID on MariaDB server, NULL if local only
-	Name           string           `gorm:"not null" json:"name"`
-	Items          LocalConfigItems `gorm:"type:text" json:"items"` // JSON stored as text in SQLite
-	TotalPrice     *float64         `json:"total_price"`
-	CustomPrice    *float64         `json:"custom_price"`
-	Notes          string           `json:"notes"`
-	IsTemplate     bool             `gorm:"default:false" json:"is_template"`
-	ServerCount    int              `gorm:"default:1" json:"server_count"`
-	PriceUpdatedAt *time.Time       `gorm:"type:timestamp" json:"price_updated_at,omitempty"`
-	CreatedAt      time.Time        `json:"created_at"`
-	UpdatedAt      time.Time        `json:"updated_at"`
-	SyncedAt       *time.Time       `json:"synced_at"`
-	SyncStatus     string           `gorm:"default:'local'" json:"sync_status"` // 'local', 'synced', 'modified'
-	OriginalUserID uint             `json:"original_user_id"`                   // UserID from MariaDB for reference
+	ID               uint                        `gorm:"primaryKey;autoIncrement" json:"id"`
+	UUID             string                      `gorm:"uniqueIndex;not null" json:"uuid"`
+	ServerID         *uint                       `json:"server_id"` // ID on MariaDB server, NULL if local only
+	ProjectUUID      *string                     `gorm:"index" json:"project_uuid,omitempty"`
+	CurrentVersionID *string                     `gorm:"index" json:"current_version_id,omitempty"`
+	IsActive         bool                        `gorm:"default:true;index" json:"is_active"`
+	Name             string                      `gorm:"not null" json:"name"`
+	Items            LocalConfigItems            `gorm:"type:text" json:"items"` // JSON stored as text in SQLite
+	TotalPrice       *float64                    `json:"total_price"`
+	CustomPrice      *float64                    `json:"custom_price"`
+	Notes            string                      `json:"notes"`
+	IsTemplate       bool                        `gorm:"default:false" json:"is_template"`
+	ServerCount      int                         `gorm:"default:1" json:"server_count"`
+	PricelistID           *uint                       `gorm:"index" json:"pricelist_id,omitempty"`
+	WarehousePricelistID  *uint                       `gorm:"index" json:"warehouse_pricelist_id,omitempty"`
+	CompetitorPricelistID *uint                       `gorm:"index" json:"competitor_pricelist_id,omitempty"`
+	OnlyInStock           bool                        `gorm:"default:false" json:"only_in_stock"`
+	PriceUpdatedAt   *time.Time                  `gorm:"type:timestamp" json:"price_updated_at,omitempty"`
+	CreatedAt        time.Time                   `json:"created_at"`
+	UpdatedAt        time.Time                   `json:"updated_at"`
+	SyncedAt         *time.Time                  `json:"synced_at"`
+	SyncStatus       string                      `gorm:"default:'local'" json:"sync_status"` // 'local', 'synced', 'modified'
+	OriginalUserID   uint                        `json:"original_user_id"`                   // UserID from MariaDB for reference
+	OriginalUsername string                      `gorm:"not null;default:'';index" json:"original_username"`
+	CurrentVersion   *LocalConfigurationVersion  `gorm:"foreignKey:CurrentVersionID;references:ID" json:"current_version,omitempty"`
+	Versions         []LocalConfigurationVersion `gorm:"foreignKey:ConfigurationUUID;references:UUID" json:"versions,omitempty"`
 }
 
 func (LocalConfiguration) TableName() string {
 	return "local_configurations"
 }
 
+type LocalProject struct {
+	ID            uint       `gorm:"primaryKey;autoIncrement" json:"id"`
+	UUID          string     `gorm:"uniqueIndex;not null" json:"uuid"`
+	ServerID      *uint      `json:"server_id,omitempty"`
+	OwnerUsername string     `gorm:"not null;index" json:"owner_username"`
+	Name          string     `gorm:"not null" json:"name"`
+	TrackerURL    string     `json:"tracker_url"`
+	IsActive      bool       `gorm:"default:true;index" json:"is_active"`
+	IsSystem      bool       `gorm:"default:false;index" json:"is_system"`
+	CreatedAt     time.Time  `json:"created_at"`
+	UpdatedAt     time.Time  `json:"updated_at"`
+	SyncedAt      *time.Time `json:"synced_at,omitempty"`
+	SyncStatus    string     `gorm:"default:'local'" json:"sync_status"` // local/synced/pending
+}
+
+func (LocalProject) TableName() string {
+	return "local_projects"
+}
+
+// LocalConfigurationVersion stores immutable full snapshots for each configuration version
+type LocalConfigurationVersion struct {
+	ID                string              `gorm:"primaryKey" json:"id"`
+	ConfigurationUUID string              `gorm:"not null;index:idx_lcv_config_created,priority:1;index:idx_lcv_config_version,priority:1;uniqueIndex:idx_lcv_config_version_unique,priority:1" json:"configuration_uuid"`
+	VersionNo         int                 `gorm:"not null;index:idx_lcv_config_version,sort:desc,priority:2;uniqueIndex:idx_lcv_config_version_unique,priority:2" json:"version_no"`
+	Data              string              `gorm:"type:text;not null" json:"data"`
+	ChangeNote        *string             `json:"change_note,omitempty"`
+	CreatedBy         *string             `json:"created_by,omitempty"`
+	AppVersion        string              `gorm:"size:64" json:"app_version,omitempty"`
+	CreatedAt         time.Time           `gorm:"not null;autoCreateTime;index:idx_lcv_config_created,sort:desc,priority:2" json:"created_at"`
+	Configuration     *LocalConfiguration `gorm:"foreignKey:ConfigurationUUID;references:UUID" json:"configuration,omitempty"`
+}
+
+func (LocalConfigurationVersion) TableName() string {
+	return "local_configuration_versions"
+}
+
 // LocalPricelist stores cached pricelists from server
 type LocalPricelist struct {
-	ID        uint       `gorm:"primaryKey;autoIncrement" json:"id"`
-	ServerID  uint       `gorm:"not null" json:"server_id"` // ID on MariaDB server
-	Version   string     `gorm:"uniqueIndex;not null" json:"version"`
-	Name      string     `json:"name"`
-	CreatedAt time.Time  `json:"created_at"`
-	SyncedAt  time.Time  `json:"synced_at"`
-	IsUsed    bool       `gorm:"default:false" json:"is_used"` // Used by any local configuration
+	ID        uint      `gorm:"primaryKey;autoIncrement" json:"id"`
+	ServerID  uint      `gorm:"not null;uniqueIndex" json:"server_id"` // ID on MariaDB server
+	Source    string    `gorm:"not null;default:'estimate';index:idx_local_pricelists_source_created_at,priority:1" json:"source"`
+	Version   string    `gorm:"not null;index" json:"version"`
+	Name      string    `json:"name"`
+	CreatedAt time.Time `gorm:"index:idx_local_pricelists_source_created_at,priority:2,sort:desc" json:"created_at"`
+	SyncedAt  time.Time `json:"synced_at"`
+	IsUsed    bool      `gorm:"default:false" json:"is_used"` // Used by any local configuration
 }
 
 func (LocalPricelist) TableName() string {
@@ -98,36 +169,64 @@ func (LocalPricelist) TableName() string {
 
 // LocalPricelistItem stores pricelist items
 type LocalPricelistItem struct {
-	ID          uint    `gorm:"primaryKey;autoIncrement" json:"id"`
-	PricelistID uint    `gorm:"not null;index" json:"pricelist_id"`
-	LotName     string  `gorm:"not null" json:"lot_name"`
-	Price       float64 `gorm:"not null" json:"price"`
+	ID           uint            `gorm:"primaryKey;autoIncrement" json:"id"`
+	PricelistID  uint            `gorm:"not null;index" json:"pricelist_id"`
+	LotName      string          `gorm:"not null" json:"lot_name"`
+	Price        float64         `gorm:"not null" json:"price"`
+	AvailableQty *float64        `json:"available_qty,omitempty"`
+	Partnumbers  LocalStringList `gorm:"type:text" json:"partnumbers,omitempty"`
 }
 
 func (LocalPricelistItem) TableName() string {
 	return "local_pricelist_items"
 }
 
-// LocalComponent stores cached components for offline search
+// LocalComponent stores cached components for offline search (metadata only)
+// All pricing is now sourced from local_pricelist_items based on configuration pricelist selection
 type LocalComponent struct {
-	LotName        string    `gorm:"primaryKey" json:"lot_name"`
-	LotDescription string    `json:"lot_description"`
-	Category       string    `json:"category"`
-	Model          string    `json:"model"`
-	CurrentPrice   *float64  `json:"current_price"`
-	SyncedAt       time.Time `json:"synced_at"`
+	LotName        string `gorm:"primaryKey" json:"lot_name"`
+	LotDescription string `json:"lot_description"`
+	Category       string `json:"category"`
+	Model          string `json:"model"`
 }
 
 func (LocalComponent) TableName() string {
 	return "local_components"
 }
 
+// LocalRemoteMigrationApplied tracks remote SQLite migrations received from server and applied locally.
+type LocalRemoteMigrationApplied struct {
+	ID         string    `gorm:"primaryKey;size:128" json:"id"`
+	Checksum   string    `gorm:"size:128;not null" json:"checksum"`
+	AppVersion string    `gorm:"size:64" json:"app_version,omitempty"`
+	AppliedAt  time.Time `gorm:"not null" json:"applied_at"`
+}
+
+func (LocalRemoteMigrationApplied) TableName() string {
+	return "local_remote_migrations_applied"
+}
+
+// LocalSyncGuardState stores latest sync readiness decision for UI and preflight checks.
+type LocalSyncGuardState struct {
+	ID                    uint       `gorm:"primaryKey;autoIncrement" json:"id"`
+	Status                string     `gorm:"size:32;not null;index" json:"status"` // ready|blocked|unknown
+	ReasonCode            string     `gorm:"size:128" json:"reason_code,omitempty"`
+	ReasonText            string     `gorm:"type:text" json:"reason_text,omitempty"`
+	RequiredMinAppVersion *string    `gorm:"size:64" json:"required_min_app_version,omitempty"`
+	LastCheckedAt         *time.Time `json:"last_checked_at,omitempty"`
+	UpdatedAt             time.Time  `json:"updated_at"`
+}
+
+func (LocalSyncGuardState) TableName() string {
+	return "local_sync_guard_state"
+}
+
 // PendingChange stores changes that need to be synced to the server
 type PendingChange struct {
 	ID         int64     `gorm:"primaryKey;autoIncrement" json:"id"`
 	EntityType string    `gorm:"not null;index" json:"entity_type"` // "configuration", "project", "specification"
 	EntityUUID string    `gorm:"not null;index" json:"entity_uuid"`
-	Operation  string    `gorm:"not null" json:"operation"` // "create", "update", "delete"
+	Operation  string    `gorm:"not null" json:"operation"` // "create", "update", "rollback", "deactivate", "reactivate", "delete"
 	Payload    string    `gorm:"type:text" json:"payload"`  // JSON snapshot of the entity
 	CreatedAt  time.Time `gorm:"not null" json:"created_at"`
 	Attempts   int       `gorm:"default:0" json:"attempts"` // Retry count for sync

internal/localdb/snapshots.go

@@ -0,0 +1,87 @@
+package localdb
+
+import (
+	"encoding/json"
+	"fmt"
+	"time"
+)
+
+// BuildConfigurationSnapshot serializes the full local configuration state.
+func BuildConfigurationSnapshot(localCfg *LocalConfiguration) (string, error) {
+	snapshot := map[string]interface{}{
+		"id":                 localCfg.ID,
+		"uuid":               localCfg.UUID,
+		"server_id":          localCfg.ServerID,
+		"project_uuid":       localCfg.ProjectUUID,
+		"current_version_id": localCfg.CurrentVersionID,
+		"is_active":          localCfg.IsActive,
+		"name":               localCfg.Name,
+		"items":              localCfg.Items,
+		"total_price":        localCfg.TotalPrice,
+		"custom_price":       localCfg.CustomPrice,
+		"notes":              localCfg.Notes,
+		"is_template":        localCfg.IsTemplate,
+		"server_count":       localCfg.ServerCount,
+		"pricelist_id":       localCfg.PricelistID,
+		"only_in_stock":      localCfg.OnlyInStock,
+		"price_updated_at":   localCfg.PriceUpdatedAt,
+		"created_at":         localCfg.CreatedAt,
+		"updated_at":         localCfg.UpdatedAt,
+		"synced_at":          localCfg.SyncedAt,
+		"sync_status":        localCfg.SyncStatus,
+		"original_user_id":   localCfg.OriginalUserID,
+		"original_username":  localCfg.OriginalUsername,
+	}
+
+	data, err := json.Marshal(snapshot)
+	if err != nil {
+		return "", fmt.Errorf("marshal configuration snapshot: %w", err)
+	}
+	return string(data), nil
+}
+
+// DecodeConfigurationSnapshot returns editable fields from one saved snapshot.
+func DecodeConfigurationSnapshot(data string) (*LocalConfiguration, error) {
+	var snapshot struct {
+		ProjectUUID      *string          `json:"project_uuid"`
+		IsActive         *bool            `json:"is_active"`
+		Name             string           `json:"name"`
+		Items            LocalConfigItems `json:"items"`
+		TotalPrice       *float64         `json:"total_price"`
+		CustomPrice      *float64         `json:"custom_price"`
+		Notes            string           `json:"notes"`
+		IsTemplate       bool             `json:"is_template"`
+		ServerCount      int              `json:"server_count"`
+		PricelistID      *uint            `json:"pricelist_id"`
+		OnlyInStock      bool             `json:"only_in_stock"`
+		PriceUpdatedAt   *time.Time       `json:"price_updated_at"`
+		OriginalUserID   uint             `json:"original_user_id"`
+		OriginalUsername string           `json:"original_username"`
+	}
+
+	if err := json.Unmarshal([]byte(data), &snapshot); err != nil {
+		return nil, fmt.Errorf("unmarshal snapshot JSON: %w", err)
+	}
+
+	isActive := true
+	if snapshot.IsActive != nil {
+		isActive = *snapshot.IsActive
+	}
+
+	return &LocalConfiguration{
+		IsActive:         isActive,
+		ProjectUUID:      snapshot.ProjectUUID,
+		Name:             snapshot.Name,
+		Items:            snapshot.Items,
+		TotalPrice:       snapshot.TotalPrice,
+		CustomPrice:      snapshot.CustomPrice,
+		Notes:            snapshot.Notes,
+		IsTemplate:       snapshot.IsTemplate,
+		ServerCount:      snapshot.ServerCount,
+		PricelistID:      snapshot.PricelistID,
+		OnlyInStock:      snapshot.OnlyInStock,
+		PriceUpdatedAt:   snapshot.PriceUpdatedAt,
+		OriginalUserID:   snapshot.OriginalUserID,
+		OriginalUsername: snapshot.OriginalUsername,
+	}, nil
+}

internal/lotmatch/resolver.go

@@ -0,0 +1,238 @@
+package lotmatch
+
+import (
+	"errors"
+	"regexp"
+	"sort"
+	"strings"
+
+	"git.mchus.pro/mchus/quoteforge/internal/models"
+	"gorm.io/gorm"
+)
+
+var (
+	ErrResolveConflict = errors.New("multiple lot matches")
+	ErrResolveNotFound = errors.New("lot not found")
+)
+
+type LotResolver struct {
+	partnumberToLots map[string][]string
+	exactLots        map[string]string
+	allLots          []string
+}
+
+type MappingMatcher struct {
+	exact    map[string][]string
+	exactLot map[string]string
+	wildcard []wildcardMapping
+}
+
+type wildcardMapping struct {
+	lotName string
+	re      *regexp.Regexp
+}
+
+func NewLotResolverFromDB(db *gorm.DB) (*LotResolver, error) {
+	mappings, lots, err := loadMappingsAndLots(db)
+	if err != nil {
+		return nil, err
+	}
+	return NewLotResolver(mappings, lots), nil
+}
+
+func NewMappingMatcherFromDB(db *gorm.DB) (*MappingMatcher, error) {
+	mappings, lots, err := loadMappingsAndLots(db)
+	if err != nil {
+		return nil, err
+	}
+	return NewMappingMatcher(mappings, lots), nil
+}
+
+func NewLotResolver(mappings []models.LotPartnumber, lots []models.Lot) *LotResolver {
+	partnumberToLots := make(map[string][]string, len(mappings))
+	for _, m := range mappings {
+		pn := NormalizeKey(m.Partnumber)
+		lot := strings.TrimSpace(m.LotName)
+		if pn == "" || lot == "" {
+			continue
+		}
+		partnumberToLots[pn] = append(partnumberToLots[pn], lot)
+	}
+	for key := range partnumberToLots {
+		partnumberToLots[key] = uniqueCaseInsensitive(partnumberToLots[key])
+	}
+
+	exactLots := make(map[string]string, len(lots))
+	allLots := make([]string, 0, len(lots))
+	for _, l := range lots {
+		name := strings.TrimSpace(l.LotName)
+		if name == "" {
+			continue
+		}
+		exactLots[NormalizeKey(name)] = name
+		allLots = append(allLots, name)
+	}
+	sort.Slice(allLots, func(i, j int) bool {
+		li := len([]rune(allLots[i]))
+		lj := len([]rune(allLots[j]))
+		if li == lj {
+			return allLots[i] < allLots[j]
+		}
+		return li > lj
+	})
+
+	return &LotResolver{
+		partnumberToLots: partnumberToLots,
+		exactLots:        exactLots,
+		allLots:          allLots,
+	}
+}
+
+func NewMappingMatcher(mappings []models.LotPartnumber, lots []models.Lot) *MappingMatcher {
+	exact := make(map[string][]string, len(mappings))
+	wildcards := make([]wildcardMapping, 0, len(mappings))
+	for _, m := range mappings {
+		pn := NormalizeKey(m.Partnumber)
+		lot := strings.TrimSpace(m.LotName)
+		if pn == "" || lot == "" {
+			continue
+		}
+		if strings.Contains(pn, "*") {
+			pattern := "^" + regexp.QuoteMeta(pn) + "$"
+			pattern = strings.ReplaceAll(pattern, "\\*", ".*")
+			re, err := regexp.Compile(pattern)
+			if err != nil {
+				continue
+			}
+			wildcards = append(wildcards, wildcardMapping{lotName: lot, re: re})
+			continue
+		}
+		exact[pn] = append(exact[pn], lot)
+	}
+	for key := range exact {
+		exact[key] = uniqueCaseInsensitive(exact[key])
+	}
+
+	exactLot := make(map[string]string, len(lots))
+	for _, l := range lots {
+		name := strings.TrimSpace(l.LotName)
+		if name == "" {
+			continue
+		}
+		exactLot[NormalizeKey(name)] = name
+	}
+
+	return &MappingMatcher{
+		exact:    exact,
+		exactLot: exactLot,
+		wildcard: wildcards,
+	}
+}
+
+func (r *LotResolver) Resolve(partnumber string) (string, string, error) {
+	key := NormalizeKey(partnumber)
+	if key == "" {
+		return "", "", ErrResolveNotFound
+	}
+
+	if mapped := r.partnumberToLots[key]; len(mapped) > 0 {
+		if len(mapped) == 1 {
+			return mapped[0], "mapping_table", nil
+		}
+		return "", "", ErrResolveConflict
+	}
+	if exact, ok := r.exactLots[key]; ok {
+		return exact, "article_exact", nil
+	}
+
+	best := ""
+	bestLen := -1
+	tie := false
+	for _, lot := range r.allLots {
+		lotKey := NormalizeKey(lot)
+		if lotKey == "" {
+			continue
+		}
+		if strings.HasPrefix(key, lotKey) {
+			l := len([]rune(lotKey))
+			if l > bestLen {
+				best = lot
+				bestLen = l
+				tie = false
+			} else if l == bestLen && !strings.EqualFold(best, lot) {
+				tie = true
+			}
+		}
+	}
+	if best == "" {
+		return "", "", ErrResolveNotFound
+	}
+	if tie {
+		return "", "", ErrResolveConflict
+	}
+	return best, "prefix", nil
+}
+
+func (m *MappingMatcher) MatchLots(partnumber string) []string {
+	if m == nil {
+		return nil
+	}
+	key := NormalizeKey(partnumber)
+	if key == "" {
+		return nil
+	}
+
+	lots := make([]string, 0, 2)
+	if exact := m.exact[key]; len(exact) > 0 {
+		lots = append(lots, exact...)
+	}
+	for _, wc := range m.wildcard {
+		if wc.re == nil || !wc.re.MatchString(key) {
+			continue
+		}
+		lots = append(lots, wc.lotName)
+	}
+	if lot, ok := m.exactLot[key]; ok && strings.TrimSpace(lot) != "" {
+		lots = append(lots, lot)
+	}
+	return uniqueCaseInsensitive(lots)
+}
+
+func NormalizeKey(v string) string {
+	s := strings.ToLower(strings.TrimSpace(v))
+	replacer := strings.NewReplacer(" ", "", "-", "", "_", "", ".", "", "/", "", "\\", "", "\"", "", "'", "", "(", "", ")", "")
+	return replacer.Replace(s)
+}
+
+func loadMappingsAndLots(db *gorm.DB) ([]models.LotPartnumber, []models.Lot, error) {
+	var mappings []models.LotPartnumber
+	if err := db.Find(&mappings).Error; err != nil {
+		return nil, nil, err
+	}
+	var lots []models.Lot
+	if err := db.Select("lot_name").Find(&lots).Error; err != nil {
+		return nil, nil, err
+	}
+	return mappings, lots, nil
+}
+
+func uniqueCaseInsensitive(values []string) []string {
+	seen := make(map[string]struct{}, len(values))
+	out := make([]string, 0, len(values))
+	for _, v := range values {
+		trimmed := strings.TrimSpace(v)
+		if trimmed == "" {
+			continue
+		}
+		key := strings.ToLower(trimmed)
+		if _, ok := seen[key]; ok {
+			continue
+		}
+		seen[key] = struct{}{}
+		out = append(out, trimmed)
+	}
+	sort.Slice(out, func(i, j int) bool {
+		return strings.ToLower(out[i]) < strings.ToLower(out[j])
+	})
+	return out
+}

internal/lotmatch/resolver_test.go

@@ -0,0 +1,62 @@
+package lotmatch
+
+import (
+	"testing"
+
+	"git.mchus.pro/mchus/quoteforge/internal/models"
+)
+
+func TestLotResolverPrecedence(t *testing.T) {
+	resolver := NewLotResolver(
+		[]models.LotPartnumber{
+			{Partnumber: "PN-1", LotName: "LOT_A"},
+		},
+		[]models.Lot{
+			{LotName: "CPU_X_LONG"},
+			{LotName: "CPU_X"},
+		},
+	)
+
+	lot, by, err := resolver.Resolve("PN-1")
+	if err != nil || lot != "LOT_A" || by != "mapping_table" {
+		t.Fatalf("expected mapping_table LOT_A, got lot=%s by=%s err=%v", lot, by, err)
+	}
+
+	lot, by, err = resolver.Resolve("CPU_X")
+	if err != nil || lot != "CPU_X" || by != "article_exact" {
+		t.Fatalf("expected article_exact CPU_X, got lot=%s by=%s err=%v", lot, by, err)
+	}
+
+	lot, by, err = resolver.Resolve("CPU_X_LONG_001")
+	if err != nil || lot != "CPU_X_LONG" || by != "prefix" {
+		t.Fatalf("expected prefix CPU_X_LONG, got lot=%s by=%s err=%v", lot, by, err)
+	}
+}
+
+func TestMappingMatcherWildcardAndExactLot(t *testing.T) {
+	matcher := NewMappingMatcher(
+		[]models.LotPartnumber{
+			{Partnumber: "R750*", LotName: "SERVER_R750"},
+			{Partnumber: "HDD-01", LotName: "HDD_01"},
+		},
+		[]models.Lot{
+			{LotName: "MEM_DDR5_16G_4800"},
+		},
+	)
+
+	check := func(partnumber string, want string) {
+		t.Helper()
+		got := matcher.MatchLots(partnumber)
+		if len(got) != 1 || got[0] != want {
+			t.Fatalf("partnumber %s: expected [%s], got %#v", partnumber, want, got)
+		}
+	}
+
+	check("R750XD", "SERVER_R750")
+	check("HDD-01", "HDD_01")
+	check("MEM_DDR5_16G_4800", "MEM_DDR5_16G_4800")
+
+	if got := matcher.MatchLots("UNKNOWN"); len(got) != 0 {
+		t.Fatalf("expected no matches for UNKNOWN, got %#v", got)
+	}
+}

internal/middleware/auth.go

@@ -4,9 +4,9 @@ import (
 	"net/http"
 	"strings"
 
-	"github.com/gin-gonic/gin"
 	"git.mchus.pro/mchus/quoteforge/internal/models"
 	"git.mchus.pro/mchus/quoteforge/internal/services"
+	"github.com/gin-gonic/gin"
 )
 
 const (
@@ -99,3 +99,12 @@ func GetUserID(c *gin.Context) uint {
 	}
 	return claims.UserID
 }
+
+// GetUsername extracts username from context
+func GetUsername(c *gin.Context) string {
+	claims := GetClaims(c)
+	if claims == nil {
+		return ""
+	}
+	return claims.Username
+}

internal/middleware/cors.go

@@ -1,22 +1,55 @@
 package middleware
 
 import (
+	"net"
+	"net/http"
+	"net/url"
+	"strings"
+
 	"github.com/gin-gonic/gin"
 )
 
 func CORS() gin.HandlerFunc {
 	return func(c *gin.Context) {
-		c.Header("Access-Control-Allow-Origin", "*")
-		c.Header("Access-Control-Allow-Methods", "GET, POST, PUT, PATCH, DELETE, OPTIONS")
-		c.Header("Access-Control-Allow-Headers", "Origin, Content-Type, Accept, Authorization")
-		c.Header("Access-Control-Expose-Headers", "Content-Length, Content-Disposition")
-		c.Header("Access-Control-Max-Age", "86400")
+		origin := strings.TrimSpace(c.GetHeader("Origin"))
+		if origin != "" {
+			if isLoopbackOrigin(origin) {
+				c.Header("Access-Control-Allow-Origin", origin)
+				c.Header("Vary", "Origin")
+				c.Header("Access-Control-Allow-Methods", "GET, POST, PUT, PATCH, DELETE, OPTIONS")
+				c.Header("Access-Control-Allow-Headers", "Origin, Content-Type, Accept, Authorization")
+				c.Header("Access-Control-Expose-Headers", "Content-Length, Content-Disposition")
+				c.Header("Access-Control-Max-Age", "86400")
+			} else if c.Request.Method == http.MethodOptions {
+				c.AbortWithStatus(http.StatusForbidden)
+				return
+			}
+		}
 
-		if c.Request.Method == "OPTIONS" {
-			c.AbortWithStatus(204)
+		if c.Request.Method == http.MethodOptions {
+			c.AbortWithStatus(http.StatusNoContent)
 			return
 		}
 
 		c.Next()
 	}
 }
+
+func isLoopbackOrigin(origin string) bool {
+	u, err := url.Parse(origin)
+	if err != nil {
+		return false
+	}
+	if u.Scheme != "http" && u.Scheme != "https" {
+		return false
+	}
+	host := strings.TrimSpace(u.Hostname())
+	if host == "" {
+		return false
+	}
+	if strings.EqualFold(host, "localhost") {
+		return true
+	}
+	ip := net.ParseIP(host)
+	return ip != nil && ip.IsLoopback()
+}

internal/models/configuration.go

@@ -40,18 +40,26 @@ func (c ConfigItems) Total() float64 {
 }
 
 type Configuration struct {
-	ID               uint       `gorm:"primaryKey;autoIncrement" json:"id"`
-	UUID             string     `gorm:"size:36;uniqueIndex;not null" json:"uuid"`
-	UserID           uint       `gorm:"not null" json:"user_id"`
-	Name             string     `gorm:"size:200;not null" json:"name"`
-	Items            ConfigItems `gorm:"type:json;not null" json:"items"`
-	TotalPrice       *float64   `gorm:"type:decimal(12,2)" json:"total_price"`
-	CustomPrice      *float64   `gorm:"type:decimal(12,2)" json:"custom_price"`
-	Notes            string     `gorm:"type:text" json:"notes"`
-	IsTemplate       bool       `gorm:"default:false" json:"is_template"`
-	ServerCount      int        `gorm:"default:1" json:"server_count"`
-	PriceUpdatedAt   *time.Time `gorm:"type:timestamp" json:"price_updated_at,omitempty"`
-	CreatedAt        time.Time  `gorm:"autoCreateTime" json:"created_at"`
+	ID                    uint        `gorm:"primaryKey;autoIncrement" json:"id"`
+	UUID                  string      `gorm:"size:36;uniqueIndex;not null" json:"uuid"`
+	UserID                *uint       `json:"user_id,omitempty"` // Legacy field, no longer required for ownership
+	OwnerUsername         string      `gorm:"size:100;not null;default:'';index" json:"owner_username"`
+	ProjectUUID           *string     `gorm:"size:36;index" json:"project_uuid,omitempty"`
+	AppVersion            string      `gorm:"size:64" json:"app_version,omitempty"`
+	Name                  string      `gorm:"size:200;not null" json:"name"`
+	Items                 ConfigItems `gorm:"type:json;not null" json:"items"`
+	TotalPrice            *float64    `gorm:"type:decimal(12,2)" json:"total_price"`
+	CustomPrice           *float64    `gorm:"type:decimal(12,2)" json:"custom_price"`
+	Notes                 string      `gorm:"type:text" json:"notes"`
+	IsTemplate            bool        `gorm:"default:false" json:"is_template"`
+	ServerCount           int         `gorm:"default:1" json:"server_count"`
+	PricelistID           *uint       `gorm:"index" json:"pricelist_id,omitempty"`
+	WarehousePricelistID  *uint       `gorm:"index" json:"warehouse_pricelist_id,omitempty"`
+	CompetitorPricelistID *uint       `gorm:"index" json:"competitor_pricelist_id,omitempty"`
+	DisablePriceRefresh   bool        `gorm:"default:false" json:"disable_price_refresh"`
+	OnlyInStock           bool        `gorm:"default:false" json:"only_in_stock"`
+	PriceUpdatedAt        *time.Time  `gorm:"type:timestamp" json:"price_updated_at,omitempty"`
+	CreatedAt             time.Time   `gorm:"autoCreateTime" json:"created_at"`
 
 	User *User `gorm:"foreignKey:UserID" json:"user,omitempty"`
 }

internal/models/lot.go

@@ -37,3 +37,44 @@ type Supplier struct {
 func (Supplier) TableName() string {
 	return "supplier"
 }
+
+// StockLog stores warehouse stock snapshots imported from external files.
+type StockLog struct {
+	StockLogID uint      `gorm:"column:stock_log_id;primaryKey;autoIncrement"`
+	Partnumber string    `gorm:"column:partnumber;size:255;not null"`
+	Supplier   *string   `gorm:"column:supplier;size:255"`
+	Date       time.Time `gorm:"column:date;type:date;not null"`
+	Price      float64   `gorm:"column:price;not null"`
+	Quality    *string   `gorm:"column:quality;size:255"`
+	Comments   *string   `gorm:"column:comments;size:15000"`
+	Vendor     *string   `gorm:"column:vendor;size:255"`
+	Qty        *float64  `gorm:"column:qty"`
+}
+
+func (StockLog) TableName() string {
+	return "stock_log"
+}
+
+// LotPartnumber maps external part numbers to internal lots.
+type LotPartnumber struct {
+	Partnumber  string  `gorm:"column:partnumber;size:255;primaryKey" json:"partnumber"`
+	LotName     string  `gorm:"column:lot_name;size:255;primaryKey" json:"lot_name"`
+	Description *string `gorm:"column:description;size:10000" json:"description,omitempty"`
+}
+
+func (LotPartnumber) TableName() string {
+	return "lot_partnumbers"
+}
+
+// StockIgnoreRule contains import ignore pattern rules.
+type StockIgnoreRule struct {
+	ID        uint      `gorm:"column:id;primaryKey;autoIncrement" json:"id"`
+	Target    string    `gorm:"column:target;size:20;not null" json:"target"`         // partnumber|description
+	MatchType string    `gorm:"column:match_type;size:20;not null" json:"match_type"` // exact|prefix|suffix
+	Pattern   string    `gorm:"column:pattern;size:500;not null" json:"pattern"`
+	CreatedAt time.Time `gorm:"column:created_at;autoCreateTime" json:"created_at"`
+}
+
+func (StockIgnoreRule) TableName() string {
+	return "stock_ignore_rules"
+}

internal/models/models.go

@@ -13,6 +13,7 @@ func AllModels() []interface{} {
 		&User{},
 		&Category{},
 		&LotMetadata{},
+		&Project{},
 		&Configuration{},
 		&PriceOverride{},
 		&PricingAlert{},

internal/models/pricelist.go

@@ -4,12 +4,41 @@ import (
 	"time"
 )
 
+type PricelistSource string
+
+const (
+	PricelistSourceEstimate   PricelistSource = "estimate"
+	PricelistSourceWarehouse  PricelistSource = "warehouse"
+	PricelistSourceCompetitor PricelistSource = "competitor"
+)
+
+func (s PricelistSource) IsValid() bool {
+	switch s {
+	case PricelistSourceEstimate, PricelistSourceWarehouse, PricelistSourceCompetitor:
+		return true
+	default:
+		return false
+	}
+}
+
+func NormalizePricelistSource(source string) PricelistSource {
+	switch PricelistSource(source) {
+	case PricelistSourceWarehouse:
+		return PricelistSourceWarehouse
+	case PricelistSourceCompetitor:
+		return PricelistSourceCompetitor
+	default:
+		return PricelistSourceEstimate
+	}
+}
+
 // Pricelist represents a versioned snapshot of prices
 type Pricelist struct {
 	ID           uint       `gorm:"primaryKey" json:"id"`
-	Version      string     `gorm:"size:20;uniqueIndex;not null" json:"version"` // Format: YYYY-MM-DD-NNN
-	Notification string     `gorm:"size:500" json:"notification"`                // Notification shown in configurator
-	CreatedAt    time.Time  `json:"created_at"`
+	Source       string     `gorm:"size:20;not null;default:'estimate';uniqueIndex:idx_qt_pricelists_source_version,priority:1;index:idx_qt_pricelists_source_created_at,priority:1" json:"source"`
+	Version      string     `gorm:"size:20;not null;uniqueIndex:idx_qt_pricelists_source_version,priority:2" json:"version"` // Format: YYYY-MM-DD-NNN
+	Notification string     `gorm:"size:500" json:"notification"`                                                            // Notification shown in configurator
+	CreatedAt    time.Time  `gorm:"index:idx_qt_pricelists_source_created_at,priority:2,sort:desc" json:"created_at"`
 	CreatedBy    string     `gorm:"size:100" json:"created_by"`
 	IsActive     bool       `gorm:"default:true" json:"is_active"`
 	UsageCount   int        `gorm:"default:0" json:"usage_count"`
@@ -36,8 +65,10 @@ type PricelistItem struct {
 	MetaPrices       string   `gorm:"size:1000" json:"meta_prices,omitempty"`
 
 	// Virtual fields for display
-	LotDescription string `gorm:"-" json:"lot_description,omitempty"`
-	Category       string `gorm:"-" json:"category,omitempty"`
+	LotDescription string   `gorm:"-" json:"lot_description,omitempty"`
+	Category       string   `gorm:"-" json:"category,omitempty"`
+	AvailableQty   *float64 `gorm:"-" json:"available_qty,omitempty"`
+	Partnumbers    []string `gorm:"-" json:"partnumbers,omitempty"`
 }
 
 func (PricelistItem) TableName() string {
@@ -47,6 +78,7 @@ func (PricelistItem) TableName() string {
 // PricelistSummary is used for list views
 type PricelistSummary struct {
 	ID           uint       `json:"id"`
+	Source       string     `json:"source"`
 	Version      string     `json:"version"`
 	Notification string     `json:"notification"`
 	CreatedAt    time.Time  `json:"created_at"`

internal/models/project.go

@@ -0,0 +1,19 @@
+package models
+
+import "time"
+
+type Project struct {
+	ID            uint      `gorm:"primaryKey;autoIncrement" json:"id"`
+	UUID          string    `gorm:"size:36;uniqueIndex;not null" json:"uuid"`
+	OwnerUsername string    `gorm:"size:100;not null;index" json:"owner_username"`
+	Name          string    `gorm:"size:200;not null" json:"name"`
+	TrackerURL    string    `gorm:"size:500" json:"tracker_url"`
+	IsActive      bool      `gorm:"default:true;index" json:"is_active"`
+	IsSystem      bool      `gorm:"default:false;index" json:"is_system"`
+	CreatedAt     time.Time `gorm:"autoCreateTime" json:"created_at"`
+	UpdatedAt     time.Time `gorm:"autoUpdateTime" json:"updated_at"`
+}
+
+func (Project) TableName() string {
+	return "qt_projects"
+}

internal/models/sql_migrations.go

@@ -0,0 +1,227 @@
+package models
+
+import (
+	"bufio"
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+	"sort"
+	"strings"
+	"time"
+
+	mysqlDriver "github.com/go-sql-driver/mysql"
+	"gorm.io/gorm"
+)
+
+type SQLSchemaMigration struct {
+	ID        uint      `gorm:"primaryKey;autoIncrement"`
+	Filename  string    `gorm:"size:255;uniqueIndex;not null"`
+	AppliedAt time.Time `gorm:"autoCreateTime"`
+}
+
+func (SQLSchemaMigration) TableName() string {
+	return "qt_schema_migrations"
+}
+
+// NeedsSQLMigrations reports whether at least one SQL migration from migrationsDir
+// is not yet recorded in qt_schema_migrations.
+func NeedsSQLMigrations(db *gorm.DB, migrationsDir string) (bool, error) {
+	files, err := listSQLMigrationFiles(migrationsDir)
+	if err != nil {
+		return false, err
+	}
+	if len(files) == 0 {
+		return false, nil
+	}
+
+	// If tracking table does not exist yet, migrations are required.
+	if !db.Migrator().HasTable(&SQLSchemaMigration{}) {
+		return true, nil
+	}
+
+	var count int64
+	if err := db.Model(&SQLSchemaMigration{}).Where("filename IN ?", files).Count(&count).Error; err != nil {
+		return false, fmt.Errorf("check applied migrations: %w", err)
+	}
+
+	return count < int64(len(files)), nil
+}
+
+// RunSQLMigrations applies SQL files from migrationsDir once and records them in qt_schema_migrations.
+// Local SQLite-only scripts are skipped automatically.
+func RunSQLMigrations(db *gorm.DB, migrationsDir string) error {
+	if err := ensureSQLMigrationsTable(db); err != nil {
+		return fmt.Errorf("migrate qt_schema_migrations table: %w", err)
+	}
+
+	files, err := listSQLMigrationFiles(migrationsDir)
+	if err != nil {
+		return err
+	}
+
+	for _, filename := range files {
+		var count int64
+		if err := db.Model(&SQLSchemaMigration{}).Where("filename = ?", filename).Count(&count).Error; err != nil {
+			return fmt.Errorf("check migration %s: %w", filename, err)
+		}
+		if count > 0 {
+			continue
+		}
+
+		path := filepath.Join(migrationsDir, filename)
+		content, err := os.ReadFile(path)
+		if err != nil {
+			return fmt.Errorf("read migration %s: %w", filename, err)
+		}
+
+		statements := splitSQLStatements(string(content))
+		if len(statements) == 0 {
+			if err := db.Create(&SQLSchemaMigration{Filename: filename}).Error; err != nil {
+				return fmt.Errorf("record empty migration %s: %w", filename, err)
+			}
+			continue
+		}
+
+		if err := executeMigrationStatements(db, filename, statements); err != nil {
+			return err
+		}
+		if err := db.Create(&SQLSchemaMigration{Filename: filename}).Error; err != nil {
+			return fmt.Errorf("record migration %s: %w", filename, err)
+		}
+	}
+
+	return nil
+}
+
+// IsMigrationPermissionError returns true if err indicates insufficient privileges
+// to create/alter/read migration metadata or target schema objects.
+func IsMigrationPermissionError(err error) bool {
+	if err == nil {
+		return false
+	}
+
+	var mysqlErr *mysqlDriver.MySQLError
+	if errors.As(err, &mysqlErr) {
+		switch mysqlErr.Number {
+		case 1044, 1045, 1142, 1143, 1227:
+			return true
+		}
+	}
+
+	lower := strings.ToLower(err.Error())
+	patterns := []string{
+		"command denied to user",
+		"access denied for user",
+		"permission denied",
+		"insufficient privilege",
+		"sqlstate 42000",
+	}
+	for _, pattern := range patterns {
+		if strings.Contains(lower, pattern) {
+			return true
+		}
+	}
+	return false
+}
+
+func ensureSQLMigrationsTable(db *gorm.DB) error {
+	stmt := `
+CREATE TABLE IF NOT EXISTS qt_schema_migrations (
+	id BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
+	filename VARCHAR(255) NOT NULL UNIQUE,
+	applied_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
+);`
+	return db.Exec(stmt).Error
+}
+
+func executeMigrationStatements(db *gorm.DB, filename string, statements []string) error {
+	for _, stmt := range statements {
+		if err := db.Exec(stmt).Error; err != nil {
+			if isIgnorableMigrationError(err.Error()) {
+				continue
+			}
+			return fmt.Errorf("exec migration %s statement %q: %w", filename, stmt, err)
+		}
+	}
+	return nil
+}
+
+func isSQLiteOnlyMigration(filename string) bool {
+	lower := strings.ToLower(filename)
+	return strings.Contains(lower, "local_")
+}
+
+func isIgnorableMigrationError(message string) bool {
+	lower := strings.ToLower(message)
+	ignorable := []string{
+		"duplicate column name",
+		"duplicate key name",
+		"already exists",
+		"can't create table",
+		"duplicate foreign key constraint name",
+		"errno 121",
+	}
+	for _, pattern := range ignorable {
+		if strings.Contains(lower, pattern) {
+			return true
+		}
+	}
+	return false
+}
+
+func splitSQLStatements(script string) []string {
+	scanner := bufio.NewScanner(strings.NewReader(script))
+	scanner.Buffer(make([]byte, 1024), 1024*1024)
+
+	lines := make([]string, 0, 128)
+	for scanner.Scan() {
+		line := strings.TrimSpace(scanner.Text())
+		if line == "" {
+			continue
+		}
+		if strings.HasPrefix(line, "--") {
+			continue
+		}
+		lines = append(lines, scanner.Text())
+	}
+
+	combined := strings.Join(lines, "\n")
+	raw := strings.Split(combined, ";")
+	stmts := make([]string, 0, len(raw))
+	for _, stmt := range raw {
+		trimmed := strings.TrimSpace(stmt)
+		if trimmed == "" {
+			continue
+		}
+		stmts = append(stmts, trimmed)
+	}
+	return stmts
+}
+
+func listSQLMigrationFiles(migrationsDir string) ([]string, error) {
+	entries, err := os.ReadDir(migrationsDir)
+	if err != nil {
+		if errors.Is(err, os.ErrNotExist) {
+			return nil, nil
+		}
+		return nil, fmt.Errorf("read migrations dir %s: %w", migrationsDir, err)
+	}
+
+	files := make([]string, 0, len(entries))
+	for _, entry := range entries {
+		if entry.IsDir() {
+			continue
+		}
+		name := entry.Name()
+		if !strings.HasSuffix(strings.ToLower(name), ".sql") {
+			continue
+		}
+		if isSQLiteOnlyMigration(name) {
+			continue
+		}
+		files = append(files, name)
+	}
+	sort.Strings(files)
+	return files, nil
+}

internal/repository/component.go

@@ -110,6 +110,10 @@ func (r *ComponentRepository) Update(component *models.LotMetadata) error {
 	return r.db.Save(component).Error
 }
 
+func (r *ComponentRepository) DB() *gorm.DB {
+	return r.db
+}
+
 func (r *ComponentRepository) Create(component *models.LotMetadata) error {
 	return r.db.Create(component).Error
 }

internal/repository/configuration.go

@@ -19,7 +19,7 @@ func (r *ConfigurationRepository) Create(config *models.Configuration) error {
 
 func (r *ConfigurationRepository) GetByID(id uint) (*models.Configuration, error) {
 	var config models.Configuration
-	err := r.db.Preload("User").First(&config, id).Error
+	err := r.db.First(&config, id).Error
 	if err != nil {
 		return nil, err
 	}
@@ -28,7 +28,7 @@ func (r *ConfigurationRepository) GetByID(id uint) (*models.Configuration, error
 
 func (r *ConfigurationRepository) GetByUUID(uuid string) (*models.Configuration, error) {
 	var config models.Configuration
-	err := r.db.Preload("User").Where("uuid = ?", uuid).First(&config).Error
+	err := r.db.Where("uuid = ?", uuid).First(&config).Error
 	if err != nil {
 		return nil, err
 	}
@@ -43,13 +43,15 @@ func (r *ConfigurationRepository) Delete(id uint) error {
 	return r.db.Delete(&models.Configuration{}, id).Error
 }
 
-func (r *ConfigurationRepository) ListByUser(userID uint, offset, limit int) ([]models.Configuration, int64, error) {
+func (r *ConfigurationRepository) ListByUser(ownerUsername string, offset, limit int) ([]models.Configuration, int64, error) {
 	var configs []models.Configuration
 	var total int64
 
-	r.db.Model(&models.Configuration{}).Where("user_id = ?", userID).Count(&total)
+	ownerScope := "owner_username = ?"
+
+	r.db.Model(&models.Configuration{}).Where(ownerScope, ownerUsername).Count(&total)
 	err := r.db.
-		Where("user_id = ?", userID).
+		Where(ownerScope, ownerUsername).
 		Order("created_at DESC").
 		Offset(offset).
 		Limit(limit).
@@ -64,7 +66,6 @@ func (r *ConfigurationRepository) ListTemplates(offset, limit int) ([]models.Con
 
 	r.db.Model(&models.Configuration{}).Where("is_template = ?", true).Count(&total)
 	err := r.db.
-		Preload("User").
 		Where("is_template = ?", true).
 		Order("created_at DESC").
 		Offset(offset).

internal/repository/pricelist.go

@@ -1,10 +1,14 @@
 package repository
 
 import (
+	"errors"
 	"fmt"
+	"sort"
+	"strconv"
 	"strings"
 	"time"
 
+	"git.mchus.pro/mchus/quoteforge/internal/lotmatch"
 	"git.mchus.pro/mchus/quoteforge/internal/models"
 	"gorm.io/gorm"
 )
@@ -19,36 +23,89 @@ func NewPricelistRepository(db *gorm.DB) *PricelistRepository {
 
 // List returns pricelists with pagination
 func (r *PricelistRepository) List(offset, limit int) ([]models.PricelistSummary, int64, error) {
+	return r.ListBySource("", offset, limit)
+}
+
+// ListBySource returns pricelists filtered by source when provided.
+func (r *PricelistRepository) ListBySource(source string, offset, limit int) ([]models.PricelistSummary, int64, error) {
+	query := r.db.Model(&models.Pricelist{}).
+		Where("EXISTS (SELECT 1 FROM qt_pricelist_items WHERE qt_pricelist_items.pricelist_id = qt_pricelists.id)")
+	if source != "" {
+		query = query.Where("source = ?", source)
+	}
+
 	var total int64
-	if err := r.db.Model(&models.Pricelist{}).Count(&total).Error; err != nil {
+	if err := query.Count(&total).Error; err != nil {
 		return nil, 0, fmt.Errorf("counting pricelists: %w", err)
 	}
 
 	var pricelists []models.Pricelist
-	if err := r.db.Order("created_at DESC").Offset(offset).Limit(limit).Find(&pricelists).Error; err != nil {
+	if err := query.Order("created_at DESC").Offset(offset).Limit(limit).Find(&pricelists).Error; err != nil {
 		return nil, 0, fmt.Errorf("listing pricelists: %w", err)
 	}
 
+	return r.toSummaries(pricelists), total, nil
+}
+
+// ListActive returns active pricelists with pagination.
+func (r *PricelistRepository) ListActive(offset, limit int) ([]models.PricelistSummary, int64, error) {
+	return r.ListActiveBySource("", offset, limit)
+}
+
+// ListActiveBySource returns active pricelists filtered by source when provided.
+func (r *PricelistRepository) ListActiveBySource(source string, offset, limit int) ([]models.PricelistSummary, int64, error) {
+	query := r.db.Model(&models.Pricelist{}).
+		Where("is_active = ?", true).
+		Where("EXISTS (SELECT 1 FROM qt_pricelist_items WHERE qt_pricelist_items.pricelist_id = qt_pricelists.id)")
+	if source != "" {
+		query = query.Where("source = ?", source)
+	}
+
+	var total int64
+	if err := query.Count(&total).Error; err != nil {
+		return nil, 0, fmt.Errorf("counting active pricelists: %w", err)
+	}
+
+	var pricelists []models.Pricelist
+	if err := query.Order("created_at DESC").Offset(offset).Limit(limit).Find(&pricelists).Error; err != nil {
+		return nil, 0, fmt.Errorf("listing active pricelists: %w", err)
+	}
+
+	return r.toSummaries(pricelists), total, nil
+}
+
+// CountActive returns the number of active pricelists.
+func (r *PricelistRepository) CountActive() (int64, error) {
+	var total int64
+	if err := r.db.Model(&models.Pricelist{}).Where("is_active = ?", true).Count(&total).Error; err != nil {
+		return 0, fmt.Errorf("counting active pricelists: %w", err)
+	}
+	return total, nil
+}
+
+func (r *PricelistRepository) toSummaries(pricelists []models.Pricelist) []models.PricelistSummary {
 	// Get item counts for each pricelist
 	summaries := make([]models.PricelistSummary, len(pricelists))
 	for i, pl := range pricelists {
 		var itemCount int64
 		r.db.Model(&models.PricelistItem{}).Where("pricelist_id = ?", pl.ID).Count(&itemCount)
+		usageCount, _ := r.CountUsage(pl.ID)
 
 		summaries[i] = models.PricelistSummary{
 			ID:           pl.ID,
+			Source:       pl.Source,
 			Version:      pl.Version,
 			Notification: pl.Notification,
 			CreatedAt:    pl.CreatedAt,
 			CreatedBy:    pl.CreatedBy,
 			IsActive:     pl.IsActive,
-			UsageCount:   pl.UsageCount,
+			UsageCount:   int(usageCount),
 			ExpiresAt:    pl.ExpiresAt,
 			ItemCount:    itemCount,
 		}
 	}
 
-	return summaries, total, nil
+	return summaries
 }
 
 // GetByID returns a pricelist by ID
@@ -62,14 +119,22 @@ func (r *PricelistRepository) GetByID(id uint) (*models.Pricelist, error) {
 	var itemCount int64
 	r.db.Model(&models.PricelistItem{}).Where("pricelist_id = ?", id).Count(&itemCount)
 	pricelist.ItemCount = int(itemCount)
+	if usageCount, err := r.CountUsage(id); err == nil {
+		pricelist.UsageCount = int(usageCount)
+	}
 
 	return &pricelist, nil
 }
 
 // GetByVersion returns a pricelist by version string
 func (r *PricelistRepository) GetByVersion(version string) (*models.Pricelist, error) {
+	return r.GetBySourceAndVersion(string(models.PricelistSourceEstimate), version)
+}
+
+// GetBySourceAndVersion returns a pricelist by source/version.
+func (r *PricelistRepository) GetBySourceAndVersion(source, version string) (*models.Pricelist, error) {
 	var pricelist models.Pricelist
-	if err := r.db.Where("version = ?", version).First(&pricelist).Error; err != nil {
+	if err := r.db.Where("source = ? AND version = ?", source, version).First(&pricelist).Error; err != nil {
 		return nil, fmt.Errorf("getting pricelist by version: %w", err)
 	}
 	return &pricelist, nil
@@ -77,8 +142,13 @@ func (r *PricelistRepository) GetByVersion(version string) (*models.Pricelist, e
 
 // GetLatestActive returns the most recent active pricelist
 func (r *PricelistRepository) GetLatestActive() (*models.Pricelist, error) {
+	return r.GetLatestActiveBySource(string(models.PricelistSourceEstimate))
+}
+
+// GetLatestActiveBySource returns the most recent active pricelist by source.
+func (r *PricelistRepository) GetLatestActiveBySource(source string) (*models.Pricelist, error) {
 	var pricelist models.Pricelist
-	if err := r.db.Where("is_active = ?", true).Order("created_at DESC").First(&pricelist).Error; err != nil {
+	if err := r.db.Where("is_active = ? AND source = ?", true, source).Order("created_at DESC").First(&pricelist).Error; err != nil {
 		return nil, fmt.Errorf("getting latest pricelist: %w", err)
 	}
 	return &pricelist, nil
@@ -102,13 +172,13 @@ func (r *PricelistRepository) Update(pricelist *models.Pricelist) error {
 
 // Delete deletes a pricelist if usage_count is 0
 func (r *PricelistRepository) Delete(id uint) error {
-	pricelist, err := r.GetByID(id)
+	usageCount, err := r.CountUsage(id)
 	if err != nil {
 		return err
 	}
 
-	if pricelist.UsageCount > 0 {
-		return fmt.Errorf("cannot delete pricelist with usage_count > 0 (current: %d)", pricelist.UsageCount)
+	if usageCount > 0 {
+		return fmt.Errorf("cannot delete pricelist with usage_count > 0 (current: %d)", usageCount)
 	}
 
 	// Delete items first
@@ -175,21 +245,199 @@ func (r *PricelistRepository) GetItems(pricelistID uint, offset, limit int, sear
 		}
 	}
 
+	if err := r.enrichItemsWithStock(items); err != nil {
+		return nil, 0, fmt.Errorf("enriching pricelist items with stock: %w", err)
+	}
+
 	return items, total, nil
 }
 
+func (r *PricelistRepository) enrichItemsWithStock(items []models.PricelistItem) error {
+	if len(items) == 0 {
+		return nil
+	}
+
+	resolver, err := lotmatch.NewLotResolverFromDB(r.db)
+	if err != nil {
+		return err
+	}
+
+	type stockRow struct {
+		Partnumber string   `gorm:"column:partnumber"`
+		Qty        *float64 `gorm:"column:qty"`
+	}
+	rows := make([]stockRow, 0)
+	if err := r.db.Raw(`
+		SELECT s.partnumber, s.qty
+		FROM stock_log s
+		INNER JOIN (
+			SELECT partnumber, MAX(date) AS max_date
+			FROM stock_log
+			GROUP BY partnumber
+		) latest ON latest.partnumber = s.partnumber AND latest.max_date = s.date
+		WHERE s.qty IS NOT NULL
+	`).Scan(&rows).Error; err != nil {
+		return err
+	}
+
+	lotTotals := make(map[string]float64, len(items))
+	lotPartnumbers := make(map[string][]string, len(items))
+	seenPartnumbers := make(map[string]map[string]struct{}, len(items))
+
+	for i := range rows {
+		row := rows[i]
+		if strings.TrimSpace(row.Partnumber) == "" {
+			continue
+		}
+		lotName, _, resolveErr := resolver.Resolve(row.Partnumber)
+		if resolveErr != nil || strings.TrimSpace(lotName) == "" {
+			continue
+		}
+
+		if row.Qty != nil {
+			lotTotals[lotName] += *row.Qty
+		}
+
+		pn := strings.TrimSpace(row.Partnumber)
+		if pn == "" {
+			continue
+		}
+		if _, ok := seenPartnumbers[lotName]; !ok {
+			seenPartnumbers[lotName] = make(map[string]struct{}, 4)
+		}
+		key := strings.ToLower(pn)
+		if _, exists := seenPartnumbers[lotName][key]; exists {
+			continue
+		}
+		seenPartnumbers[lotName][key] = struct{}{}
+		lotPartnumbers[lotName] = append(lotPartnumbers[lotName], pn)
+	}
+
+	for i := range items {
+		lotName := items[i].LotName
+		if qty, ok := lotTotals[lotName]; ok {
+			qtyCopy := qty
+			items[i].AvailableQty = &qtyCopy
+		}
+		if partnumbers := lotPartnumbers[lotName]; len(partnumbers) > 0 {
+			sort.Slice(partnumbers, func(a, b int) bool {
+				return strings.ToLower(partnumbers[a]) < strings.ToLower(partnumbers[b])
+			})
+			items[i].Partnumbers = partnumbers
+		}
+	}
+
+	return nil
+}
+
+// GetLotNames returns distinct lot names from pricelist items.
+func (r *PricelistRepository) GetLotNames(pricelistID uint) ([]string, error) {
+	var lotNames []string
+	if err := r.db.Model(&models.PricelistItem{}).
+		Where("pricelist_id = ?", pricelistID).
+		Distinct("lot_name").
+		Order("lot_name ASC").
+		Pluck("lot_name", &lotNames).Error; err != nil {
+		return nil, fmt.Errorf("listing pricelist lot names: %w", err)
+	}
+	return lotNames, nil
+}
+
+// GetPriceForLot returns item price for a lot within a pricelist.
+func (r *PricelistRepository) GetPriceForLot(pricelistID uint, lotName string) (float64, error) {
+	var item models.PricelistItem
+	if err := r.db.Where("pricelist_id = ? AND lot_name = ?", pricelistID, lotName).First(&item).Error; err != nil {
+		return 0, err
+	}
+	return item.Price, nil
+}
+
+// GetPricesForLots returns price map for given lots within a pricelist.
+func (r *PricelistRepository) GetPricesForLots(pricelistID uint, lotNames []string) (map[string]float64, error) {
+	result := make(map[string]float64, len(lotNames))
+	if pricelistID == 0 || len(lotNames) == 0 {
+		return result, nil
+	}
+
+	var rows []models.PricelistItem
+	if err := r.db.Select("lot_name, price").
+		Where("pricelist_id = ? AND lot_name IN ?", pricelistID, lotNames).
+		Find(&rows).Error; err != nil {
+		return nil, err
+	}
+
+	for _, row := range rows {
+		if row.Price > 0 {
+			result[row.LotName] = row.Price
+		}
+	}
+	return result, nil
+}
+
+// SetActive toggles active flag on a pricelist.
+func (r *PricelistRepository) SetActive(id uint, isActive bool) error {
+	return r.db.Model(&models.Pricelist{}).Where("id = ?", id).Update("is_active", isActive).Error
+}
+
 // GenerateVersion generates a new version string in format YYYY-MM-DD-NNN
 func (r *PricelistRepository) GenerateVersion() (string, error) {
-	today := time.Now().Format("2006-01-02")
+	return r.GenerateVersionBySource(string(models.PricelistSourceEstimate))
+}
 
-	var count int64
-	if err := r.db.Model(&models.Pricelist{}).
-		Where("version LIKE ?", today+"%").
-		Count(&count).Error; err != nil {
-		return "", fmt.Errorf("counting today's pricelists: %w", err)
+// GenerateVersionBySource generates a new version string in format YYYY-MM-DD-NNN scoped by source.
+func (r *PricelistRepository) GenerateVersionBySource(source string) (string, error) {
+	today := time.Now().Format("2006-01-02")
+	prefix := versionPrefixBySource(source)
+
+	var last models.Pricelist
+	err := r.db.Model(&models.Pricelist{}).
+		Select("version").
+		Where("source = ? AND version LIKE ?", source, prefix+"-"+today+"-%").
+		Order("version DESC").
+		Limit(1).
+		Take(&last).Error
+	if err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return fmt.Sprintf("%s-%s-001", prefix, today), nil
+		}
+		return "", fmt.Errorf("loading latest today's pricelist version: %w", err)
 	}
 
-	return fmt.Sprintf("%s-%03d", today, count+1), nil
+	parts := strings.Split(last.Version, "-")
+	if len(parts) < 4 {
+		return "", fmt.Errorf("invalid pricelist version format: %s", last.Version)
+	}
+
+	n, err := strconv.Atoi(parts[len(parts)-1])
+	if err != nil {
+		return "", fmt.Errorf("parsing pricelist sequence %q: %w", parts[len(parts)-1], err)
+	}
+
+	return fmt.Sprintf("%s-%s-%03d", prefix, today, n+1), nil
+}
+
+func versionPrefixBySource(source string) string {
+	switch models.NormalizePricelistSource(source) {
+	case models.PricelistSourceWarehouse:
+		return "S"
+	case models.PricelistSourceCompetitor:
+		return "B"
+	default:
+		return "E"
+	}
+}
+
+// GetPriceForLotBySource returns item price for a lot from latest active pricelist of source.
+func (r *PricelistRepository) GetPriceForLotBySource(source, lotName string) (float64, uint, error) {
+	latest, err := r.GetLatestActiveBySource(source)
+	if err != nil {
+		return 0, 0, err
+	}
+	price, err := r.GetPriceForLot(latest.ID, lotName)
+	if err != nil {
+		return 0, 0, err
+	}
+	return price, latest.ID, nil
 }
 
 // CanWrite checks if the current database user has INSERT permission on qt_pricelists
@@ -248,6 +496,15 @@ func (r *PricelistRepository) DecrementUsageCount(id uint) error {
 		UpdateColumn("usage_count", gorm.Expr("GREATEST(usage_count - 1, 0)")).Error
 }
 
+// CountUsage returns number of configurations referencing pricelist.
+func (r *PricelistRepository) CountUsage(id uint) (int64, error) {
+	var count int64
+	if err := r.db.Table("qt_configurations").Where("pricelist_id = ?", id).Count(&count).Error; err != nil {
+		return 0, fmt.Errorf("counting configurations for pricelist %d: %w", id, err)
+	}
+	return count, nil
+}
+
 // GetExpiredUnused returns pricelists that are expired and unused
 func (r *PricelistRepository) GetExpiredUnused() ([]models.Pricelist, error) {
 	var pricelists []models.Pricelist

internal/repository/pricelist_test.go

@@ -0,0 +1,140 @@
+package repository
+
+import (
+	"fmt"
+	"testing"
+	"time"
+
+	"git.mchus.pro/mchus/quoteforge/internal/models"
+	"github.com/glebarez/sqlite"
+	"gorm.io/gorm"
+)
+
+func TestGenerateVersion_FirstOfDay(t *testing.T) {
+	repo := newTestPricelistRepository(t)
+
+	version, err := repo.GenerateVersionBySource(string(models.PricelistSourceEstimate))
+	if err != nil {
+		t.Fatalf("GenerateVersionBySource returned error: %v", err)
+	}
+
+	today := time.Now().Format("2006-01-02")
+	want := fmt.Sprintf("E-%s-001", today)
+	if version != want {
+		t.Fatalf("expected %s, got %s", want, version)
+	}
+}
+
+func TestGenerateVersion_UsesMaxSuffixNotCount(t *testing.T) {
+	repo := newTestPricelistRepository(t)
+	today := time.Now().Format("2006-01-02")
+
+	seed := []models.Pricelist{
+		{Source: string(models.PricelistSourceEstimate), Version: fmt.Sprintf("E-%s-001", today), CreatedBy: "test", IsActive: true},
+		{Source: string(models.PricelistSourceEstimate), Version: fmt.Sprintf("E-%s-003", today), CreatedBy: "test", IsActive: true},
+	}
+	for _, pl := range seed {
+		if err := repo.Create(&pl); err != nil {
+			t.Fatalf("seed insert failed: %v", err)
+		}
+	}
+
+	version, err := repo.GenerateVersionBySource(string(models.PricelistSourceEstimate))
+	if err != nil {
+		t.Fatalf("GenerateVersionBySource returned error: %v", err)
+	}
+
+	want := fmt.Sprintf("E-%s-004", today)
+	if version != want {
+		t.Fatalf("expected %s, got %s", want, version)
+	}
+}
+
+func TestGenerateVersion_IsolatedBySource(t *testing.T) {
+	repo := newTestPricelistRepository(t)
+	today := time.Now().Format("2006-01-02")
+
+	seed := []models.Pricelist{
+		{Source: string(models.PricelistSourceEstimate), Version: fmt.Sprintf("E-%s-009", today), CreatedBy: "test", IsActive: true},
+		{Source: string(models.PricelistSourceWarehouse), Version: fmt.Sprintf("S-%s-002", today), CreatedBy: "test", IsActive: true},
+	}
+	for _, pl := range seed {
+		if err := repo.Create(&pl); err != nil {
+			t.Fatalf("seed insert failed: %v", err)
+		}
+	}
+
+	version, err := repo.GenerateVersionBySource(string(models.PricelistSourceWarehouse))
+	if err != nil {
+		t.Fatalf("GenerateVersionBySource returned error: %v", err)
+	}
+
+	want := fmt.Sprintf("S-%s-003", today)
+	if version != want {
+		t.Fatalf("expected %s, got %s", want, version)
+	}
+}
+
+func TestGetItems_WarehouseAvailableQtyUsesPrefixResolver(t *testing.T) {
+	repo := newTestPricelistRepository(t)
+	db := repo.db
+
+	warehouse := models.Pricelist{
+		Source:    string(models.PricelistSourceWarehouse),
+		Version:   "S-2026-02-07-001",
+		CreatedBy: "test",
+		IsActive:  true,
+	}
+	if err := db.Create(&warehouse).Error; err != nil {
+		t.Fatalf("create pricelist: %v", err)
+	}
+	if err := db.Create(&models.PricelistItem{
+		PricelistID: warehouse.ID,
+		LotName:     "SSD_NVME_03.2T",
+		Price:       100,
+	}).Error; err != nil {
+		t.Fatalf("create pricelist item: %v", err)
+	}
+	if err := db.Create(&models.Lot{LotName: "SSD_NVME_03.2T"}).Error; err != nil {
+		t.Fatalf("create lot: %v", err)
+	}
+	qty := 5.0
+	if err := db.Create(&models.StockLog{
+		Partnumber: "SSD_NVME_03.2T_GEN3_P4610",
+		Date:       time.Now(),
+		Price:      200,
+		Qty:        &qty,
+	}).Error; err != nil {
+		t.Fatalf("create stock log: %v", err)
+	}
+
+	items, total, err := repo.GetItems(warehouse.ID, 0, 20, "")
+	if err != nil {
+		t.Fatalf("GetItems: %v", err)
+	}
+	if total != 1 {
+		t.Fatalf("expected total=1, got %d", total)
+	}
+	if len(items) != 1 {
+		t.Fatalf("expected 1 item, got %d", len(items))
+	}
+	if items[0].AvailableQty == nil {
+		t.Fatalf("expected available qty to be set")
+	}
+	if *items[0].AvailableQty != 5 {
+		t.Fatalf("expected available qty=5, got %v", *items[0].AvailableQty)
+	}
+}
+
+func newTestPricelistRepository(t *testing.T) *PricelistRepository {
+	t.Helper()
+
+	db, err := gorm.Open(sqlite.Open("file::memory:?cache=shared"), &gorm.Config{})
+	if err != nil {
+		t.Fatalf("open sqlite: %v", err)
+	}
+	if err := db.AutoMigrate(&models.Pricelist{}, &models.PricelistItem{}, &models.Lot{}, &models.LotPartnumber{}, &models.StockLog{}); err != nil {
+		t.Fatalf("migrate: %v", err)
+	}
+	return NewPricelistRepository(db)
+}

internal/repository/project.go

@@ -0,0 +1,194 @@
+package repository
+
+import (
+	"git.mchus.pro/mchus/quoteforge/internal/models"
+	"gorm.io/gorm"
+	"gorm.io/gorm/clause"
+)
+
+type ProjectRepository struct {
+	db *gorm.DB
+}
+
+func NewProjectRepository(db *gorm.DB) *ProjectRepository {
+	return &ProjectRepository{db: db}
+}
+
+func (r *ProjectRepository) Create(project *models.Project) error {
+	return r.db.Create(project).Error
+}
+
+func (r *ProjectRepository) Update(project *models.Project) error {
+	return r.db.Save(project).Error
+}
+
+func (r *ProjectRepository) UpsertByUUID(project *models.Project) error {
+	if err := r.db.Clauses(clause.OnConflict{
+		Columns: []clause.Column{{Name: "uuid"}},
+		DoUpdates: clause.AssignmentColumns([]string{
+			"owner_username",
+			"name",
+			"tracker_url",
+			"is_active",
+			"is_system",
+			"updated_at",
+		}),
+	}).Create(project).Error; err != nil {
+		return err
+	}
+
+	// Ensure caller always gets canonical server ID.
+	var persisted models.Project
+	if err := r.db.Where("uuid = ?", project.UUID).First(&persisted).Error; err != nil {
+		return err
+	}
+	project.ID = persisted.ID
+	return nil
+}
+
+func (r *ProjectRepository) GetByUUID(uuid string) (*models.Project, error) {
+	var project models.Project
+	if err := r.db.Where("uuid = ?", uuid).First(&project).Error; err != nil {
+		return nil, err
+	}
+	return &project, nil
+}
+
+func (r *ProjectRepository) GetSystemByOwner(ownerUsername string) (*models.Project, error) {
+	var project models.Project
+	if err := r.db.Where("owner_username = ? AND is_system = ? AND name = ?", ownerUsername, true, "Без проекта").
+		First(&project).Error; err != nil {
+		return nil, err
+	}
+	return &project, nil
+}
+
+func (r *ProjectRepository) List(offset, limit int, includeArchived bool) ([]models.Project, int64, error) {
+	var projects []models.Project
+	var total int64
+
+	query := r.db.Model(&models.Project{})
+	if !includeArchived {
+		query = query.Where("is_active = ?", true)
+	}
+
+	if err := query.Count(&total).Error; err != nil {
+		return nil, 0, err
+	}
+
+	if err := query.Order("created_at DESC").Offset(offset).Limit(limit).Find(&projects).Error; err != nil {
+		return nil, 0, err
+	}
+
+	return projects, total, nil
+}
+
+func (r *ProjectRepository) ListByOwner(ownerUsername string, includeArchived bool) ([]models.Project, error) {
+	var projects []models.Project
+
+	query := r.db.Where("owner_username = ?", ownerUsername)
+	if !includeArchived {
+		query = query.Where("is_active = ?", true)
+	}
+
+	if err := query.Order("created_at DESC").Find(&projects).Error; err != nil {
+		return nil, err
+	}
+	return projects, nil
+}
+
+func (r *ProjectRepository) Archive(uuid string) error {
+	return r.db.Model(&models.Project{}).Where("uuid = ?", uuid).Update("is_active", false).Error
+}
+
+func (r *ProjectRepository) Reactivate(uuid string) error {
+	return r.db.Model(&models.Project{}).Where("uuid = ?", uuid).Update("is_active", true).Error
+}
+
+// PurgeEmptyNamelessProjects removes service-trash projects that have no configurations attached:
+// 1) projects with empty names;
+// 2) duplicate "Без проекта" rows without configurations (case-insensitive, trimmed).
+func (r *ProjectRepository) PurgeEmptyNamelessProjects() (int64, error) {
+	tx := r.db.Exec(`
+DELETE p
+FROM qt_projects p
+WHERE (
+      TRIM(COALESCE(p.name, '')) = ''
+      OR LOWER(TRIM(COALESCE(p.name, ''))) = LOWER('Без проекта')
+)
+  AND NOT EXISTS (
+      SELECT 1
+      FROM qt_configurations c
+      WHERE c.project_uuid = p.uuid
+  )`)
+	return tx.RowsAffected, tx.Error
+}
+
+// EnsureSystemProjectsAndBackfillConfigurations ensures there is a single shared system project
+// named "Без проекта", reassigns orphan/legacy links to it and removes duplicates.
+func (r *ProjectRepository) EnsureSystemProjectsAndBackfillConfigurations() error {
+	return r.db.Transaction(func(tx *gorm.DB) error {
+		type row struct {
+			UUID string `gorm:"column:uuid"`
+		}
+		var canonical row
+		err := tx.Raw(`
+SELECT uuid
+FROM qt_projects
+WHERE LOWER(TRIM(COALESCE(name, ''))) = LOWER('Без проекта')
+  AND is_system = TRUE
+ORDER BY CASE WHEN TRIM(COALESCE(owner_username, '')) = '' THEN 0 ELSE 1 END, created_at ASC, id ASC
+LIMIT 1`).Scan(&canonical).Error
+		if err != nil {
+			return err
+		}
+		if canonical.UUID == "" {
+			if err := tx.Exec(`
+INSERT INTO qt_projects (uuid, owner_username, name, is_active, is_system, created_at, updated_at)
+VALUES (UUID(), '', 'Без проекта', TRUE, TRUE, NOW(), NOW())`).Error; err != nil {
+				return err
+			}
+			if err := tx.Raw(`
+SELECT uuid
+FROM qt_projects
+WHERE LOWER(TRIM(COALESCE(name, ''))) = LOWER('Без проекта')
+ORDER BY created_at DESC, id DESC
+LIMIT 1`).Scan(&canonical).Error; err != nil {
+				return err
+			}
+			if canonical.UUID == "" {
+				return gorm.ErrRecordNotFound
+			}
+		}
+
+		if err := tx.Exec(`
+UPDATE qt_projects
+SET name = 'Без проекта',
+    is_active = TRUE,
+    is_system = TRUE
+WHERE uuid = ?`, canonical.UUID).Error; err != nil {
+			return err
+		}
+
+		if err := tx.Exec(`
+UPDATE qt_configurations
+SET project_uuid = ?
+WHERE project_uuid IS NULL OR project_uuid = ''`, canonical.UUID).Error; err != nil {
+			return err
+		}
+
+		if err := tx.Exec(`
+UPDATE qt_configurations c
+JOIN qt_projects p ON p.uuid = c.project_uuid
+SET c.project_uuid = ?
+WHERE LOWER(TRIM(COALESCE(p.name, ''))) = LOWER('Без проекта')
+  AND p.uuid <> ?`, canonical.UUID, canonical.UUID).Error; err != nil {
+			return err
+		}
+
+		return tx.Exec(`
+DELETE FROM qt_projects
+WHERE LOWER(TRIM(COALESCE(name, ''))) = LOWER('Без проекта')
+  AND uuid <> ?`, canonical.UUID).Error
+	})
+}

internal/repository/unified.go

@@ -19,7 +19,7 @@ type DataSource interface {
 
 	// Configurations
 	SaveConfiguration(cfg *models.Configuration) error
-	GetConfigurations(userID uint) ([]models.Configuration, error)
+	GetConfigurations(ownerUsername string) ([]models.Configuration, error)
 	GetConfigurationByUUID(uuid string) (*models.Configuration, error)
 	DeleteConfiguration(uuid string) error
 
@@ -83,10 +83,6 @@ func (r *UnifiedRepo) getComponentsOffline(filter ComponentFilter, offset, limit
 		search := "%" + filter.Search + "%"
 		query = query.Where("lot_name LIKE ? OR lot_description LIKE ? OR model LIKE ?", search, search, search)
 	}
-	if filter.HasPrice {
-		query = query.Where("current_price IS NOT NULL AND current_price > 0")
-	}
-
 	var total int64
 	query.Count(&total)
 
@@ -96,8 +92,6 @@ func (r *UnifiedRepo) getComponentsOffline(filter ComponentFilter, offset, limit
 		sortDir = "DESC"
 	}
 	switch filter.SortField {
-	case "current_price":
-		query = query.Order("current_price " + sortDir)
 	case "lot_name":
 		query = query.Order("lot_name " + sortDir)
 	default:
@@ -112,9 +106,8 @@ func (r *UnifiedRepo) getComponentsOffline(filter ComponentFilter, offset, limit
 	result := make([]models.LotMetadata, len(components))
 	for i, comp := range components {
 		result[i] = models.LotMetadata{
-			LotName:      comp.LotName,
-			Model:        comp.Model,
-			CurrentPrice: comp.CurrentPrice,
+			LotName: comp.LotName,
+			Model:   comp.Model,
 			Lot: &models.Lot{
 				LotName:        comp.LotName,
 				LotDescription: comp.LotDescription,
@@ -138,9 +131,8 @@ func (r *UnifiedRepo) GetComponent(lotName string) (*models.LotMetadata, error)
 	}
 
 	return &models.LotMetadata{
-		LotName:      comp.LotName,
-		Model:        comp.Model,
-		CurrentPrice: comp.CurrentPrice,
+		LotName: comp.LotName,
+		Model:   comp.Model,
 		Lot: &models.Lot{
 			LotName:        comp.LotName,
 			LotDescription: comp.LotDescription,
@@ -159,16 +151,17 @@ func (r *UnifiedRepo) SaveConfiguration(cfg *models.Configuration) error {
 
 	// Offline: save to local SQLite and queue for sync
 	localCfg := &localdb.LocalConfiguration{
-		UUID:        cfg.UUID,
-		Name:        cfg.Name,
-		TotalPrice:  cfg.TotalPrice,
-		CustomPrice: cfg.CustomPrice,
-		Notes:       cfg.Notes,
-		IsTemplate:  cfg.IsTemplate,
-		ServerCount: cfg.ServerCount,
-		CreatedAt:   cfg.CreatedAt,
-		UpdatedAt:   time.Now(),
-		SyncStatus:  "pending",
+		UUID:             cfg.UUID,
+		Name:             cfg.Name,
+		TotalPrice:       cfg.TotalPrice,
+		CustomPrice:      cfg.CustomPrice,
+		Notes:            cfg.Notes,
+		IsTemplate:       cfg.IsTemplate,
+		ServerCount:      cfg.ServerCount,
+		CreatedAt:        cfg.CreatedAt,
+		UpdatedAt:        time.Now(),
+		SyncStatus:       "pending",
+		OriginalUsername: cfg.OwnerUsername,
 	}
 
 	// Convert items
@@ -196,10 +189,10 @@ func (r *UnifiedRepo) SaveConfiguration(cfg *models.Configuration) error {
 }
 
 // GetConfigurations returns all configurations for a user
-func (r *UnifiedRepo) GetConfigurations(userID uint) ([]models.Configuration, error) {
+func (r *UnifiedRepo) GetConfigurations(ownerUsername string) ([]models.Configuration, error) {
 	if r.isOnline {
 		repo := NewConfigurationRepository(r.mariaDB)
-		configs, _, err := repo.ListByUser(userID, 0, 1000)
+		configs, _, err := repo.ListByUser(ownerUsername, 0, 1000)
 		return configs, err
 	}
 
@@ -222,15 +215,16 @@ func (r *UnifiedRepo) GetConfigurations(userID uint) ([]models.Configuration, er
 		}
 
 		result[i] = models.Configuration{
-			UUID:        lc.UUID,
-			Name:        lc.Name,
-			Items:       items,
-			TotalPrice:  lc.TotalPrice,
-			CustomPrice: lc.CustomPrice,
-			Notes:       lc.Notes,
-			IsTemplate:  lc.IsTemplate,
-			ServerCount: lc.ServerCount,
-			CreatedAt:   lc.CreatedAt,
+			UUID:          lc.UUID,
+			OwnerUsername: lc.OriginalUsername,
+			Name:          lc.Name,
+			Items:         items,
+			TotalPrice:    lc.TotalPrice,
+			CustomPrice:   lc.CustomPrice,
+			Notes:         lc.Notes,
+			IsTemplate:    lc.IsTemplate,
+			ServerCount:   lc.ServerCount,
+			CreatedAt:     lc.CreatedAt,
 		}
 	}
 

internal/services/alerts/service.go

@@ -1,199 +0,0 @@
-package alerts
-
-import (
-	"fmt"
-	"time"
-
-	"git.mchus.pro/mchus/quoteforge/internal/config"
-	"git.mchus.pro/mchus/quoteforge/internal/models"
-	"git.mchus.pro/mchus/quoteforge/internal/repository"
-)
-
-type Service struct {
-	alertRepo     *repository.AlertRepository
-	componentRepo *repository.ComponentRepository
-	priceRepo     *repository.PriceRepository
-	statsRepo     *repository.StatsRepository
-	config        config.AlertsConfig
-	pricingConfig config.PricingConfig
-}
-
-func NewService(
-	alertRepo *repository.AlertRepository,
-	componentRepo *repository.ComponentRepository,
-	priceRepo *repository.PriceRepository,
-	statsRepo *repository.StatsRepository,
-	alertCfg config.AlertsConfig,
-	pricingCfg config.PricingConfig,
-) *Service {
-	return &Service{
-		alertRepo:     alertRepo,
-		componentRepo: componentRepo,
-		priceRepo:     priceRepo,
-		statsRepo:     statsRepo,
-		config:        alertCfg,
-		pricingConfig: pricingCfg,
-	}
-}
-
-func (s *Service) List(filter repository.AlertFilter, page, perPage int) ([]models.PricingAlert, int64, error) {
-	if page < 1 {
-		page = 1
-	}
-	if perPage < 1 || perPage > 100 {
-		perPage = 20
-	}
-	offset := (page - 1) * perPage
-
-	return s.alertRepo.List(filter, offset, perPage)
-}
-
-func (s *Service) Acknowledge(id uint) error {
-	return s.alertRepo.UpdateStatus(id, models.AlertStatusAcknowledged)
-}
-
-func (s *Service) Resolve(id uint) error {
-	return s.alertRepo.UpdateStatus(id, models.AlertStatusResolved)
-}
-
-func (s *Service) Ignore(id uint) error {
-	return s.alertRepo.UpdateStatus(id, models.AlertStatusIgnored)
-}
-
-func (s *Service) GetNewAlertsCount() (int64, error) {
-	return s.alertRepo.CountByStatus(models.AlertStatusNew)
-}
-
-// CheckAndGenerateAlerts scans components and creates alerts
-func (s *Service) CheckAndGenerateAlerts() error {
-	if !s.config.Enabled {
-		return nil
-	}
-
-	// Get top components by usage
-	topComponents, err := s.statsRepo.GetTopComponents(100)
-	if err != nil {
-		return err
-	}
-
-	for _, stats := range topComponents {
-		component, err := s.componentRepo.GetByLotName(stats.LotName)
-		if err != nil {
-			continue
-		}
-
-		// Check high demand + stale price
-		if err := s.checkHighDemandStalePrice(component, &stats); err != nil {
-			continue
-		}
-
-		// Check trending without price
-		if err := s.checkTrendingNoPrice(component, &stats); err != nil {
-			continue
-		}
-
-		// Check no recent quotes
-		if err := s.checkNoRecentQuotes(component, &stats); err != nil {
-			continue
-		}
-	}
-
-	return nil
-}
-
-func (s *Service) checkHighDemandStalePrice(comp *models.LotMetadata, stats *models.ComponentUsageStats) error {
-	// high_demand_stale_price: >= 5 quotes/month AND price > 60 days old
-	if stats.QuotesLast30d < s.config.HighDemandThreshold {
-		return nil
-	}
-
-	if comp.PriceUpdatedAt == nil {
-		return nil
-	}
-
-	daysSinceUpdate := int(time.Since(*comp.PriceUpdatedAt).Hours() / 24)
-	if daysSinceUpdate <= s.pricingConfig.FreshnessYellowDays {
-		return nil
-	}
-
-	// Check if alert already exists
-	exists, _ := s.alertRepo.ExistsByLotAndType(comp.LotName, models.AlertHighDemandStalePrice)
-	if exists {
-		return nil
-	}
-
-	alert := &models.PricingAlert{
-		LotName:   comp.LotName,
-		AlertType: models.AlertHighDemandStalePrice,
-		Severity:  models.SeverityCritical,
-		Message:   fmt.Sprintf("Компонент %s: высокий спрос (%d КП/мес), но цена устарела (%d дней)", comp.LotName, stats.QuotesLast30d, daysSinceUpdate),
-		Details: models.AlertDetails{
-			"quotes_30d":     stats.QuotesLast30d,
-			"days_since_update": daysSinceUpdate,
-		},
-	}
-
-	return s.alertRepo.Create(alert)
-}
-
-func (s *Service) checkTrendingNoPrice(comp *models.LotMetadata, stats *models.ComponentUsageStats) error {
-	// trending_no_price: trend > 50% AND no price
-	if stats.TrendDirection != models.TrendUp || stats.TrendPercent < float64(s.config.TrendingThresholdPercent) {
-		return nil
-	}
-
-	if comp.CurrentPrice != nil && *comp.CurrentPrice > 0 {
-		return nil
-	}
-
-	exists, _ := s.alertRepo.ExistsByLotAndType(comp.LotName, models.AlertTrendingNoPrice)
-	if exists {
-		return nil
-	}
-
-	alert := &models.PricingAlert{
-		LotName:   comp.LotName,
-		AlertType: models.AlertTrendingNoPrice,
-		Severity:  models.SeverityHigh,
-		Message:   fmt.Sprintf("Компонент %s: рост спроса +%.0f%%, но цена не установлена", comp.LotName, stats.TrendPercent),
-		Details: models.AlertDetails{
-			"trend_percent": stats.TrendPercent,
-		},
-	}
-
-	return s.alertRepo.Create(alert)
-}
-
-func (s *Service) checkNoRecentQuotes(comp *models.LotMetadata, stats *models.ComponentUsageStats) error {
-	// no_recent_quotes: popular component, no supplier quotes > 90 days
-	if stats.QuotesLast30d < 3 {
-		return nil
-	}
-
-	quoteCount, err := s.priceRepo.GetQuoteCount(comp.LotName, s.pricingConfig.FreshnessRedDays)
-	if err != nil {
-		return err
-	}
-
-	if quoteCount > 0 {
-		return nil
-	}
-
-	exists, _ := s.alertRepo.ExistsByLotAndType(comp.LotName, models.AlertNoRecentQuotes)
-	if exists {
-		return nil
-	}
-
-	alert := &models.PricingAlert{
-		LotName:   comp.LotName,
-		AlertType: models.AlertNoRecentQuotes,
-		Severity:  models.SeverityMedium,
-		Message:   fmt.Sprintf("Компонент %s: популярный (%d КП), но нет новых котировок >%d дней", comp.LotName, stats.QuotesLast30d, s.pricingConfig.FreshnessRedDays),
-		Details: models.AlertDetails{
-			"quotes_30d":       stats.QuotesLast30d,
-			"no_quotes_days": s.pricingConfig.FreshnessRedDays,
-		},
-	}
-
-	return s.alertRepo.Create(alert)
-}

internal/services/component.go

@@ -53,7 +53,6 @@ type ComponentView struct {
 	Category        string                `json:"category"`
 	CategoryName    string                `json:"category_name"`
 	Model           string                `json:"model"`
-	CurrentPrice    *float64              `json:"current_price"`
 	PriceFreshness  models.PriceFreshness `json:"price_freshness"`
 	PopularityScore float64               `json:"popularity_score"`
 	Specs           models.Specs          `json:"specs,omitempty"`
@@ -92,7 +91,6 @@ func (s *ComponentService) List(filter repository.ComponentFilter, page, perPage
 		view := ComponentView{
 			LotName:         c.LotName,
 			Model:           c.Model,
-			CurrentPrice:    c.CurrentPrice,
 			PriceFreshness:  c.GetPriceFreshness(30, 60, 90, 3),
 			PopularityScore: c.PopularityScore,
 			Specs:           c.Specs,
@@ -134,7 +132,6 @@ func (s *ComponentService) GetByLotName(lotName string) (*ComponentView, error)
 	view := &ComponentView{
 		LotName:         c.LotName,
 		Model:           c.Model,
-		CurrentPrice:    c.CurrentPrice,
 		PriceFreshness:  c.GetPriceFreshness(30, 60, 90, 3),
 		PopularityScore: c.PopularityScore,
 		Specs:           c.Specs,

internal/services/configuration.go

@@ -4,50 +4,68 @@ import (
 	"errors"
 	"time"
 
-	"github.com/google/uuid"
 	"git.mchus.pro/mchus/quoteforge/internal/models"
 	"git.mchus.pro/mchus/quoteforge/internal/repository"
+	"github.com/google/uuid"
 )
 
 var (
-	ErrConfigNotFound   = errors.New("configuration not found")
-	ErrConfigForbidden  = errors.New("access to configuration forbidden")
+	ErrConfigNotFound  = errors.New("configuration not found")
+	ErrConfigForbidden = errors.New("access to configuration forbidden")
 )
 
 // ConfigurationGetter is an interface for services that can retrieve configurations
 // Used by handlers to work with both ConfigurationService and LocalConfigurationService
 type ConfigurationGetter interface {
-	GetByUUID(uuid string, userID uint) (*models.Configuration, error)
+	GetByUUID(uuid string, ownerUsername string) (*models.Configuration, error)
 }
 
 type ConfigurationService struct {
 	configRepo    *repository.ConfigurationRepository
+	projectRepo   *repository.ProjectRepository
 	componentRepo *repository.ComponentRepository
+	pricelistRepo *repository.PricelistRepository
 	quoteService  *QuoteService
 }
 
 func NewConfigurationService(
 	configRepo *repository.ConfigurationRepository,
+	projectRepo *repository.ProjectRepository,
 	componentRepo *repository.ComponentRepository,
+	pricelistRepo *repository.PricelistRepository,
 	quoteService *QuoteService,
 ) *ConfigurationService {
 	return &ConfigurationService{
 		configRepo:    configRepo,
+		projectRepo:   projectRepo,
 		componentRepo: componentRepo,
+		pricelistRepo: pricelistRepo,
 		quoteService:  quoteService,
 	}
 }
 
 type CreateConfigRequest struct {
-	Name        string              `json:"name"`
-	Items       models.ConfigItems  `json:"items"`
-	CustomPrice *float64            `json:"custom_price"`
-	Notes       string              `json:"notes"`
-	IsTemplate  bool                `json:"is_template"`
-	ServerCount int                 `json:"server_count"`
+	Name        string             `json:"name"`
+	Items       models.ConfigItems `json:"items"`
+	ProjectUUID *string            `json:"project_uuid,omitempty"`
+	CustomPrice *float64           `json:"custom_price"`
+	Notes       string             `json:"notes"`
+	IsTemplate  bool               `json:"is_template"`
+	ServerCount int                `json:"server_count"`
+	PricelistID *uint              `json:"pricelist_id,omitempty"`
+	OnlyInStock bool               `json:"only_in_stock"`
 }
 
-func (s *ConfigurationService) Create(userID uint, req *CreateConfigRequest) (*models.Configuration, error) {
+func (s *ConfigurationService) Create(ownerUsername string, req *CreateConfigRequest) (*models.Configuration, error) {
+	projectUUID, err := s.resolveProjectUUID(ownerUsername, req.ProjectUUID)
+	if err != nil {
+		return nil, err
+	}
+	pricelistID, err := s.resolvePricelistID(req.PricelistID)
+	if err != nil {
+		return nil, err
+	}
+
 	total := req.Items.Total()
 
 	// If server count is greater than 1, multiply the total by server count
@@ -56,15 +74,18 @@ func (s *ConfigurationService) Create(userID uint, req *CreateConfigRequest) (*m
 	}
 
 	config := &models.Configuration{
-		UUID:        uuid.New().String(),
-		UserID:      userID,
-		Name:        req.Name,
-		Items:       req.Items,
-		TotalPrice:  &total,
-		CustomPrice: req.CustomPrice,
-		Notes:       req.Notes,
-		IsTemplate:  req.IsTemplate,
-		ServerCount: req.ServerCount,
+		UUID:          uuid.New().String(),
+		OwnerUsername: ownerUsername,
+		ProjectUUID:   projectUUID,
+		Name:          req.Name,
+		Items:         req.Items,
+		TotalPrice:    &total,
+		CustomPrice:   req.CustomPrice,
+		Notes:         req.Notes,
+		IsTemplate:    req.IsTemplate,
+		ServerCount:   req.ServerCount,
+		PricelistID:   pricelistID,
+		OnlyInStock:   req.OnlyInStock,
 	}
 
 	if err := s.configRepo.Create(config); err != nil {
@@ -77,30 +98,39 @@ func (s *ConfigurationService) Create(userID uint, req *CreateConfigRequest) (*m
 	return config, nil
 }
 
-func (s *ConfigurationService) GetByUUID(uuid string, userID uint) (*models.Configuration, error) {
+func (s *ConfigurationService) GetByUUID(uuid string, ownerUsername string) (*models.Configuration, error) {
 	config, err := s.configRepo.GetByUUID(uuid)
 	if err != nil {
 		return nil, ErrConfigNotFound
 	}
 
 	// Allow access if user owns config or it's a template
-	if config.UserID != userID && !config.IsTemplate {
+	if !s.isOwner(config, ownerUsername) && !config.IsTemplate {
 		return nil, ErrConfigForbidden
 	}
 
 	return config, nil
 }
 
-func (s *ConfigurationService) Update(uuid string, userID uint, req *CreateConfigRequest) (*models.Configuration, error) {
+func (s *ConfigurationService) Update(uuid string, ownerUsername string, req *CreateConfigRequest) (*models.Configuration, error) {
 	config, err := s.configRepo.GetByUUID(uuid)
 	if err != nil {
 		return nil, ErrConfigNotFound
 	}
 
-	if config.UserID != userID {
+	if !s.isOwner(config, ownerUsername) {
 		return nil, ErrConfigForbidden
 	}
 
+	projectUUID, err := s.resolveProjectUUID(ownerUsername, req.ProjectUUID)
+	if err != nil {
+		return nil, err
+	}
+	pricelistID, err := s.resolvePricelistID(req.PricelistID)
+	if err != nil {
+		return nil, err
+	}
+
 	total := req.Items.Total()
 
 	// If server count is greater than 1, multiply the total by server count
@@ -109,12 +139,15 @@ func (s *ConfigurationService) Update(uuid string, userID uint, req *CreateConfi
 	}
 
 	config.Name = req.Name
+	config.ProjectUUID = projectUUID
 	config.Items = req.Items
 	config.TotalPrice = &total
 	config.CustomPrice = req.CustomPrice
 	config.Notes = req.Notes
 	config.IsTemplate = req.IsTemplate
 	config.ServerCount = req.ServerCount
+	config.PricelistID = pricelistID
+	config.OnlyInStock = req.OnlyInStock
 
 	if err := s.configRepo.Update(config); err != nil {
 		return nil, err
@@ -123,26 +156,26 @@ func (s *ConfigurationService) Update(uuid string, userID uint, req *CreateConfi
 	return config, nil
 }
 
-func (s *ConfigurationService) Delete(uuid string, userID uint) error {
+func (s *ConfigurationService) Delete(uuid string, ownerUsername string) error {
 	config, err := s.configRepo.GetByUUID(uuid)
 	if err != nil {
 		return ErrConfigNotFound
 	}
 
-	if config.UserID != userID {
+	if !s.isOwner(config, ownerUsername) {
 		return ErrConfigForbidden
 	}
 
 	return s.configRepo.Delete(config.ID)
 }
 
-func (s *ConfigurationService) Rename(uuid string, userID uint, newName string) (*models.Configuration, error) {
+func (s *ConfigurationService) Rename(uuid string, ownerUsername string, newName string) (*models.Configuration, error) {
 	config, err := s.configRepo.GetByUUID(uuid)
 	if err != nil {
 		return nil, ErrConfigNotFound
 	}
 
-	if config.UserID != userID {
+	if !s.isOwner(config, ownerUsername) {
 		return nil, ErrConfigForbidden
 	}
 
@@ -155,11 +188,22 @@ func (s *ConfigurationService) Rename(uuid string, userID uint, newName string)
 	return config, nil
 }
 
-func (s *ConfigurationService) Clone(configUUID string, userID uint, newName string) (*models.Configuration, error) {
-	original, err := s.GetByUUID(configUUID, userID)
+func (s *ConfigurationService) Clone(configUUID string, ownerUsername string, newName string) (*models.Configuration, error) {
+	return s.CloneToProject(configUUID, ownerUsername, newName, nil)
+}
+
+func (s *ConfigurationService) CloneToProject(configUUID string, ownerUsername string, newName string, projectUUID *string) (*models.Configuration, error) {
+	original, err := s.GetByUUID(configUUID, ownerUsername)
 	if err != nil {
 		return nil, err
 	}
+	resolvedProjectUUID := original.ProjectUUID
+	if projectUUID != nil {
+		resolvedProjectUUID, err = s.resolveProjectUUID(ownerUsername, projectUUID)
+		if err != nil {
+			return nil, err
+		}
+	}
 
 	// Create copy with new UUID and name
 	total := original.Items.Total()
@@ -170,15 +214,18 @@ func (s *ConfigurationService) Clone(configUUID string, userID uint, newName str
 	}
 
 	clone := &models.Configuration{
-		UUID:        uuid.New().String(),
-		UserID:      userID,
-		Name:        newName,
-		Items:       original.Items,
-		TotalPrice:  &total,
-		CustomPrice: original.CustomPrice,
-		Notes:       original.Notes,
-		IsTemplate:  false, // Clone is never a template
-		ServerCount: original.ServerCount,
+		UUID:          uuid.New().String(),
+		OwnerUsername: ownerUsername,
+		ProjectUUID:   resolvedProjectUUID,
+		Name:          newName,
+		Items:         original.Items,
+		TotalPrice:    &total,
+		CustomPrice:   original.CustomPrice,
+		Notes:         original.Notes,
+		IsTemplate:    false, // Clone is never a template
+		ServerCount:   original.ServerCount,
+		PricelistID:   original.PricelistID,
+		OnlyInStock:   original.OnlyInStock,
 	}
 
 	if err := s.configRepo.Create(clone); err != nil {
@@ -188,7 +235,7 @@ func (s *ConfigurationService) Clone(configUUID string, userID uint, newName str
 	return clone, nil
 }
 
-func (s *ConfigurationService) ListByUser(userID uint, page, perPage int) ([]models.Configuration, int64, error) {
+func (s *ConfigurationService) ListByUser(ownerUsername string, page, perPage int) ([]models.Configuration, int64, error) {
 	if page < 1 {
 		page = 1
 	}
@@ -197,7 +244,7 @@ func (s *ConfigurationService) ListByUser(userID uint, page, perPage int) ([]mod
 	}
 	offset := (page - 1) * perPage
 
-	return s.configRepo.ListByUser(userID, offset, perPage)
+	return s.configRepo.ListByUser(ownerUsername, offset, perPage)
 }
 
 // ListAll returns all configurations without user filter (for use when auth is disabled)
@@ -229,18 +276,30 @@ func (s *ConfigurationService) UpdateNoAuth(uuid string, req *CreateConfigReques
 		return nil, ErrConfigNotFound
 	}
 
+	projectUUID, err := s.resolveProjectUUID(config.OwnerUsername, req.ProjectUUID)
+	if err != nil {
+		return nil, err
+	}
+	pricelistID, err := s.resolvePricelistID(req.PricelistID)
+	if err != nil {
+		return nil, err
+	}
+
 	total := req.Items.Total()
 	if req.ServerCount > 1 {
 		total *= float64(req.ServerCount)
 	}
 
 	config.Name = req.Name
+	config.ProjectUUID = projectUUID
 	config.Items = req.Items
 	config.TotalPrice = &total
 	config.CustomPrice = req.CustomPrice
 	config.Notes = req.Notes
 	config.IsTemplate = req.IsTemplate
 	config.ServerCount = req.ServerCount
+	config.PricelistID = pricelistID
+	config.OnlyInStock = req.OnlyInStock
 
 	if err := s.configRepo.Update(config); err != nil {
 		return nil, err
@@ -274,11 +333,22 @@ func (s *ConfigurationService) RenameNoAuth(uuid string, newName string) (*model
 }
 
 // CloneNoAuth clones configuration without ownership check
-func (s *ConfigurationService) CloneNoAuth(configUUID string, newName string, userID uint) (*models.Configuration, error) {
+func (s *ConfigurationService) CloneNoAuth(configUUID string, newName string, ownerUsername string) (*models.Configuration, error) {
+	return s.CloneNoAuthToProject(configUUID, newName, ownerUsername, nil)
+}
+
+func (s *ConfigurationService) CloneNoAuthToProject(configUUID string, newName string, ownerUsername string, projectUUID *string) (*models.Configuration, error) {
 	original, err := s.configRepo.GetByUUID(configUUID)
 	if err != nil {
 		return nil, ErrConfigNotFound
 	}
+	resolvedProjectUUID := original.ProjectUUID
+	if projectUUID != nil {
+		resolvedProjectUUID, err = s.resolveProjectUUID(ownerUsername, projectUUID)
+		if err != nil {
+			return nil, err
+		}
+	}
 
 	total := original.Items.Total()
 	if original.ServerCount > 1 {
@@ -286,15 +356,18 @@ func (s *ConfigurationService) CloneNoAuth(configUUID string, newName string, us
 	}
 
 	clone := &models.Configuration{
-		UUID:        uuid.New().String(),
-		UserID:      userID, // Use provided user ID
-		Name:        newName,
-		Items:       original.Items,
-		TotalPrice:  &total,
-		CustomPrice: original.CustomPrice,
-		Notes:       original.Notes,
-		IsTemplate:  false,
-		ServerCount: original.ServerCount,
+		UUID:          uuid.New().String(),
+		OwnerUsername: ownerUsername,
+		ProjectUUID:   resolvedProjectUUID,
+		Name:          newName,
+		Items:         original.Items,
+		TotalPrice:    &total,
+		CustomPrice:   original.CustomPrice,
+		Notes:         original.Notes,
+		IsTemplate:    false,
+		ServerCount:   original.ServerCount,
+		PricelistID:   original.PricelistID,
+		OnlyInStock:   original.OnlyInStock,
 	}
 
 	if err := s.configRepo.Create(clone); err != nil {
@@ -304,6 +377,43 @@ func (s *ConfigurationService) CloneNoAuth(configUUID string, newName string, us
 	return clone, nil
 }
 
+func (s *ConfigurationService) resolveProjectUUID(ownerUsername string, projectUUID *string) (*string, error) {
+	_ = ownerUsername
+	if s.projectRepo == nil {
+		return projectUUID, nil
+	}
+	if projectUUID == nil || *projectUUID == "" {
+		return nil, nil
+	}
+
+	project, err := s.projectRepo.GetByUUID(*projectUUID)
+	if err != nil {
+		return nil, ErrProjectNotFound
+	}
+	if !project.IsActive {
+		return nil, errors.New("project is archived")
+	}
+
+	return &project.UUID, nil
+}
+
+func (s *ConfigurationService) resolvePricelistID(pricelistID *uint) (*uint, error) {
+	if s.pricelistRepo == nil {
+		return pricelistID, nil
+	}
+	if pricelistID != nil && *pricelistID > 0 {
+		if _, err := s.pricelistRepo.GetByID(*pricelistID); err != nil {
+			return nil, err
+		}
+		return pricelistID, nil
+	}
+	latest, err := s.pricelistRepo.GetLatestActive()
+	if err != nil {
+		return nil, nil
+	}
+	return &latest.ID, nil
+}
+
 // RefreshPricesNoAuth refreshes prices without ownership check
 func (s *ConfigurationService) RefreshPricesNoAuth(uuid string) (*models.Configuration, error) {
 	config, err := s.configRepo.GetByUUID(uuid)
@@ -311,8 +421,30 @@ func (s *ConfigurationService) RefreshPricesNoAuth(uuid string) (*models.Configu
 		return nil, ErrConfigNotFound
 	}
 
+	var latestPricelistID *uint
+	if s.pricelistRepo != nil {
+		if pl, err := s.pricelistRepo.GetLatestActive(); err == nil {
+			latestPricelistID = &pl.ID
+		}
+	}
+
 	updatedItems := make(models.ConfigItems, len(config.Items))
 	for i, item := range config.Items {
+		if latestPricelistID != nil {
+			if price, err := s.pricelistRepo.GetPriceForLot(*latestPricelistID, item.LotName); err == nil && price > 0 {
+				updatedItems[i] = models.ConfigItem{
+					LotName:   item.LotName,
+					Quantity:  item.Quantity,
+					UnitPrice: price,
+				}
+				continue
+			}
+		}
+
+		if s.componentRepo == nil {
+			updatedItems[i] = item
+			continue
+		}
 		metadata, err := s.componentRepo.GetByLotName(item.LotName)
 		if err != nil || metadata.CurrentPrice == nil {
 			updatedItems[i] = item
@@ -333,6 +465,9 @@ func (s *ConfigurationService) RefreshPricesNoAuth(uuid string) (*models.Configu
 	}
 
 	config.TotalPrice = &total
+	if latestPricelistID != nil {
+		config.PricelistID = latestPricelistID
+	}
 	now := time.Now()
 	config.PriceUpdatedAt = &now
 
@@ -356,20 +491,42 @@ func (s *ConfigurationService) ListTemplates(page, perPage int) ([]models.Config
 }
 
 // RefreshPrices updates all component prices in the configuration with current prices
-func (s *ConfigurationService) RefreshPrices(uuid string, userID uint) (*models.Configuration, error) {
+func (s *ConfigurationService) RefreshPrices(uuid string, ownerUsername string) (*models.Configuration, error) {
 	config, err := s.configRepo.GetByUUID(uuid)
 	if err != nil {
 		return nil, ErrConfigNotFound
 	}
 
-	if config.UserID != userID {
+	if !s.isOwner(config, ownerUsername) {
 		return nil, ErrConfigForbidden
 	}
 
+	var latestPricelistID *uint
+	if s.pricelistRepo != nil {
+		if pl, err := s.pricelistRepo.GetLatestActive(); err == nil {
+			latestPricelistID = &pl.ID
+		}
+	}
+
 	// Update prices for all items
 	updatedItems := make(models.ConfigItems, len(config.Items))
 	for i, item := range config.Items {
+		if latestPricelistID != nil {
+			if price, err := s.pricelistRepo.GetPriceForLot(*latestPricelistID, item.LotName); err == nil && price > 0 {
+				updatedItems[i] = models.ConfigItem{
+					LotName:   item.LotName,
+					Quantity:  item.Quantity,
+					UnitPrice: price,
+				}
+				continue
+			}
+		}
+
 		// Get current component price
+		if s.componentRepo == nil {
+			updatedItems[i] = item
+			continue
+		}
 		metadata, err := s.componentRepo.GetByLotName(item.LotName)
 		if err != nil || metadata.CurrentPrice == nil {
 			// Keep original item if component not found or no price available
@@ -395,6 +552,9 @@ func (s *ConfigurationService) RefreshPrices(uuid string, userID uint) (*models.
 	}
 
 	config.TotalPrice = &total
+	if latestPricelistID != nil {
+		config.PricelistID = latestPricelistID
+	}
 
 	// Set price update timestamp
 	now := time.Now()
@@ -407,6 +567,19 @@ func (s *ConfigurationService) RefreshPrices(uuid string, userID uint) (*models.
 	return config, nil
 }
 
+func (s *ConfigurationService) isOwner(config *models.Configuration, ownerUsername string) bool {
+	if config == nil || ownerUsername == "" {
+		return false
+	}
+	if config.OwnerUsername != "" {
+		return config.OwnerUsername == ownerUsername
+	}
+	if config.User != nil {
+		return config.User.Username == ownerUsername
+	}
+	return false
+}
+
 // // Export configuration as JSON
 // type ConfigExport struct {
 // 	Name  string             `json:"name"`

internal/services/export.go

@@ -4,6 +4,8 @@ import (
 	"bytes"
 	"encoding/csv"
 	"fmt"
+	"io"
+	"strings"
 	"time"
 
 	"git.mchus.pro/mchus/quoteforge/internal/config"
@@ -40,14 +42,21 @@ type ExportItem struct {
 	TotalPrice  float64
 }
 
-func (s *ExportService) ToCSV(data *ExportData) ([]byte, error) {
-	var buf bytes.Buffer
-	w := csv.NewWriter(&buf)
+func (s *ExportService) ToCSV(w io.Writer, data *ExportData) error {
+	// Write UTF-8 BOM for Excel compatibility
+	if _, err := w.Write([]byte{0xEF, 0xBB, 0xBF}); err != nil {
+		return fmt.Errorf("failed to write BOM: %w", err)
+	}
+
+	csvWriter := csv.NewWriter(w)
+	// Use semicolon as delimiter for Russian Excel locale
+	csvWriter.Comma = ';'
+	defer csvWriter.Flush()
 
 	// Header
 	headers := []string{"Артикул", "Описание", "Категория", "Количество", "Цена за единицу", "Сумма"}
-	if err := w.Write(headers); err != nil {
-		return nil, err
+	if err := csvWriter.Write(headers); err != nil {
+		return fmt.Errorf("failed to write header: %w", err)
 	}
 
 	// Get category hierarchy for sorting
@@ -90,21 +99,35 @@ func (s *ExportService) ToCSV(data *ExportData) ([]byte, error) {
 			item.Description,
 			item.Category,
 			fmt.Sprintf("%d", item.Quantity),
-			fmt.Sprintf("%.2f", item.UnitPrice),
-			fmt.Sprintf("%.2f", item.TotalPrice),
+			strings.ReplaceAll(fmt.Sprintf("%.2f", item.UnitPrice), ".", ","),
+			strings.ReplaceAll(fmt.Sprintf("%.2f", item.TotalPrice), ".", ","),
 		}
-		if err := w.Write(row); err != nil {
-			return nil, err
+		if err := csvWriter.Write(row); err != nil {
+			return fmt.Errorf("failed to write row: %w", err)
 		}
 	}
 
 	// Total row
-	if err := w.Write([]string{"", "", "", "", "ИТОГО:", fmt.Sprintf("%.2f", data.Total)}); err != nil {
-		return nil, err
+	totalStr := strings.ReplaceAll(fmt.Sprintf("%.2f", data.Total), ".", ",")
+	if err := csvWriter.Write([]string{"", "", "", "", "ИТОГО:", totalStr}); err != nil {
+		return fmt.Errorf("failed to write total row: %w", err)
 	}
 
-	w.Flush()
-	return buf.Bytes(), w.Error()
+	csvWriter.Flush()
+	if err := csvWriter.Error(); err != nil {
+		return fmt.Errorf("csv writer error: %w", err)
+	}
+
+	return nil
+}
+
+// ToCSVBytes is a backward-compatible wrapper that returns CSV data as bytes
+func (s *ExportService) ToCSVBytes(data *ExportData) ([]byte, error) {
+	var buf bytes.Buffer
+	if err := s.ToCSV(&buf, data); err != nil {
+		return nil, err
+	}
+	return buf.Bytes(), nil
 }
 
 func (s *ExportService) ConfigToExportData(config *models.Configuration, componentService *ComponentService) *ExportData {

internal/services/export_test.go

@@ -0,0 +1,343 @@
+package services
+
+import (
+	"bytes"
+	"encoding/csv"
+	"io"
+	"testing"
+	"time"
+
+	"git.mchus.pro/mchus/quoteforge/internal/config"
+)
+
+
+func TestToCSV_UTF8BOM(t *testing.T) {
+	svc := NewExportService(config.ExportConfig{}, nil)
+
+	data := &ExportData{
+		Name: "Test",
+		Items: []ExportItem{
+			{
+				LotName:     "LOT-001",
+				Description: "Test Item",
+				Category:    "CAT",
+				Quantity:    1,
+				UnitPrice:   100.0,
+				TotalPrice:  100.0,
+			},
+		},
+		Total:     100.0,
+		CreatedAt: time.Now(),
+	}
+
+	var buf bytes.Buffer
+	if err := svc.ToCSV(&buf, data); err != nil {
+		t.Fatalf("ToCSV failed: %v", err)
+	}
+
+	csvBytes := buf.Bytes()
+	if len(csvBytes) < 3 {
+		t.Fatalf("CSV too short to contain BOM")
+	}
+
+	// Check UTF-8 BOM: 0xEF 0xBB 0xBF
+	expectedBOM := []byte{0xEF, 0xBB, 0xBF}
+	actualBOM := csvBytes[:3]
+
+	if bytes.Compare(actualBOM, expectedBOM) != 0 {
+		t.Errorf("UTF-8 BOM mismatch. Expected %v, got %v", expectedBOM, actualBOM)
+	}
+}
+
+func TestToCSV_SemicolonDelimiter(t *testing.T) {
+	svc := NewExportService(config.ExportConfig{}, nil)
+
+	data := &ExportData{
+		Name: "Test",
+		Items: []ExportItem{
+			{
+				LotName:     "LOT-001",
+				Description: "Test Item",
+				Category:    "CAT",
+				Quantity:    2,
+				UnitPrice:   100.50,
+				TotalPrice:  201.00,
+			},
+		},
+		Total:     201.00,
+		CreatedAt: time.Now(),
+	}
+
+	var buf bytes.Buffer
+	if err := svc.ToCSV(&buf, data); err != nil {
+		t.Fatalf("ToCSV failed: %v", err)
+	}
+
+	// Skip BOM and read CSV with semicolon delimiter
+	csvBytes := buf.Bytes()
+	reader := csv.NewReader(bytes.NewReader(csvBytes[3:]))
+	reader.Comma = ';'
+
+	// Read header
+	header, err := reader.Read()
+	if err != nil {
+		t.Fatalf("Failed to read header: %v", err)
+	}
+
+	if len(header) != 6 {
+		t.Errorf("Expected 6 columns, got %d", len(header))
+	}
+
+	expectedHeader := []string{"Артикул", "Описание", "Категория", "Количество", "Цена за единицу", "Сумма"}
+	for i, col := range expectedHeader {
+		if i < len(header) && header[i] != col {
+			t.Errorf("Column %d: expected %q, got %q", i, col, header[i])
+		}
+	}
+
+	// Read item row
+	itemRow, err := reader.Read()
+	if err != nil {
+		t.Fatalf("Failed to read item row: %v", err)
+	}
+
+	if itemRow[0] != "LOT-001" {
+		t.Errorf("Lot name mismatch: expected LOT-001, got %s", itemRow[0])
+	}
+
+	if itemRow[3] != "2" {
+		t.Errorf("Quantity mismatch: expected 2, got %s", itemRow[3])
+	}
+
+	if itemRow[4] != "100,50" {
+		t.Errorf("Unit price mismatch: expected 100,50, got %s", itemRow[4])
+	}
+}
+
+func TestToCSV_TotalRow(t *testing.T) {
+	svc := NewExportService(config.ExportConfig{}, nil)
+
+	data := &ExportData{
+		Name: "Test",
+		Items: []ExportItem{
+			{
+				LotName:     "LOT-001",
+				Description: "Item 1",
+				Category:    "CAT",
+				Quantity:    1,
+				UnitPrice:   100.0,
+				TotalPrice:  100.0,
+			},
+			{
+				LotName:     "LOT-002",
+				Description: "Item 2",
+				Category:    "CAT",
+				Quantity:    2,
+				UnitPrice:   50.0,
+				TotalPrice:  100.0,
+			},
+		},
+		Total:     200.0,
+		CreatedAt: time.Now(),
+	}
+
+	var buf bytes.Buffer
+	if err := svc.ToCSV(&buf, data); err != nil {
+		t.Fatalf("ToCSV failed: %v", err)
+	}
+
+	csvBytes := buf.Bytes()
+	reader := csv.NewReader(bytes.NewReader(csvBytes[3:]))
+	reader.Comma = ';'
+
+	// Skip header and item rows
+	reader.Read()
+	reader.Read()
+	reader.Read()
+
+	// Read total row
+	totalRow, err := reader.Read()
+	if err != nil {
+		t.Fatalf("Failed to read total row: %v", err)
+	}
+
+	// Total row should have "ИТОГО:" in position 4 and total value in position 5
+	if totalRow[4] != "ИТОГО:" {
+		t.Errorf("Expected 'ИТОГО:' in column 4, got %q", totalRow[4])
+	}
+
+	if totalRow[5] != "200,00" {
+		t.Errorf("Expected total 200,00, got %s", totalRow[5])
+	}
+}
+
+func TestToCSV_CategorySorting(t *testing.T) {
+	// Test category sorting without category repo (items maintain original order)
+	svc := NewExportService(config.ExportConfig{}, nil)
+
+	data := &ExportData{
+		Name: "Test",
+		Items: []ExportItem{
+			{
+				LotName:     "LOT-001",
+				Category:    "CAT-A",
+				Quantity:    1,
+				UnitPrice:   100.0,
+				TotalPrice:  100.0,
+			},
+			{
+				LotName:     "LOT-002",
+				Category:    "CAT-C",
+				Quantity:    1,
+				UnitPrice:   100.0,
+				TotalPrice:  100.0,
+			},
+			{
+				LotName:     "LOT-003",
+				Category:    "CAT-B",
+				Quantity:    1,
+				UnitPrice:   100.0,
+				TotalPrice:  100.0,
+			},
+		},
+		Total:     300.0,
+		CreatedAt: time.Now(),
+	}
+
+	var buf bytes.Buffer
+	if err := svc.ToCSV(&buf, data); err != nil {
+		t.Fatalf("ToCSV failed: %v", err)
+	}
+
+	csvBytes := buf.Bytes()
+	reader := csv.NewReader(bytes.NewReader(csvBytes[3:]))
+	reader.Comma = ';'
+
+	// Skip header
+	reader.Read()
+
+	// Without category repo, items maintain original order
+	row1, _ := reader.Read()
+	if row1[0] != "LOT-001" {
+		t.Errorf("Expected LOT-001 first, got %s", row1[0])
+	}
+
+	row2, _ := reader.Read()
+	if row2[0] != "LOT-002" {
+		t.Errorf("Expected LOT-002 second, got %s", row2[0])
+	}
+
+	row3, _ := reader.Read()
+	if row3[0] != "LOT-003" {
+		t.Errorf("Expected LOT-003 third, got %s", row3[0])
+	}
+}
+
+func TestToCSV_EmptyData(t *testing.T) {
+	svc := NewExportService(config.ExportConfig{}, nil)
+
+	data := &ExportData{
+		Name:      "Test",
+		Items:     []ExportItem{},
+		Total:     0.0,
+		CreatedAt: time.Now(),
+	}
+
+	var buf bytes.Buffer
+	if err := svc.ToCSV(&buf, data); err != nil {
+		t.Fatalf("ToCSV failed: %v", err)
+	}
+
+	csvBytes := buf.Bytes()
+	reader := csv.NewReader(bytes.NewReader(csvBytes[3:]))
+	reader.Comma = ';'
+
+	// Should have header and total row
+	header, err := reader.Read()
+	if err != nil {
+		t.Fatalf("Failed to read header: %v", err)
+	}
+
+	if len(header) != 6 {
+		t.Errorf("Expected 6 columns, got %d", len(header))
+	}
+
+	totalRow, err := reader.Read()
+	if err != nil {
+		t.Fatalf("Failed to read total row: %v", err)
+	}
+
+	if totalRow[4] != "ИТОГО:" {
+		t.Errorf("Expected ИТОГО: in total row, got %s", totalRow[4])
+	}
+}
+
+func TestToCSVBytes_BackwardCompat(t *testing.T) {
+	svc := NewExportService(config.ExportConfig{}, nil)
+
+	data := &ExportData{
+		Name: "Test",
+		Items: []ExportItem{
+			{
+				LotName:     "LOT-001",
+				Description: "Test Item",
+				Category:    "CAT",
+				Quantity:    1,
+				UnitPrice:   100.0,
+				TotalPrice:  100.0,
+			},
+		},
+		Total:     100.0,
+		CreatedAt: time.Now(),
+	}
+
+	csvBytes, err := svc.ToCSVBytes(data)
+	if err != nil {
+		t.Fatalf("ToCSVBytes failed: %v", err)
+	}
+
+	if len(csvBytes) < 3 {
+		t.Fatalf("CSV bytes too short")
+	}
+
+	// Verify BOM is present
+	expectedBOM := []byte{0xEF, 0xBB, 0xBF}
+	actualBOM := csvBytes[:3]
+	if bytes.Compare(actualBOM, expectedBOM) != 0 {
+		t.Errorf("UTF-8 BOM mismatch in ToCSVBytes")
+	}
+}
+
+func TestToCSV_WriterError(t *testing.T) {
+	svc := NewExportService(config.ExportConfig{}, nil)
+
+	data := &ExportData{
+		Name: "Test",
+		Items: []ExportItem{
+			{
+				LotName:     "LOT-001",
+				Description: "Test",
+				Category:    "CAT",
+				Quantity:    1,
+				UnitPrice:   100.0,
+				TotalPrice:  100.0,
+			},
+		},
+		Total:     100.0,
+		CreatedAt: time.Now(),
+	}
+
+	// Use a failing writer
+	failingWriter := &failingWriter{}
+
+	if err := svc.ToCSV(failingWriter, data); err == nil {
+		t.Errorf("Expected error from failing writer, got nil")
+	}
+}
+
+// failingWriter always returns an error
+type failingWriter struct{}
+
+func (fw *failingWriter) Write(p []byte) (int, error) {
+	return 0, io.EOF
+}

internal/services/local_configuration_versioning_test.go

@@ -0,0 +1,399 @@
+package services
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"path/filepath"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+
+	"git.mchus.pro/mchus/quoteforge/internal/localdb"
+	"git.mchus.pro/mchus/quoteforge/internal/models"
+	syncsvc "git.mchus.pro/mchus/quoteforge/internal/services/sync"
+)
+
+func TestSaveCreatesNewVersionAndUpdatesCurrentPointer(t *testing.T) {
+	service, local := newLocalConfigServiceForTest(t)
+
+	created, err := service.Create("tester", &CreateConfigRequest{
+		Name:        "v1",
+		Items:       models.ConfigItems{{LotName: "CPU_A", Quantity: 1, UnitPrice: 1000}},
+		ServerCount: 1,
+	})
+	if err != nil {
+		t.Fatalf("create config: %v", err)
+	}
+
+	if _, err := service.RenameNoAuth(created.UUID, "v2"); err != nil {
+		t.Fatalf("rename config: %v", err)
+	}
+
+	versions := loadVersions(t, local, created.UUID)
+	if len(versions) != 2 {
+		t.Fatalf("expected 2 versions, got %d", len(versions))
+	}
+	if versions[0].VersionNo != 1 || versions[1].VersionNo != 2 {
+		t.Fatalf("expected version_no [1,2], got [%d,%d]", versions[0].VersionNo, versions[1].VersionNo)
+	}
+
+	cfg, err := local.GetConfigurationByUUID(created.UUID)
+	if err != nil {
+		t.Fatalf("load local config: %v", err)
+	}
+	if cfg.CurrentVersionID == nil || *cfg.CurrentVersionID != versions[1].ID {
+		t.Fatalf("current_version_id should point to v2")
+	}
+}
+
+func TestRollbackCreatesNewVersionWithTargetData(t *testing.T) {
+	service, local := newLocalConfigServiceForTest(t)
+
+	created, err := service.Create("tester", &CreateConfigRequest{
+		Name:        "base",
+		Items:       models.ConfigItems{{LotName: "RAM_A", Quantity: 2, UnitPrice: 100}},
+		ServerCount: 1,
+	})
+	if err != nil {
+		t.Fatalf("create config: %v", err)
+	}
+
+	if _, err := service.RenameNoAuth(created.UUID, "changed"); err != nil {
+		t.Fatalf("rename config: %v", err)
+	}
+	if _, err := service.RollbackToVersionWithNote(created.UUID, 1, "tester", "test rollback"); err != nil {
+		t.Fatalf("rollback to v1: %v", err)
+	}
+
+	versions := loadVersions(t, local, created.UUID)
+	if len(versions) != 3 {
+		t.Fatalf("expected 3 versions, got %d", len(versions))
+	}
+	if versions[2].VersionNo != 3 {
+		t.Fatalf("expected v3 as rollback version, got v%d", versions[2].VersionNo)
+	}
+	if versions[2].Data != versions[0].Data {
+		t.Fatalf("expected rollback snapshot data equal to v1 data")
+	}
+}
+
+func TestAppendOnlyInvariantOldRowsUnchanged(t *testing.T) {
+	service, local := newLocalConfigServiceForTest(t)
+
+	created, err := service.Create("tester", &CreateConfigRequest{
+		Name:        "initial",
+		Items:       models.ConfigItems{{LotName: "SSD_A", Quantity: 1, UnitPrice: 300}},
+		ServerCount: 1,
+	})
+	if err != nil {
+		t.Fatalf("create config: %v", err)
+	}
+
+	versionsBefore := loadVersions(t, local, created.UUID)
+	if len(versionsBefore) != 1 {
+		t.Fatalf("expected exactly one version after create")
+	}
+	v1Before := versionsBefore[0]
+
+	if _, err := service.RenameNoAuth(created.UUID, "after-rename"); err != nil {
+		t.Fatalf("rename config: %v", err)
+	}
+	if _, err := service.RollbackToVersion(created.UUID, 1, "tester"); err != nil {
+		t.Fatalf("rollback: %v", err)
+	}
+
+	versionsAfter := loadVersions(t, local, created.UUID)
+	if len(versionsAfter) != 3 {
+		t.Fatalf("expected 3 versions, got %d", len(versionsAfter))
+	}
+	v1After := versionsAfter[0]
+
+	if v1After.ID != v1Before.ID {
+		t.Fatalf("v1 id changed: before=%s after=%s", v1Before.ID, v1After.ID)
+	}
+	if v1After.Data != v1Before.Data {
+		t.Fatalf("v1 data changed")
+	}
+	if !v1After.CreatedAt.Equal(v1Before.CreatedAt) {
+		t.Fatalf("v1 created_at changed")
+	}
+}
+
+func TestConcurrentSaveNoDuplicateVersionNumbers(t *testing.T) {
+	service, local := newLocalConfigServiceForTest(t)
+
+	created, err := service.Create("tester", &CreateConfigRequest{
+		Name:        "base",
+		Items:       models.ConfigItems{{LotName: "NIC_A", Quantity: 1, UnitPrice: 150}},
+		ServerCount: 1,
+	})
+	if err != nil {
+		t.Fatalf("create config: %v", err)
+	}
+
+	const workers = 8
+	start := make(chan struct{})
+	errCh := make(chan error, workers)
+	var wg sync.WaitGroup
+
+	for i := 0; i < workers; i++ {
+		i := i
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			<-start
+			if err := renameWithRetry(service, created.UUID, fmt.Sprintf("name-%d", i)); err != nil {
+				errCh <- err
+			}
+		}()
+	}
+
+	close(start)
+	wg.Wait()
+	close(errCh)
+
+	for err := range errCh {
+		if err != nil {
+			t.Fatalf("concurrent save failed: %v", err)
+		}
+	}
+
+	type counts struct {
+		Total         int64
+		DistinctCount int64
+		Max           int
+	}
+	var c counts
+	if err := local.DB().Raw(`
+SELECT
+	COUNT(*) as total,
+	COUNT(DISTINCT version_no) as distinct_count,
+	COALESCE(MAX(version_no), 0) as max
+FROM local_configuration_versions
+WHERE configuration_uuid = ?`, created.UUID).Scan(&c).Error; err != nil {
+		t.Fatalf("query version counts: %v", err)
+	}
+
+	if c.Total != c.DistinctCount {
+		t.Fatalf("duplicate version numbers detected: total=%d distinct=%d", c.Total, c.DistinctCount)
+	}
+	expected := int64(workers + 1) // initial create version + each successful save
+	if c.Total != expected || c.Max != int(expected) {
+		t.Fatalf("expected total=max=%d, got total=%d max=%d", expected, c.Total, c.Max)
+	}
+}
+
+func TestUpdateNoAuthKeepsProjectWhenProjectUUIDOmitted(t *testing.T) {
+	service, local := newLocalConfigServiceForTest(t)
+
+	project := &localdb.LocalProject{
+		UUID:          "project-keep",
+		OwnerUsername: "tester",
+		Name:          "Keep Project",
+		IsActive:      true,
+		CreatedAt:     time.Now(),
+		UpdatedAt:     time.Now(),
+		SyncStatus:    "synced",
+	}
+	if err := local.SaveProject(project); err != nil {
+		t.Fatalf("save project: %v", err)
+	}
+
+	created, err := service.Create("tester", &CreateConfigRequest{
+		Name:        "cfg",
+		ProjectUUID: &project.UUID,
+		Items:       models.ConfigItems{{LotName: "CPU_A", Quantity: 1, UnitPrice: 100}},
+		ServerCount: 1,
+	})
+	if err != nil {
+		t.Fatalf("create config: %v", err)
+	}
+	if created.ProjectUUID == nil || *created.ProjectUUID != project.UUID {
+		t.Fatalf("expected created config project_uuid=%s", project.UUID)
+	}
+
+	updated, err := service.UpdateNoAuth(created.UUID, &CreateConfigRequest{
+		Name:        "cfg-updated",
+		Items:       models.ConfigItems{{LotName: "CPU_A", Quantity: 2, UnitPrice: 100}},
+		ServerCount: 1,
+	})
+	if err != nil {
+		t.Fatalf("update config without project_uuid: %v", err)
+	}
+	if updated.ProjectUUID == nil || *updated.ProjectUUID != project.UUID {
+		t.Fatalf("expected project_uuid to stay %s after update, got %+v", project.UUID, updated.ProjectUUID)
+	}
+}
+
+func newLocalConfigServiceForTest(t *testing.T) (*LocalConfigurationService, *localdb.LocalDB) {
+	t.Helper()
+
+	dbPath := filepath.Join(t.TempDir(), "local.db")
+	local, err := localdb.New(dbPath)
+	if err != nil {
+		t.Fatalf("init local db: %v", err)
+	}
+	t.Cleanup(func() {
+		_ = local.Close()
+	})
+
+	return NewLocalConfigurationService(
+		local,
+		syncsvc.NewService(nil, local),
+		&QuoteService{},
+		func() bool { return false },
+	), local
+}
+
+func loadVersions(t *testing.T, local *localdb.LocalDB, configurationUUID string) []localdb.LocalConfigurationVersion {
+	t.Helper()
+	var versions []localdb.LocalConfigurationVersion
+	if err := local.DB().
+		Where("configuration_uuid = ?", configurationUUID).
+		Order("version_no ASC").
+		Find(&versions).Error; err != nil {
+		t.Fatalf("load versions: %v", err)
+	}
+	return versions
+}
+
+func renameWithRetry(service *LocalConfigurationService, uuid string, name string) error {
+	var lastErr error
+	for i := 0; i < 6; i++ {
+		_, err := service.RenameNoAuth(uuid, name)
+		if err == nil {
+			return nil
+		}
+		lastErr = err
+		if errors.Is(err, ErrVersionConflict) || strings.Contains(err.Error(), "database is locked") {
+			time.Sleep(10 * time.Millisecond)
+			continue
+		}
+		return err
+	}
+	return fmt.Errorf("rename retries exhausted: %w", lastErr)
+}
+
+func TestRollbackVersionSnapshotJSONMatchesV1(t *testing.T) {
+	service, local := newLocalConfigServiceForTest(t)
+
+	created, err := service.Create("tester", &CreateConfigRequest{
+		Name:        "initial",
+		Items:       models.ConfigItems{{LotName: "GPU_A", Quantity: 1, UnitPrice: 2000}},
+		ServerCount: 1,
+	})
+	if err != nil {
+		t.Fatalf("create config: %v", err)
+	}
+	if _, err := service.RenameNoAuth(created.UUID, "second"); err != nil {
+		t.Fatalf("rename: %v", err)
+	}
+	if _, err := service.RollbackToVersion(created.UUID, 1, "tester"); err != nil {
+		t.Fatalf("rollback: %v", err)
+	}
+
+	versions := loadVersions(t, local, created.UUID)
+	if len(versions) != 3 {
+		t.Fatalf("expected 3 versions")
+	}
+
+	var v1 map[string]any
+	var v3 map[string]any
+	if err := json.Unmarshal([]byte(versions[0].Data), &v1); err != nil {
+		t.Fatalf("unmarshal v1: %v", err)
+	}
+	if err := json.Unmarshal([]byte(versions[2].Data), &v3); err != nil {
+		t.Fatalf("unmarshal v3: %v", err)
+	}
+	if fmt.Sprintf("%v", v1["name"]) != fmt.Sprintf("%v", v3["name"]) {
+		t.Fatalf("rollback snapshot differs from v1 snapshot by name")
+	}
+}
+
+func TestDeleteMarksInactiveAndCreatesVersion(t *testing.T) {
+	service, local := newLocalConfigServiceForTest(t)
+
+	created, err := service.Create("tester", &CreateConfigRequest{
+		Name:        "to-archive",
+		Items:       models.ConfigItems{{LotName: "CPU_Z", Quantity: 1, UnitPrice: 500}},
+		ServerCount: 1,
+	})
+	if err != nil {
+		t.Fatalf("create config: %v", err)
+	}
+	if err := service.DeleteNoAuth(created.UUID); err != nil {
+		t.Fatalf("delete no auth: %v", err)
+	}
+
+	cfg, err := local.GetConfigurationByUUID(created.UUID)
+	if err != nil {
+		t.Fatalf("load archived config: %v", err)
+	}
+	if cfg.IsActive {
+		t.Fatalf("expected config to be inactive after delete")
+	}
+
+	versions := loadVersions(t, local, created.UUID)
+	if len(versions) != 2 {
+		t.Fatalf("expected 2 versions after archive, got %d", len(versions))
+	}
+	if versions[1].VersionNo != 2 {
+		t.Fatalf("expected archive to create version 2, got %d", versions[1].VersionNo)
+	}
+
+	list, total, err := service.ListAll(1, 20)
+	if err != nil {
+		t.Fatalf("list all: %v", err)
+	}
+	if total != int64(len(list)) {
+		t.Fatalf("unexpected total/list mismatch")
+	}
+	if len(list) != 0 {
+		t.Fatalf("expected archived config to be hidden from list")
+	}
+}
+
+func TestReactivateRestoresArchivedConfigurationAndCreatesVersion(t *testing.T) {
+	service, local := newLocalConfigServiceForTest(t)
+
+	created, err := service.Create("tester", &CreateConfigRequest{
+		Name:        "to-reactivate",
+		Items:       models.ConfigItems{{LotName: "CPU_R", Quantity: 1, UnitPrice: 700}},
+		ServerCount: 1,
+	})
+	if err != nil {
+		t.Fatalf("create config: %v", err)
+	}
+	if err := service.DeleteNoAuth(created.UUID); err != nil {
+		t.Fatalf("archive config: %v", err)
+	}
+	if _, err := service.ReactivateNoAuth(created.UUID); err != nil {
+		t.Fatalf("reactivate config: %v", err)
+	}
+
+	cfg, err := local.GetConfigurationByUUID(created.UUID)
+	if err != nil {
+		t.Fatalf("load reactivated config: %v", err)
+	}
+	if !cfg.IsActive {
+		t.Fatalf("expected config to be active after reactivation")
+	}
+
+	versions := loadVersions(t, local, created.UUID)
+	if len(versions) != 3 {
+		t.Fatalf("expected 3 versions after reactivation, got %d", len(versions))
+	}
+	if versions[2].VersionNo != 3 {
+		t.Fatalf("expected reactivation version 3, got %d", versions[2].VersionNo)
+	}
+
+	list, _, err := service.ListAll(1, 20)
+	if err != nil {
+		t.Fatalf("list all after reactivation: %v", err)
+	}
+	if len(list) != 1 {
+		t.Fatalf("expected reactivated config to be visible in list")
+	}
+}

internal/services/pricelist/service.go

@@ -1,187 +0,0 @@
-package pricelist
-
-import (
-	"fmt"
-	"log/slog"
-	"time"
-
-	"git.mchus.pro/mchus/quoteforge/internal/models"
-	"git.mchus.pro/mchus/quoteforge/internal/repository"
-	"gorm.io/gorm"
-)
-
-type Service struct {
-	repo          *repository.PricelistRepository
-	componentRepo *repository.ComponentRepository
-	db            *gorm.DB
-}
-
-func NewService(db *gorm.DB, repo *repository.PricelistRepository, componentRepo *repository.ComponentRepository) *Service {
-	return &Service{
-		repo:          repo,
-		componentRepo: componentRepo,
-		db:            db,
-	}
-}
-
-// CreateFromCurrentPrices creates a new pricelist by taking a snapshot of current prices
-func (s *Service) CreateFromCurrentPrices(createdBy string) (*models.Pricelist, error) {
-	if s.repo == nil || s.db == nil {
-		return nil, fmt.Errorf("offline mode: cannot create pricelists")
-	}
-
-	version, err := s.repo.GenerateVersion()
-	if err != nil {
-		return nil, fmt.Errorf("generating version: %w", err)
-	}
-
-	expiresAt := time.Now().AddDate(1, 0, 0) // +1 year
-
-	pricelist := &models.Pricelist{
-		Version:   version,
-		CreatedBy: createdBy,
-		IsActive:  true,
-		ExpiresAt: &expiresAt,
-	}
-
-	if err := s.repo.Create(pricelist); err != nil {
-		return nil, fmt.Errorf("creating pricelist: %w", err)
-	}
-
-	// Get all components with prices from qt_lot_metadata
-	var metadata []models.LotMetadata
-	if err := s.db.Where("current_price IS NOT NULL AND current_price > 0").Find(&metadata).Error; err != nil {
-		return nil, fmt.Errorf("getting lot metadata: %w", err)
-	}
-
-	// Create pricelist items with all price settings
-	items := make([]models.PricelistItem, 0, len(metadata))
-	for _, m := range metadata {
-		if m.CurrentPrice == nil || *m.CurrentPrice <= 0 {
-			continue
-		}
-		items = append(items, models.PricelistItem{
-			PricelistID:      pricelist.ID,
-			LotName:          m.LotName,
-			Price:            *m.CurrentPrice,
-			PriceMethod:      string(m.PriceMethod),
-			PricePeriodDays:  m.PricePeriodDays,
-			PriceCoefficient: m.PriceCoefficient,
-			ManualPrice:      m.ManualPrice,
-			MetaPrices:       m.MetaPrices,
-		})
-	}
-
-	if err := s.repo.CreateItems(items); err != nil {
-		// Clean up the pricelist if items creation fails
-		s.repo.Delete(pricelist.ID)
-		return nil, fmt.Errorf("creating pricelist items: %w", err)
-	}
-
-	pricelist.ItemCount = len(items)
-
-	slog.Info("pricelist created",
-		"id", pricelist.ID,
-		"version", pricelist.Version,
-		"items", len(items),
-		"created_by", createdBy,
-	)
-
-	return pricelist, nil
-}
-
-// List returns pricelists with pagination
-func (s *Service) List(page, perPage int) ([]models.PricelistSummary, int64, error) {
-	// If no database connection (offline mode), return empty list
-	if s.repo == nil {
-		return []models.PricelistSummary{}, 0, nil
-	}
-
-	if page < 1 {
-		page = 1
-	}
-	if perPage < 1 {
-		perPage = 20
-	}
-	offset := (page - 1) * perPage
-	return s.repo.List(offset, perPage)
-}
-
-// GetByID returns a pricelist by ID
-func (s *Service) GetByID(id uint) (*models.Pricelist, error) {
-	if s.repo == nil {
-		return nil, fmt.Errorf("offline mode: pricelist service not available")
-	}
-	return s.repo.GetByID(id)
-}
-
-// GetItems returns pricelist items with pagination
-func (s *Service) GetItems(pricelistID uint, page, perPage int, search string) ([]models.PricelistItem, int64, error) {
-	if s.repo == nil {
-		return []models.PricelistItem{}, 0, nil
-	}
-	if page < 1 {
-		page = 1
-	}
-	if perPage < 1 {
-		perPage = 50
-	}
-	offset := (page - 1) * perPage
-	return s.repo.GetItems(pricelistID, offset, perPage, search)
-}
-
-// Delete deletes a pricelist by ID
-func (s *Service) Delete(id uint) error {
-	if s.repo == nil {
-		return fmt.Errorf("offline mode: cannot delete pricelists")
-	}
-	return s.repo.Delete(id)
-}
-
-// CanWrite returns true if the user can create pricelists
-func (s *Service) CanWrite() bool {
-	if s.repo == nil {
-		return false
-	}
-	return s.repo.CanWrite()
-}
-
-// CanWriteDebug returns write permission status with debug info
-func (s *Service) CanWriteDebug() (bool, string) {
-	if s.repo == nil {
-		return false, "offline mode"
-	}
-	return s.repo.CanWriteDebug()
-}
-
-// GetLatestActive returns the most recent active pricelist
-func (s *Service) GetLatestActive() (*models.Pricelist, error) {
-	if s.repo == nil {
-		return nil, fmt.Errorf("offline mode: pricelist service not available")
-	}
-	return s.repo.GetLatestActive()
-}
-
-// CleanupExpired deletes expired and unused pricelists
-func (s *Service) CleanupExpired() (int, error) {
-	if s.repo == nil {
-		return 0, fmt.Errorf("offline mode: cleanup not available")
-	}
-
-	expired, err := s.repo.GetExpiredUnused()
-	if err != nil {
-		return 0, err
-	}
-
-	deleted := 0
-	for _, pl := range expired {
-		if err := s.repo.Delete(pl.ID); err != nil {
-			slog.Warn("failed to delete expired pricelist", "id", pl.ID, "error", err)
-			continue
-		}
-		deleted++
-	}
-
-	slog.Info("cleaned up expired pricelists", "deleted", deleted)
-	return deleted, nil
-}

internal/services/pricing/calculator.go

@@ -1,121 +0,0 @@
-package pricing
-
-import (
-	"math"
-	"sort"
-	"time"
-
-	"git.mchus.pro/mchus/quoteforge/internal/repository"
-)
-
-// CalculateMedian returns the median of prices
-func CalculateMedian(prices []float64) float64 {
-	if len(prices) == 0 {
-		return 0
-	}
-
-	sorted := make([]float64, len(prices))
-	copy(sorted, prices)
-	sort.Float64s(sorted)
-
-	n := len(sorted)
-	if n%2 == 0 {
-		return (sorted[n/2-1] + sorted[n/2]) / 2
-	}
-	return sorted[n/2]
-}
-
-// CalculateAverage returns the arithmetic mean of prices
-func CalculateAverage(prices []float64) float64 {
-	if len(prices) == 0 {
-		return 0
-	}
-
-	var sum float64
-	for _, p := range prices {
-		sum += p
-	}
-	return sum / float64(len(prices))
-}
-
-// CalculateWeightedMedian calculates median with exponential decay weights
-// More recent prices have higher weight
-func CalculateWeightedMedian(points []repository.PricePoint, decayDays int) float64 {
-	if len(points) == 0 {
-		return 0
-	}
-
-	type weightedPrice struct {
-		price  float64
-		weight float64
-	}
-
-	now := time.Now()
-	weighted := make([]weightedPrice, len(points))
-	var totalWeight float64
-
-	for i, p := range points {
-		daysSince := now.Sub(p.Date).Hours() / 24
-		// weight = e^(-days / decay_days)
-		weight := math.Exp(-daysSince / float64(decayDays))
-		weighted[i] = weightedPrice{price: p.Price, weight: weight}
-		totalWeight += weight
-	}
-
-	// Sort by price
-	sort.Slice(weighted, func(i, j int) bool {
-		return weighted[i].price < weighted[j].price
-	})
-
-	// Find weighted median
-	targetWeight := totalWeight / 2
-	var cumulativeWeight float64
-
-	for _, wp := range weighted {
-		cumulativeWeight += wp.weight
-		if cumulativeWeight >= targetWeight {
-			return wp.price
-		}
-	}
-
-	return weighted[len(weighted)-1].price
-}
-
-// CalculatePercentile calculates the nth percentile of prices
-func CalculatePercentile(prices []float64, percentile float64) float64 {
-	if len(prices) == 0 {
-		return 0
-	}
-
-	sorted := make([]float64, len(prices))
-	copy(sorted, prices)
-	sort.Float64s(sorted)
-
-	index := (percentile / 100) * float64(len(sorted)-1)
-	lower := int(math.Floor(index))
-	upper := int(math.Ceil(index))
-
-	if lower == upper {
-		return sorted[lower]
-	}
-
-	fraction := index - float64(lower)
-	return sorted[lower]*(1-fraction) + sorted[upper]*fraction
-}
-
-// CalculateStdDev calculates standard deviation
-func CalculateStdDev(prices []float64) float64 {
-	if len(prices) < 2 {
-		return 0
-	}
-
-	mean := CalculateAverage(prices)
-	var sumSquares float64
-
-	for _, p := range prices {
-		diff := p - mean
-		sumSquares += diff * diff
-	}
-
-	return math.Sqrt(sumSquares / float64(len(prices)-1))
-}

internal/services/pricing/service.go

@@ -1,205 +0,0 @@
-package pricing
-
-import (
-	"time"
-
-	"git.mchus.pro/mchus/quoteforge/internal/config"
-	"git.mchus.pro/mchus/quoteforge/internal/models"
-	"git.mchus.pro/mchus/quoteforge/internal/repository"
-)
-
-type Service struct {
-	componentRepo *repository.ComponentRepository
-	priceRepo     *repository.PriceRepository
-	config        config.PricingConfig
-}
-
-func NewService(
-	componentRepo *repository.ComponentRepository,
-	priceRepo *repository.PriceRepository,
-	cfg config.PricingConfig,
-) *Service {
-	return &Service{
-		componentRepo: componentRepo,
-		priceRepo:     priceRepo,
-		config:        cfg,
-	}
-}
-
-// GetEffectivePrice returns the current effective price for a component
-// Priority: active override > calculated price > nil
-func (s *Service) GetEffectivePrice(lotName string) (*float64, error) {
-	// Check for active override first
-	override, err := s.priceRepo.GetPriceOverride(lotName)
-	if err == nil && override != nil {
-		return &override.Price, nil
-	}
-
-	// Get component metadata
-	component, err := s.componentRepo.GetByLotName(lotName)
-	if err != nil {
-		return nil, err
-	}
-
-	return component.CurrentPrice, nil
-}
-
-// CalculatePrice calculates price using the specified method
-func (s *Service) CalculatePrice(lotName string, method models.PriceMethod, periodDays int) (float64, error) {
-	if periodDays == 0 {
-		periodDays = s.config.DefaultPeriodDays
-	}
-
-	points, err := s.priceRepo.GetPriceHistory(lotName, periodDays)
-	if err != nil {
-		return 0, err
-	}
-
-	if len(points) == 0 {
-		return 0, nil
-	}
-
-	prices := make([]float64, len(points))
-	for i, p := range points {
-		prices[i] = p.Price
-	}
-
-	switch method {
-	case models.PriceMethodAverage:
-		return CalculateAverage(prices), nil
-	case models.PriceMethodWeightedMedian:
-		return CalculateWeightedMedian(points, periodDays), nil
-	case models.PriceMethodMedian:
-		fallthrough
-	default:
-		return CalculateMedian(prices), nil
-	}
-}
-
-// UpdateComponentPrice recalculates and updates the price for a component
-func (s *Service) UpdateComponentPrice(lotName string) error {
-	component, err := s.componentRepo.GetByLotName(lotName)
-	if err != nil {
-		return err
-	}
-
-	price, err := s.CalculatePrice(lotName, component.PriceMethod, component.PricePeriodDays)
-	if err != nil {
-		return err
-	}
-
-	now := time.Now()
-	if price > 0 {
-		component.CurrentPrice = &price
-		component.PriceUpdatedAt = &now
-	}
-
-	return s.componentRepo.Update(component)
-}
-
-// SetManualPrice sets a manual price override
-func (s *Service) SetManualPrice(lotName string, price float64, reason string, userID uint) error {
-	override := &models.PriceOverride{
-		LotName:   lotName,
-		Price:     price,
-		ValidFrom: time.Now(),
-		Reason:    reason,
-		CreatedBy: userID,
-	}
-	return s.priceRepo.CreatePriceOverride(override)
-}
-
-// UpdatePriceMethod changes the pricing method for a component
-func (s *Service) UpdatePriceMethod(lotName string, method models.PriceMethod, periodDays int) error {
-	component, err := s.componentRepo.GetByLotName(lotName)
-	if err != nil {
-		return err
-	}
-
-	component.PriceMethod = method
-	if periodDays > 0 {
-		component.PricePeriodDays = periodDays
-	}
-
-	if err := s.componentRepo.Update(component); err != nil {
-		return err
-	}
-
-	return s.UpdateComponentPrice(lotName)
-}
-
-// GetPriceStats returns statistics for a component's price history
-func (s *Service) GetPriceStats(lotName string, periodDays int) (*PriceStats, error) {
-	if periodDays == 0 {
-		periodDays = s.config.DefaultPeriodDays
-	}
-
-	points, err := s.priceRepo.GetPriceHistory(lotName, periodDays)
-	if err != nil {
-		return nil, err
-	}
-
-	if len(points) == 0 {
-		return &PriceStats{QuoteCount: 0}, nil
-	}
-
-	prices := make([]float64, len(points))
-	for i, p := range points {
-		prices[i] = p.Price
-	}
-
-	return &PriceStats{
-		QuoteCount:   len(points),
-		MinPrice:     CalculatePercentile(prices, 0),
-		MaxPrice:     CalculatePercentile(prices, 100),
-		MedianPrice:  CalculateMedian(prices),
-		AveragePrice: CalculateAverage(prices),
-		StdDeviation: CalculateStdDev(prices),
-		LatestPrice:  points[0].Price,
-		LatestDate:   points[0].Date,
-		OldestDate:   points[len(points)-1].Date,
-		Percentile25: CalculatePercentile(prices, 25),
-		Percentile75: CalculatePercentile(prices, 75),
-	}, nil
-}
-
-type PriceStats struct {
-	QuoteCount   int       `json:"quote_count"`
-	MinPrice     float64   `json:"min_price"`
-	MaxPrice     float64   `json:"max_price"`
-	MedianPrice  float64   `json:"median_price"`
-	AveragePrice float64   `json:"average_price"`
-	StdDeviation float64   `json:"std_deviation"`
-	LatestPrice  float64   `json:"latest_price"`
-	LatestDate   time.Time `json:"latest_date"`
-	OldestDate   time.Time `json:"oldest_date"`
-	Percentile25 float64   `json:"percentile_25"`
-	Percentile75 float64   `json:"percentile_75"`
-}
-
-// RecalculateAllPrices recalculates prices for all components
-func (s *Service) RecalculateAllPrices() (updated int, errors int) {
-	// Get all components
-	filter := repository.ComponentFilter{}
-	offset := 0
-	limit := 100
-
-	for {
-		components, _, err := s.componentRepo.List(filter, offset, limit)
-		if err != nil || len(components) == 0 {
-			break
-		}
-
-		for _, comp := range components {
-			if err := s.UpdateComponentPrice(comp.LotName); err != nil {
-				errors++
-			} else {
-				updated++
-			}
-		}
-
-		offset += limit
-	}
-
-	return updated, errors
-}

internal/services/project.go

@@ -0,0 +1,319 @@
+package services
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/url"
+	"strings"
+	"time"
+
+	"git.mchus.pro/mchus/quoteforge/internal/localdb"
+	"git.mchus.pro/mchus/quoteforge/internal/models"
+	"git.mchus.pro/mchus/quoteforge/internal/services/sync"
+	"github.com/google/uuid"
+	"gorm.io/gorm"
+)
+
+var (
+	ErrProjectNotFound  = errors.New("project not found")
+	ErrProjectForbidden = errors.New("access to project forbidden")
+)
+
+type ProjectService struct {
+	localDB *localdb.LocalDB
+}
+
+func NewProjectService(localDB *localdb.LocalDB) *ProjectService {
+	return &ProjectService{localDB: localDB}
+}
+
+type CreateProjectRequest struct {
+	Name       string `json:"name"`
+	TrackerURL string `json:"tracker_url"`
+}
+
+type UpdateProjectRequest struct {
+	Name       string  `json:"name"`
+	TrackerURL *string `json:"tracker_url,omitempty"`
+}
+
+type ProjectConfigurationsResult struct {
+	ProjectUUID string                 `json:"project_uuid"`
+	Configs     []models.Configuration `json:"configurations"`
+	Total       float64                `json:"total"`
+}
+
+func (s *ProjectService) Create(ownerUsername string, req *CreateProjectRequest) (*models.Project, error) {
+	name := strings.TrimSpace(req.Name)
+	if name == "" {
+		return nil, fmt.Errorf("project name is required")
+	}
+
+	now := time.Now()
+	localProject := &localdb.LocalProject{
+		UUID:          uuid.NewString(),
+		OwnerUsername: ownerUsername,
+		Name:          name,
+		TrackerURL:    normalizeProjectTrackerURL(name, req.TrackerURL),
+		IsActive:      true,
+		IsSystem:      false,
+		CreatedAt:     now,
+		UpdatedAt:     now,
+		SyncStatus:    "pending",
+	}
+	if err := s.localDB.SaveProject(localProject); err != nil {
+		return nil, err
+	}
+	if err := s.enqueueProjectPendingChange(localProject, "create"); err != nil {
+		return nil, err
+	}
+	return localdb.LocalToProject(localProject), nil
+}
+
+func (s *ProjectService) Update(projectUUID, ownerUsername string, req *UpdateProjectRequest) (*models.Project, error) {
+	localProject, err := s.localDB.GetProjectByUUID(projectUUID)
+	if err != nil {
+		return nil, ErrProjectNotFound
+	}
+	if localProject.OwnerUsername != ownerUsername {
+		return nil, ErrProjectForbidden
+	}
+
+	name := strings.TrimSpace(req.Name)
+	if name == "" {
+		return nil, fmt.Errorf("project name is required")
+	}
+
+	localProject.Name = name
+	if req.TrackerURL != nil {
+		localProject.TrackerURL = normalizeProjectTrackerURL(name, *req.TrackerURL)
+	} else if strings.TrimSpace(localProject.TrackerURL) == "" {
+		localProject.TrackerURL = normalizeProjectTrackerURL(name, "")
+	}
+	localProject.UpdatedAt = time.Now()
+	localProject.SyncStatus = "pending"
+	if err := s.localDB.SaveProject(localProject); err != nil {
+		return nil, err
+	}
+	if err := s.enqueueProjectPendingChange(localProject, "update"); err != nil {
+		return nil, err
+	}
+	return localdb.LocalToProject(localProject), nil
+}
+
+func (s *ProjectService) Archive(projectUUID, ownerUsername string) error {
+	return s.setProjectActive(projectUUID, ownerUsername, false)
+}
+
+func (s *ProjectService) Reactivate(projectUUID, ownerUsername string) error {
+	return s.setProjectActive(projectUUID, ownerUsername, true)
+}
+
+func (s *ProjectService) setProjectActive(projectUUID, ownerUsername string, isActive bool) error {
+	return s.localDB.DB().Transaction(func(tx *gorm.DB) error {
+		var project localdb.LocalProject
+		if err := tx.Where("uuid = ?", projectUUID).First(&project).Error; err != nil {
+			return ErrProjectNotFound
+		}
+		if project.OwnerUsername != ownerUsername {
+			return ErrProjectForbidden
+		}
+		if project.IsActive == isActive {
+			return nil
+		}
+
+		project.IsActive = isActive
+		project.UpdatedAt = time.Now()
+		project.SyncStatus = "pending"
+		if err := tx.Save(&project).Error; err != nil {
+			return err
+		}
+
+		if err := s.enqueueProjectPendingChangeTx(tx, &project, boolToOp(isActive, "reactivate", "archive")); err != nil {
+			return err
+		}
+
+		var configs []localdb.LocalConfiguration
+		if err := tx.Where("project_uuid = ?", projectUUID).Find(&configs).Error; err != nil {
+			return err
+		}
+		for i := range configs {
+			cfg := configs[i]
+			cfg.IsActive = isActive
+			cfg.SyncStatus = "pending"
+			cfg.UpdatedAt = time.Now()
+			if err := tx.Save(&cfg).Error; err != nil {
+				return err
+			}
+
+			modelCfg := localdb.LocalToConfiguration(&cfg)
+			payload, err := json.Marshal(modelCfg)
+			if err != nil {
+				return err
+			}
+			change := &localdb.PendingChange{
+				EntityType: "configuration",
+				EntityUUID: cfg.UUID,
+				Operation:  "update",
+				Payload:    string(payload),
+				CreatedAt:  time.Now(),
+				Attempts:   0,
+			}
+			if err := tx.Create(change).Error; err != nil {
+				return err
+			}
+		}
+
+		return nil
+	})
+}
+
+func (s *ProjectService) ListByUser(ownerUsername string, includeArchived bool) ([]models.Project, error) {
+	localProjects, err := s.localDB.GetAllProjects(includeArchived)
+	if err != nil {
+		return nil, err
+	}
+
+	projects := make([]models.Project, 0, len(localProjects))
+	for i := range localProjects {
+		projects = append(projects, *localdb.LocalToProject(&localProjects[i]))
+	}
+	return projects, nil
+}
+
+func (s *ProjectService) GetByUUID(projectUUID, ownerUsername string) (*models.Project, error) {
+	localProject, err := s.localDB.GetProjectByUUID(projectUUID)
+	if err != nil {
+		return nil, ErrProjectNotFound
+	}
+	return localdb.LocalToProject(localProject), nil
+}
+
+func (s *ProjectService) ListConfigurations(projectUUID, ownerUsername, status string) (*ProjectConfigurationsResult, error) {
+	project, err := s.GetByUUID(projectUUID, ownerUsername)
+	if err != nil {
+		return nil, err
+	}
+	if !project.IsActive && status == "active" {
+		return &ProjectConfigurationsResult{
+			ProjectUUID: projectUUID,
+			Configs:     []models.Configuration{},
+			Total:       0,
+		}, nil
+	}
+
+	localConfigs, err := s.localDB.GetConfigurations()
+	if err != nil {
+		return nil, err
+	}
+
+	configs := make([]models.Configuration, 0, len(localConfigs))
+	total := 0.0
+	for i := range localConfigs {
+		localCfg := localConfigs[i]
+		if localCfg.ProjectUUID == nil || *localCfg.ProjectUUID != projectUUID {
+			continue
+		}
+		switch status {
+		case "active", "":
+			if !localCfg.IsActive {
+				continue
+			}
+		case "archived":
+			if localCfg.IsActive {
+				continue
+			}
+		case "all":
+		default:
+			if !localCfg.IsActive {
+				continue
+			}
+		}
+
+		cfg := localdb.LocalToConfiguration(&localCfg)
+		if cfg.TotalPrice != nil {
+			total += *cfg.TotalPrice
+		}
+		configs = append(configs, *cfg)
+	}
+
+	return &ProjectConfigurationsResult{
+		ProjectUUID: projectUUID,
+		Configs:     configs,
+		Total:       total,
+	}, nil
+}
+
+func (s *ProjectService) ResolveProjectUUID(ownerUsername string, projectUUID *string) (*string, error) {
+	if projectUUID == nil || strings.TrimSpace(*projectUUID) == "" {
+		project, err := s.localDB.EnsureDefaultProject(ownerUsername)
+		if err != nil {
+			return nil, err
+		}
+		return &project.UUID, nil
+	}
+
+	project, err := s.localDB.GetProjectByUUID(strings.TrimSpace(*projectUUID))
+	if err != nil {
+		return nil, ErrProjectNotFound
+	}
+	if project.OwnerUsername != ownerUsername {
+		return nil, ErrProjectForbidden
+	}
+	if !project.IsActive {
+		return nil, fmt.Errorf("project is archived")
+	}
+
+	resolved := project.UUID
+	return &resolved, nil
+}
+
+func normalizeProjectTrackerURL(projectCode, trackerURL string) string {
+	trimmedURL := strings.TrimSpace(trackerURL)
+	if trimmedURL != "" {
+		return trimmedURL
+	}
+
+	trimmedCode := strings.TrimSpace(projectCode)
+	if trimmedCode == "" {
+		return ""
+	}
+
+	return "https://tracker.yandex.ru/" + url.PathEscape(trimmedCode)
+}
+
+func (s *ProjectService) enqueueProjectPendingChange(project *localdb.LocalProject, operation string) error {
+	return s.enqueueProjectPendingChangeTx(s.localDB.DB(), project, operation)
+}
+
+func (s *ProjectService) enqueueProjectPendingChangeTx(tx *gorm.DB, project *localdb.LocalProject, operation string) error {
+	payload := sync.ProjectChangePayload{
+		EventID:        uuid.NewString(),
+		ProjectUUID:    project.UUID,
+		Operation:      operation,
+		Snapshot:       *localdb.LocalToProject(project),
+		CreatedAt:      time.Now().UTC(),
+		IdempotencyKey: fmt.Sprintf("%s:%d:%s", project.UUID, project.UpdatedAt.UnixNano(), operation),
+	}
+	raw, err := json.Marshal(payload)
+	if err != nil {
+		return err
+	}
+	change := &localdb.PendingChange{
+		EntityType: "project",
+		EntityUUID: project.UUID,
+		Operation:  operation,
+		Payload:    string(raw),
+		CreatedAt:  time.Now(),
+		Attempts:   0,
+	}
+	return tx.Create(change).Error
+}
+
+func boolToOp(v bool, whenTrue, whenFalse string) string {
+	if v {
+		return whenTrue
+	}
+	return whenFalse
+}

internal/services/quote.go

@@ -2,10 +2,13 @@ package services
 
 import (
 	"errors"
+	"fmt"
+	"sync"
+	"time"
 
+	"git.mchus.pro/mchus/quoteforge/internal/localdb"
 	"git.mchus.pro/mchus/quoteforge/internal/models"
 	"git.mchus.pro/mchus/quoteforge/internal/repository"
-	"git.mchus.pro/mchus/quoteforge/internal/services/pricing"
 )
 
 var (
@@ -17,21 +20,41 @@ var (
 type QuoteService struct {
 	componentRepo  *repository.ComponentRepository
 	statsRepo      *repository.StatsRepository
-	pricingService *pricing.Service
+	pricelistRepo  *repository.PricelistRepository
+	localDB        *localdb.LocalDB
+	pricingService priceResolver
+	cacheMu        sync.RWMutex
+	priceCache     map[string]cachedLotPrice
+	cacheTTL       time.Duration
+}
+
+type priceResolver interface {
+	GetEffectivePrice(lotName string) (*float64, error)
 }
 
 func NewQuoteService(
 	componentRepo *repository.ComponentRepository,
 	statsRepo *repository.StatsRepository,
-	pricingService *pricing.Service,
+	pricelistRepo *repository.PricelistRepository,
+	localDB *localdb.LocalDB,
+	pricingService priceResolver,
 ) *QuoteService {
 	return &QuoteService{
 		componentRepo:  componentRepo,
 		statsRepo:      statsRepo,
+		pricelistRepo:  pricelistRepo,
+		localDB:        localDB,
 		pricingService: pricingService,
+		priceCache:     make(map[string]cachedLotPrice, 4096),
+		cacheTTL:       10 * time.Second,
 	}
 }
 
+type cachedLotPrice struct {
+	price     *float64
+	expiresAt time.Time
+}
+
 type QuoteItem struct {
 	LotName     string  `json:"lot_name"`
 	Quantity    int     `json:"quantity"`
@@ -55,14 +78,105 @@ type QuoteRequest struct {
 		LotName  string `json:"lot_name"`
 		Quantity int    `json:"quantity"`
 	} `json:"items"`
+	PricelistID *uint `json:"pricelist_id,omitempty"` // Optional: use specific pricelist for pricing
+}
+
+type PriceLevelsRequest struct {
+	Items []struct {
+		LotName  string `json:"lot_name"`
+		Quantity int    `json:"quantity"`
+	} `json:"items"`
+	PricelistIDs map[string]uint `json:"pricelist_ids,omitempty"`
+	NoCache      bool            `json:"no_cache,omitempty"`
+}
+
+type PriceLevelsItem struct {
+	LotName              string   `json:"lot_name"`
+	Quantity             int      `json:"quantity"`
+	EstimatePrice        *float64 `json:"estimate_price"`
+	WarehousePrice       *float64 `json:"warehouse_price"`
+	CompetitorPrice      *float64 `json:"competitor_price"`
+	DeltaWhEstimateAbs   *float64 `json:"delta_wh_estimate_abs"`
+	DeltaWhEstimatePct   *float64 `json:"delta_wh_estimate_pct"`
+	DeltaCompEstimateAbs *float64 `json:"delta_comp_estimate_abs"`
+	DeltaCompEstimatePct *float64 `json:"delta_comp_estimate_pct"`
+	DeltaCompWhAbs       *float64 `json:"delta_comp_wh_abs"`
+	DeltaCompWhPct       *float64 `json:"delta_comp_wh_pct"`
+	PriceMissing         []string `json:"price_missing"`
+}
+
+type PriceLevelsResult struct {
+	Items                []PriceLevelsItem `json:"items"`
+	ResolvedPricelistIDs map[string]uint   `json:"resolved_pricelist_ids"`
 }
 
 func (s *QuoteService) ValidateAndCalculate(req *QuoteRequest) (*QuoteValidationResult, error) {
 	if len(req.Items) == 0 {
 		return nil, ErrEmptyQuote
 	}
+
+	// Strict local-first path: calculations use local SQLite snapshot regardless of online status.
+	if s.localDB != nil {
+		result := &QuoteValidationResult{
+			Valid:    true,
+			Items:    make([]QuoteItem, 0, len(req.Items)),
+			Errors:   make([]string, 0),
+			Warnings: make([]string, 0),
+		}
+
+		// Determine which pricelist to use for pricing
+		pricelistID := req.PricelistID
+		if pricelistID == nil || *pricelistID == 0 {
+			// By default, use latest estimate pricelist
+			latestPricelist, err := s.localDB.GetLatestLocalPricelistBySource("estimate")
+			if err == nil && latestPricelist != nil {
+				pricelistID = &latestPricelist.ServerID
+			}
+		}
+
+		var total float64
+		for _, reqItem := range req.Items {
+			localComp, err := s.localDB.GetLocalComponent(reqItem.LotName)
+			if err != nil {
+				result.Valid = false
+				result.Errors = append(result.Errors, "Component not found: "+reqItem.LotName)
+				continue
+			}
+
+			item := QuoteItem{
+				LotName:     reqItem.LotName,
+				Quantity:    reqItem.Quantity,
+				Description: localComp.LotDescription,
+				Category:    localComp.Category,
+				HasPrice:    false,
+				UnitPrice:   0,
+				TotalPrice:  0,
+			}
+
+			// Get price from pricelist_items
+			if pricelistID != nil {
+				price, found := s.lookupPriceByPricelistID(*pricelistID, reqItem.LotName)
+				if found && price > 0 {
+					item.UnitPrice = price
+					item.TotalPrice = price * float64(reqItem.Quantity)
+					item.HasPrice = true
+					total += item.TotalPrice
+				} else {
+					result.Warnings = append(result.Warnings, "No price available for: "+reqItem.LotName)
+				}
+			} else {
+				result.Warnings = append(result.Warnings, "No pricelist available for: "+reqItem.LotName)
+			}
+
+			result.Items = append(result.Items, item)
+		}
+
+		result.Total = total
+		return result, nil
+	}
+
 	if s.componentRepo == nil || s.pricingService == nil {
-		return nil, errors.New("offline mode: quote calculation not available")
+		return nil, errors.New("quote calculation not available")
 	}
 
 	result := &QuoteValidationResult{
@@ -130,8 +244,265 @@ func (s *QuoteService) ValidateAndCalculate(req *QuoteRequest) (*QuoteValidation
 	return result, nil
 }
 
+func (s *QuoteService) CalculatePriceLevels(req *PriceLevelsRequest) (*PriceLevelsResult, error) {
+	if len(req.Items) == 0 {
+		return nil, ErrEmptyQuote
+	}
+
+	lotNames := make([]string, 0, len(req.Items))
+	seenLots := make(map[string]struct{}, len(req.Items))
+	for _, reqItem := range req.Items {
+		if _, ok := seenLots[reqItem.LotName]; ok {
+			continue
+		}
+		seenLots[reqItem.LotName] = struct{}{}
+		lotNames = append(lotNames, reqItem.LotName)
+	}
+
+	result := &PriceLevelsResult{
+		Items:                make([]PriceLevelsItem, 0, len(req.Items)),
+		ResolvedPricelistIDs: map[string]uint{},
+	}
+
+	type levelState struct {
+		id     uint
+		prices map[string]float64
+	}
+	levelBySource := map[models.PricelistSource]*levelState{
+		models.PricelistSourceEstimate:   {prices: map[string]float64{}},
+		models.PricelistSourceWarehouse:  {prices: map[string]float64{}},
+		models.PricelistSourceCompetitor: {prices: map[string]float64{}},
+	}
+
+	for source, st := range levelBySource {
+		sourceKey := string(source)
+		if req.PricelistIDs != nil {
+			if explicitID, ok := req.PricelistIDs[sourceKey]; ok && explicitID > 0 {
+				st.id = explicitID
+				result.ResolvedPricelistIDs[sourceKey] = explicitID
+			}
+		}
+		if st.id == 0 && s.pricelistRepo != nil {
+			latest, err := s.pricelistRepo.GetLatestActiveBySource(sourceKey)
+			if err == nil {
+				st.id = latest.ID
+				result.ResolvedPricelistIDs[sourceKey] = latest.ID
+			}
+		}
+		if st.id == 0 {
+			continue
+		}
+		prices, err := s.lookupPricesByPricelistID(st.id, lotNames, req.NoCache)
+		if err == nil {
+			st.prices = prices
+		}
+	}
+
+	for _, reqItem := range req.Items {
+		item := PriceLevelsItem{
+			LotName:      reqItem.LotName,
+			Quantity:     reqItem.Quantity,
+			PriceMissing: make([]string, 0, 3),
+		}
+
+		if p, ok := levelBySource[models.PricelistSourceEstimate].prices[reqItem.LotName]; ok && p > 0 {
+			price := p
+			item.EstimatePrice = &price
+		}
+		if p, ok := levelBySource[models.PricelistSourceWarehouse].prices[reqItem.LotName]; ok && p > 0 {
+			price := p
+			item.WarehousePrice = &price
+		}
+		if p, ok := levelBySource[models.PricelistSourceCompetitor].prices[reqItem.LotName]; ok && p > 0 {
+			price := p
+			item.CompetitorPrice = &price
+		}
+
+		if item.EstimatePrice == nil {
+			item.PriceMissing = append(item.PriceMissing, string(models.PricelistSourceEstimate))
+		}
+		if item.WarehousePrice == nil {
+			item.PriceMissing = append(item.PriceMissing, string(models.PricelistSourceWarehouse))
+		}
+		if item.CompetitorPrice == nil {
+			item.PriceMissing = append(item.PriceMissing, string(models.PricelistSourceCompetitor))
+		}
+
+		item.DeltaWhEstimateAbs, item.DeltaWhEstimatePct = calculateDelta(item.WarehousePrice, item.EstimatePrice)
+		item.DeltaCompEstimateAbs, item.DeltaCompEstimatePct = calculateDelta(item.CompetitorPrice, item.EstimatePrice)
+		item.DeltaCompWhAbs, item.DeltaCompWhPct = calculateDelta(item.CompetitorPrice, item.WarehousePrice)
+
+		result.Items = append(result.Items, item)
+	}
+
+	return result, nil
+}
+
+func (s *QuoteService) lookupPricesByPricelistID(pricelistID uint, lotNames []string, noCache bool) (map[string]float64, error) {
+	result := make(map[string]float64, len(lotNames))
+	if pricelistID == 0 || len(lotNames) == 0 {
+		return result, nil
+	}
+
+	missing := make([]string, 0, len(lotNames))
+	if noCache {
+		missing = append(missing, lotNames...)
+	} else {
+		now := time.Now()
+		s.cacheMu.RLock()
+		for _, lotName := range lotNames {
+			if entry, ok := s.priceCache[s.cacheKey(pricelistID, lotName)]; ok && entry.expiresAt.After(now) {
+				if entry.price != nil && *entry.price > 0 {
+					result[lotName] = *entry.price
+				}
+				continue
+			}
+			missing = append(missing, lotName)
+		}
+		s.cacheMu.RUnlock()
+	}
+
+	if len(missing) == 0 {
+		return result, nil
+	}
+
+	loaded := make(map[string]float64, len(missing))
+	if s.pricelistRepo != nil {
+		prices, err := s.pricelistRepo.GetPricesForLots(pricelistID, missing)
+		if err == nil {
+			for lotName, price := range prices {
+				if price > 0 {
+					result[lotName] = price
+					loaded[lotName] = price
+				}
+			}
+			s.updateCache(pricelistID, missing, loaded)
+			return result, nil
+		}
+	}
+
+	// Fallback path (usually offline): local per-lot lookup.
+	if s.localDB != nil {
+		for _, lotName := range missing {
+			price, found := s.lookupPriceByPricelistID(pricelistID, lotName)
+			if found && price > 0 {
+				result[lotName] = price
+				loaded[lotName] = price
+			}
+		}
+		s.updateCache(pricelistID, missing, loaded)
+		return result, nil
+	}
+
+	return result, fmt.Errorf("price lookup unavailable for pricelist %d", pricelistID)
+}
+
+func (s *QuoteService) updateCache(pricelistID uint, requested []string, loaded map[string]float64) {
+	if len(requested) == 0 {
+		return
+	}
+	expiresAt := time.Now().Add(s.cacheTTL)
+	s.cacheMu.Lock()
+	defer s.cacheMu.Unlock()
+
+	for _, lotName := range requested {
+		if price, ok := loaded[lotName]; ok && price > 0 {
+			priceCopy := price
+			s.priceCache[s.cacheKey(pricelistID, lotName)] = cachedLotPrice{
+				price:     &priceCopy,
+				expiresAt: expiresAt,
+			}
+			continue
+		}
+		s.priceCache[s.cacheKey(pricelistID, lotName)] = cachedLotPrice{
+			price:     nil,
+			expiresAt: expiresAt,
+		}
+	}
+}
+
+func (s *QuoteService) cacheKey(pricelistID uint, lotName string) string {
+	return fmt.Sprintf("%d|%s", pricelistID, lotName)
+}
+
+func calculateDelta(target, base *float64) (*float64, *float64) {
+	if target == nil || base == nil {
+		return nil, nil
+	}
+	abs := *target - *base
+	if *base == 0 {
+		return &abs, nil
+	}
+	pct := (abs / *base) * 100
+	return &abs, &pct
+}
+
+func (s *QuoteService) lookupLevelPrice(source models.PricelistSource, lotName string, pricelistIDs map[string]uint) (*float64, uint) {
+	sourceKey := string(source)
+	if id, ok := pricelistIDs[sourceKey]; ok && id > 0 {
+		price, found := s.lookupPriceByPricelistID(id, lotName)
+		if found {
+			return &price, id
+		}
+		return nil, id
+	}
+
+	if s.pricelistRepo != nil {
+		price, id, err := s.pricelistRepo.GetPriceForLotBySource(sourceKey, lotName)
+		if err == nil && price > 0 {
+			return &price, id
+		}
+
+		latest, latestErr := s.pricelistRepo.GetLatestActiveBySource(sourceKey)
+		if latestErr == nil {
+			return nil, latest.ID
+		}
+	}
+
+	if s.localDB != nil {
+		localPL, err := s.localDB.GetLatestLocalPricelistBySource(sourceKey)
+		if err != nil {
+			return nil, 0
+		}
+		price, err := s.localDB.GetLocalPriceForLot(localPL.ID, lotName)
+		if err != nil || price <= 0 {
+			return nil, localPL.ServerID
+		}
+		return &price, localPL.ServerID
+	}
+
+	return nil, 0
+}
+
+func (s *QuoteService) lookupPriceByPricelistID(pricelistID uint, lotName string) (float64, bool) {
+	if s.pricelistRepo != nil {
+		price, err := s.pricelistRepo.GetPriceForLot(pricelistID, lotName)
+		if err == nil && price > 0 {
+			return price, true
+		}
+	}
+
+	if s.localDB != nil {
+		localPL, err := s.localDB.GetLocalPricelistByServerID(pricelistID)
+		if err != nil {
+			return 0, false
+		}
+		price, err := s.localDB.GetLocalPriceForLot(localPL.ID, lotName)
+		if err == nil && price > 0 {
+			return price, true
+		}
+	}
+
+	return 0, false
+}
+
 // RecordUsage records that components were used in a quote
 func (s *QuoteService) RecordUsage(items []models.ConfigItem) error {
+	if s.statsRepo == nil {
+		// Offline mode: usage stats are unavailable and should not block config saves.
+		return nil
+	}
+
 	for _, item := range items {
 		revenue := item.UnitPrice * float64(item.Quantity)
 		if err := s.statsRepo.IncrementUsage(item.LotName, item.Quantity, revenue); err != nil {

internal/services/quote_price_levels_test.go

@@ -0,0 +1,124 @@
+package services
+
+import (
+	"testing"
+	"time"
+
+	"git.mchus.pro/mchus/quoteforge/internal/models"
+	"git.mchus.pro/mchus/quoteforge/internal/repository"
+	"github.com/glebarez/sqlite"
+	"gorm.io/gorm"
+)
+
+func TestCalculatePriceLevels_WithMissingLevel(t *testing.T) {
+	db := newPriceLevelsTestDB(t)
+	repo := repository.NewPricelistRepository(db)
+	service := NewQuoteService(nil, nil, repo, nil, nil)
+
+	estimate := seedPricelistWithItem(t, repo, "estimate", "CPU_X", 100)
+	_ = estimate
+	seedPricelistWithItem(t, repo, "warehouse", "CPU_X", 120)
+
+	result, err := service.CalculatePriceLevels(&PriceLevelsRequest{
+		Items: []struct {
+			LotName  string `json:"lot_name"`
+			Quantity int    `json:"quantity"`
+		}{
+			{LotName: "CPU_X", Quantity: 2},
+		},
+	})
+	if err != nil {
+		t.Fatalf("CalculatePriceLevels returned error: %v", err)
+	}
+	if len(result.Items) != 1 {
+		t.Fatalf("expected 1 item, got %d", len(result.Items))
+	}
+	item := result.Items[0]
+	if item.EstimatePrice == nil || *item.EstimatePrice != 100 {
+		t.Fatalf("expected estimate 100, got %#v", item.EstimatePrice)
+	}
+	if item.WarehousePrice == nil || *item.WarehousePrice != 120 {
+		t.Fatalf("expected warehouse 120, got %#v", item.WarehousePrice)
+	}
+	if item.CompetitorPrice != nil {
+		t.Fatalf("expected competitor nil, got %#v", item.CompetitorPrice)
+	}
+	if len(item.PriceMissing) != 1 || item.PriceMissing[0] != "competitor" {
+		t.Fatalf("expected price_missing [competitor], got %#v", item.PriceMissing)
+	}
+	if item.DeltaWhEstimateAbs == nil || *item.DeltaWhEstimateAbs != 20 {
+		t.Fatalf("expected delta abs 20, got %#v", item.DeltaWhEstimateAbs)
+	}
+	if item.DeltaWhEstimatePct == nil || *item.DeltaWhEstimatePct != 20 {
+		t.Fatalf("expected delta pct 20, got %#v", item.DeltaWhEstimatePct)
+	}
+}
+
+func TestCalculatePriceLevels_UsesExplicitPricelistIDs(t *testing.T) {
+	db := newPriceLevelsTestDB(t)
+	repo := repository.NewPricelistRepository(db)
+	service := NewQuoteService(nil, nil, repo, nil, nil)
+
+	olderEstimate := seedPricelistWithItem(t, repo, "estimate", "CPU_Y", 80)
+	seedPricelistWithItem(t, repo, "estimate", "CPU_Y", 90)
+
+	result, err := service.CalculatePriceLevels(&PriceLevelsRequest{
+		Items: []struct {
+			LotName  string `json:"lot_name"`
+			Quantity int    `json:"quantity"`
+		}{
+			{LotName: "CPU_Y", Quantity: 1},
+		},
+		PricelistIDs: map[string]uint{
+			"estimate": olderEstimate.ID,
+		},
+	})
+	if err != nil {
+		t.Fatalf("CalculatePriceLevels returned error: %v", err)
+	}
+	item := result.Items[0]
+	if item.EstimatePrice == nil || *item.EstimatePrice != 80 {
+		t.Fatalf("expected explicit estimate 80, got %#v", item.EstimatePrice)
+	}
+}
+
+func newPriceLevelsTestDB(t *testing.T) *gorm.DB {
+	t.Helper()
+	db, err := gorm.Open(sqlite.Open("file::memory:?cache=shared"), &gorm.Config{})
+	if err != nil {
+		t.Fatalf("open sqlite: %v", err)
+	}
+	if err := db.AutoMigrate(&models.Pricelist{}, &models.PricelistItem{}); err != nil {
+		t.Fatalf("migrate: %v", err)
+	}
+	return db
+}
+
+func seedPricelistWithItem(t *testing.T, repo *repository.PricelistRepository, source, lot string, price float64) *models.Pricelist {
+	t.Helper()
+	version, err := repo.GenerateVersionBySource(source)
+	if err != nil {
+		t.Fatalf("GenerateVersionBySource: %v", err)
+	}
+	expiresAt := time.Now().Add(24 * time.Hour)
+	pl := &models.Pricelist{
+		Source:    source,
+		Version:   version,
+		CreatedBy: "test",
+		IsActive:  true,
+		ExpiresAt: &expiresAt,
+	}
+	if err := repo.Create(pl); err != nil {
+		t.Fatalf("create pricelist: %v", err)
+	}
+	if err := repo.CreateItems([]models.PricelistItem{
+		{
+			PricelistID: pl.ID,
+			LotName:     lot,
+			Price:       price,
+		},
+	}); err != nil {
+		t.Fatalf("create items: %v", err)
+	}
+	return pl
+}

internal/services/sync/readiness.go

@@ -0,0 +1,410 @@
+package sync
+
+import (
+	"bufio"
+	"crypto/sha256"
+	"encoding/hex"
+	"errors"
+	"fmt"
+	"log/slog"
+	"strconv"
+	"strings"
+	"time"
+
+	"git.mchus.pro/mchus/quoteforge/internal/appmeta"
+	"git.mchus.pro/mchus/quoteforge/internal/localdb"
+	"gorm.io/gorm"
+)
+
+const (
+	ReadinessReady   = "ready"
+	ReadinessBlocked = "blocked"
+	ReadinessUnknown = "unknown"
+)
+
+var ErrSyncBlockedByReadiness = errors.New("sync blocked by readiness guard")
+
+type SyncReadiness struct {
+	Status                string     `json:"status"`
+	Blocked               bool       `json:"blocked"`
+	ReasonCode            string     `json:"reason_code,omitempty"`
+	ReasonText            string     `json:"reason_text,omitempty"`
+	RequiredMinAppVersion *string    `json:"required_min_app_version,omitempty"`
+	LastCheckedAt         *time.Time `json:"last_checked_at,omitempty"`
+}
+
+type SyncBlockedError struct {
+	Readiness SyncReadiness
+}
+
+func (e *SyncBlockedError) Error() string {
+	if e == nil {
+		return ErrSyncBlockedByReadiness.Error()
+	}
+	if strings.TrimSpace(e.Readiness.ReasonText) != "" {
+		return e.Readiness.ReasonText
+	}
+	return ErrSyncBlockedByReadiness.Error()
+}
+
+func (s *Service) EnsureReadinessForSync() (*SyncReadiness, error) {
+	readiness, err := s.GetReadiness()
+	if err != nil {
+		return nil, err
+	}
+	if readiness.Blocked {
+		return readiness, &SyncBlockedError{Readiness: *readiness}
+	}
+	return readiness, nil
+}
+
+func (s *Service) GetReadiness() (*SyncReadiness, error) {
+	now := time.Now().UTC()
+	if !s.isOnline() {
+		return s.blockedReadiness(
+			now,
+			"OFFLINE_UNVERIFIED_SCHEMA",
+			"Синхронизация недоступна: нет соединения с сервером и нельзя проверить миграции локальной БД.",
+			nil,
+		)
+	}
+
+	mariaDB, err := s.getDB()
+	if err != nil || mariaDB == nil {
+		return s.blockedReadiness(
+			now,
+			"OFFLINE_UNVERIFIED_SCHEMA",
+			"Синхронизация недоступна: нет соединения с сервером и нельзя проверить миграции локальной БД.",
+			nil,
+		)
+	}
+
+	migrations, err := listActiveClientMigrations(mariaDB)
+	if err != nil {
+		return s.blockedReadiness(
+			now,
+			"REMOTE_MIGRATION_REGISTRY_UNAVAILABLE",
+			"Синхронизация заблокирована: не удалось проверить централизованные миграции локальной БД.",
+			nil,
+		)
+	}
+
+	for i := range migrations {
+		m := migrations[i]
+		if strings.TrimSpace(m.MinAppVersion) != "" {
+			if compareVersions(appmeta.Version(), m.MinAppVersion) < 0 {
+				min := m.MinAppVersion
+				return s.blockedReadiness(
+					now,
+					"MIN_APP_VERSION_REQUIRED",
+					fmt.Sprintf("Требуется обновление приложения до версии %s для безопасной синхронизации.", m.MinAppVersion),
+					&min,
+				)
+			}
+		}
+	}
+
+	if err := s.applyMissingRemoteMigrations(migrations); err != nil {
+		if strings.Contains(strings.ToLower(err.Error()), "checksum") {
+			return s.blockedReadiness(
+				now,
+				"REMOTE_MIGRATION_CHECKSUM_MISMATCH",
+				"Синхронизация заблокирована: контрольная сумма миграции не совпадает.",
+				nil,
+			)
+		}
+		return s.blockedReadiness(
+			now,
+			"LOCAL_MIGRATION_APPLY_FAILED",
+			"Синхронизация заблокирована: не удалось применить миграции локальной БД.",
+			nil,
+		)
+	}
+
+	if err := s.reportClientSchemaState(mariaDB, now); err != nil {
+		slog.Warn("failed to report client schema state", "error", err)
+	}
+
+	ready := &SyncReadiness{Status: ReadinessReady, Blocked: false, LastCheckedAt: &now}
+	if setErr := s.localDB.SetSyncGuardState(ReadinessReady, "", "", nil, &now); setErr != nil {
+		slog.Warn("failed to persist sync guard state", "error", setErr)
+	}
+	return ready, nil
+}
+
+func (s *Service) blockedReadiness(now time.Time, code, text string, minVersion *string) (*SyncReadiness, error) {
+	readiness := &SyncReadiness{
+		Status:                ReadinessBlocked,
+		Blocked:               true,
+		ReasonCode:            code,
+		ReasonText:            text,
+		RequiredMinAppVersion: minVersion,
+		LastCheckedAt:         &now,
+	}
+	if err := s.localDB.SetSyncGuardState(ReadinessBlocked, code, text, minVersion, &now); err != nil {
+		slog.Warn("failed to persist blocked sync guard state", "error", err)
+	}
+	return readiness, nil
+}
+
+func (s *Service) isOnline() bool {
+	if s.directDB != nil {
+		return true
+	}
+	if s.connMgr == nil {
+		return false
+	}
+	return s.connMgr.IsOnline()
+}
+
+type clientLocalMigration struct {
+	ID            string    `gorm:"column:id"`
+	Name          string    `gorm:"column:name"`
+	SQLText       string    `gorm:"column:sql_text"`
+	Checksum      string    `gorm:"column:checksum"`
+	MinAppVersion string    `gorm:"column:min_app_version"`
+	OrderNo       int       `gorm:"column:order_no"`
+	CreatedAt     time.Time `gorm:"column:created_at"`
+}
+
+func listActiveClientMigrations(db *gorm.DB) ([]clientLocalMigration, error) {
+	if strings.EqualFold(db.Dialector.Name(), "sqlite") {
+		return []clientLocalMigration{}, nil
+	}
+	if err := ensureClientMigrationRegistryTable(db); err != nil {
+		return nil, err
+	}
+
+	rows := make([]clientLocalMigration, 0)
+	if err := db.Raw(`
+		SELECT id, name, sql_text, checksum, COALESCE(min_app_version, '') AS min_app_version, order_no, created_at
+		FROM qt_client_local_migrations
+		WHERE is_active = 1
+		ORDER BY order_no ASC, created_at ASC, id ASC
+	`).Scan(&rows).Error; err != nil {
+		return nil, fmt.Errorf("load client local migrations: %w", err)
+	}
+
+	return rows, nil
+}
+
+func ensureClientMigrationRegistryTable(db *gorm.DB) error {
+	// Check if table exists instead of trying to create (avoids permission issues)
+	if !tableExists(db, "qt_client_local_migrations") {
+		if err := db.Exec(`
+			CREATE TABLE IF NOT EXISTS qt_client_local_migrations (
+				id VARCHAR(128) NOT NULL,
+				name VARCHAR(255) NOT NULL,
+				sql_text LONGTEXT NOT NULL,
+				checksum VARCHAR(128) NOT NULL,
+				min_app_version VARCHAR(64) NULL,
+				order_no INT NOT NULL DEFAULT 0,
+				is_active TINYINT(1) NOT NULL DEFAULT 1,
+				created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+				PRIMARY KEY (id),
+				INDEX idx_qt_client_local_migrations_active_order (is_active, order_no, created_at)
+			)
+		`).Error; err != nil {
+			return fmt.Errorf("create qt_client_local_migrations table: %w", err)
+		}
+	}
+
+	if !tableExists(db, "qt_client_schema_state") {
+		if err := db.Exec(`
+			CREATE TABLE IF NOT EXISTS qt_client_schema_state (
+				username VARCHAR(100) NOT NULL,
+				last_applied_migration_id VARCHAR(128) NULL,
+				app_version VARCHAR(64) NULL,
+				last_checked_at DATETIME NOT NULL,
+				updated_at DATETIME NOT NULL,
+				PRIMARY KEY (username),
+				INDEX idx_qt_client_schema_state_checked (last_checked_at)
+			)
+		`).Error; err != nil {
+			return fmt.Errorf("create qt_client_schema_state table: %w", err)
+		}
+	}
+	return nil
+}
+
+func tableExists(db *gorm.DB, tableName string) bool {
+	var count int64
+	// For MariaDB/MySQL, check information_schema
+	if err := db.Raw(`
+		SELECT COUNT(*) FROM information_schema.TABLES
+		WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = ?
+	`, tableName).Scan(&count).Error; err != nil {
+		return false
+	}
+	return count > 0
+}
+
+func (s *Service) applyMissingRemoteMigrations(migrations []clientLocalMigration) error {
+	for i := range migrations {
+		m := migrations[i]
+		computedChecksum := digestSQL(m.SQLText)
+		checksum := strings.TrimSpace(m.Checksum)
+		if checksum == "" {
+			checksum = computedChecksum
+		} else if !strings.EqualFold(checksum, computedChecksum) {
+			return fmt.Errorf("checksum mismatch for migration %s", m.ID)
+		}
+
+		applied, err := s.localDB.GetRemoteMigrationApplied(m.ID)
+		if err == nil {
+			if strings.TrimSpace(applied.Checksum) != checksum {
+				return fmt.Errorf("checksum mismatch for migration %s", m.ID)
+			}
+			continue
+		}
+		if !errors.Is(err, gorm.ErrRecordNotFound) {
+			return fmt.Errorf("check local applied migration %s: %w", m.ID, err)
+		}
+
+		if strings.TrimSpace(m.SQLText) == "" {
+			if err := s.localDB.UpsertRemoteMigrationApplied(m.ID, checksum, appmeta.Version(), time.Now().UTC()); err != nil {
+				return fmt.Errorf("mark empty migration %s as applied: %w", m.ID, err)
+			}
+			continue
+		}
+
+		statements := splitSQLStatementsLite(m.SQLText)
+		if err := s.localDB.DB().Transaction(func(tx *gorm.DB) error {
+			for _, stmt := range statements {
+				if err := tx.Exec(stmt).Error; err != nil {
+					return fmt.Errorf("apply migration %s statement %q: %w", m.ID, stmt, err)
+				}
+			}
+			return nil
+		}); err != nil {
+			return err
+		}
+
+		if err := s.localDB.UpsertRemoteMigrationApplied(m.ID, checksum, appmeta.Version(), time.Now().UTC()); err != nil {
+			return fmt.Errorf("record applied migration %s: %w", m.ID, err)
+		}
+	}
+	return nil
+}
+
+func splitSQLStatementsLite(script string) []string {
+	scanner := bufio.NewScanner(strings.NewReader(script))
+	scanner.Buffer(make([]byte, 1024), 1024*1024)
+
+	lines := make([]string, 0, 64)
+	for scanner.Scan() {
+		line := strings.TrimSpace(scanner.Text())
+		if line == "" || strings.HasPrefix(line, "--") {
+			continue
+		}
+		lines = append(lines, scanner.Text())
+	}
+	combined := strings.Join(lines, "\n")
+	raw := strings.Split(combined, ";")
+	stmts := make([]string, 0, len(raw))
+	for _, stmt := range raw {
+		trimmed := strings.TrimSpace(stmt)
+		if trimmed == "" {
+			continue
+		}
+		stmts = append(stmts, trimmed)
+	}
+	return stmts
+}
+
+func digestSQL(sqlText string) string {
+	hash := sha256.Sum256([]byte(sqlText))
+	return hex.EncodeToString(hash[:])
+}
+
+func compareVersions(left, right string) int {
+	leftParts := normalizeVersionParts(left)
+	rightParts := normalizeVersionParts(right)
+	maxLen := len(leftParts)
+	if len(rightParts) > maxLen {
+		maxLen = len(rightParts)
+	}
+	for i := 0; i < maxLen; i++ {
+		lv := 0
+		rv := 0
+		if i < len(leftParts) {
+			lv = leftParts[i]
+		}
+		if i < len(rightParts) {
+			rv = rightParts[i]
+		}
+		if lv < rv {
+			return -1
+		}
+		if lv > rv {
+			return 1
+		}
+	}
+	return 0
+}
+
+func (s *Service) reportClientSchemaState(mariaDB *gorm.DB, checkedAt time.Time) error {
+	if strings.EqualFold(mariaDB.Dialector.Name(), "sqlite") {
+		return nil
+	}
+	username := strings.TrimSpace(s.localDB.GetDBUser())
+	if username == "" {
+		return nil
+	}
+	lastMigrationID := ""
+	if id, err := s.localDB.GetLatestAppliedRemoteMigrationID(); err == nil {
+		lastMigrationID = id
+	}
+	return mariaDB.Exec(`
+		INSERT INTO qt_client_schema_state (username, last_applied_migration_id, app_version, last_checked_at, updated_at)
+		VALUES (?, ?, ?, ?, ?)
+		ON DUPLICATE KEY UPDATE
+			last_applied_migration_id = VALUES(last_applied_migration_id),
+			app_version = VALUES(app_version),
+			last_checked_at = VALUES(last_checked_at),
+			updated_at = VALUES(updated_at)
+	`, username, lastMigrationID, appmeta.Version(), checkedAt, checkedAt).Error
+}
+
+func normalizeVersionParts(v string) []int {
+	trimmed := strings.TrimSpace(v)
+	trimmed = strings.TrimPrefix(trimmed, "v")
+	chunks := strings.Split(trimmed, ".")
+	parts := make([]int, 0, len(chunks))
+	for _, chunk := range chunks {
+		clean := strings.TrimSpace(chunk)
+		if clean == "" {
+			parts = append(parts, 0)
+			continue
+		}
+		n := 0
+		for i := 0; i < len(clean); i++ {
+			if clean[i] < '0' || clean[i] > '9' {
+				clean = clean[:i]
+				break
+			}
+		}
+		if clean != "" {
+			if parsed, err := strconv.Atoi(clean); err == nil {
+				n = parsed
+			}
+		}
+		parts = append(parts, n)
+	}
+	return parts
+}
+
+func toReadinessFromState(state *localdb.LocalSyncGuardState) *SyncReadiness {
+	if state == nil {
+		return nil
+	}
+	blocked := state.Status == ReadinessBlocked
+	return &SyncReadiness{
+		Status:                state.Status,
+		Blocked:               blocked,
+		ReasonCode:            state.ReasonCode,
+		ReasonText:            state.ReasonText,
+		RequiredMinAppVersion: state.RequiredMinAppVersion,
+		LastCheckedAt:         state.LastCheckedAt,
+	}
+}

internal/services/sync/service_order_test.go

@@ -0,0 +1,25 @@
+package sync
+
+import (
+	"testing"
+
+	"git.mchus.pro/mchus/quoteforge/internal/localdb"
+)
+
+func TestPrioritizeProjectChanges(t *testing.T) {
+	changes := []localdb.PendingChange{
+		{ID: 1, EntityType: "configuration"},
+		{ID: 2, EntityType: "project"},
+		{ID: 3, EntityType: "configuration"},
+		{ID: 4, EntityType: "project"},
+	}
+
+	sorted := prioritizeProjectChanges(changes)
+	if len(sorted) != 4 {
+		t.Fatalf("unexpected sorted length: %d", len(sorted))
+	}
+
+	if sorted[0].EntityType != "project" || sorted[1].EntityType != "project" {
+		t.Fatalf("expected project changes first, got order: %s, %s", sorted[0].EntityType, sorted[1].EntityType)
+	}
+}

internal/services/sync/service_pricelist_cleanup_test.go

@@ -0,0 +1,85 @@
+package sync_test
+
+import (
+	"testing"
+	"time"
+
+	"git.mchus.pro/mchus/quoteforge/internal/localdb"
+	"git.mchus.pro/mchus/quoteforge/internal/models"
+	syncsvc "git.mchus.pro/mchus/quoteforge/internal/services/sync"
+)
+
+func TestSyncPricelistsDeletesMissingUnusedLocalPricelists(t *testing.T) {
+	local := newLocalDBForSyncTest(t)
+	serverDB := newServerDBForSyncTest(t)
+	if err := serverDB.AutoMigrate(&models.Pricelist{}, &models.PricelistItem{}); err != nil {
+		t.Fatalf("migrate server pricelist tables: %v", err)
+	}
+
+	serverPL := models.Pricelist{
+		Source:       "estimate",
+		Version:      "2026-01-01-001",
+		Notification: "server",
+		CreatedBy:    "tester",
+		IsActive:     true,
+		CreatedAt:    time.Now().Add(-1 * time.Hour),
+	}
+	if err := serverDB.Create(&serverPL).Error; err != nil {
+		t.Fatalf("create server pricelist: %v", err)
+	}
+	if err := serverDB.Create(&models.PricelistItem{PricelistID: serverPL.ID, LotName: "CPU_A", Price: 10}).Error; err != nil {
+		t.Fatalf("create server pricelist item: %v", err)
+	}
+
+	if err := local.SaveLocalPricelist(&localdb.LocalPricelist{
+		ServerID:  9991,
+		Source:    "estimate",
+		Version:   "old-unused",
+		Name:      "old-unused",
+		CreatedAt: time.Now().Add(-2 * time.Hour),
+		SyncedAt:  time.Now().Add(-2 * time.Hour),
+		IsUsed:    false,
+	}); err != nil {
+		t.Fatalf("seed local missing pricelist: %v", err)
+	}
+	missingUsed := &localdb.LocalPricelist{
+		ServerID:  9992,
+		Source:    "estimate",
+		Version:   "old-used",
+		Name:      "old-used",
+		CreatedAt: time.Now().Add(-2 * time.Hour),
+		SyncedAt:  time.Now().Add(-2 * time.Hour),
+		IsUsed:    false,
+	}
+	if err := local.SaveLocalPricelist(missingUsed); err != nil {
+		t.Fatalf("seed local referenced pricelist: %v", err)
+	}
+	if err := local.SaveConfiguration(&localdb.LocalConfiguration{
+		UUID:             "cfg-1",
+		OriginalUsername: "tester",
+		Name:             "cfg",
+		Items:            localdb.LocalConfigItems{{LotName: "CPU_A", Quantity: 1, UnitPrice: 1}},
+		IsActive:         true,
+		PricelistID:      &missingUsed.ServerID,
+		SyncStatus:       "synced",
+		CreatedAt:        time.Now().Add(-30 * time.Minute),
+		UpdatedAt:        time.Now().Add(-30 * time.Minute),
+	}); err != nil {
+		t.Fatalf("seed local configuration with pricelist ref: %v", err)
+	}
+
+	svc := syncsvc.NewServiceWithDB(serverDB, local)
+	if _, err := svc.SyncPricelists(); err != nil {
+		t.Fatalf("sync pricelists: %v", err)
+	}
+
+	if _, err := local.GetLocalPricelistByServerID(9991); err == nil {
+		t.Fatalf("expected unused missing local pricelist to be deleted")
+	}
+	if _, err := local.GetLocalPricelistByServerID(9992); err != nil {
+		t.Fatalf("expected local pricelist referenced by active config to stay: %v", err)
+	}
+	if _, err := local.GetLocalPricelistByServerID(serverPL.ID); err != nil {
+		t.Fatalf("expected server pricelist to be synced locally: %v", err)
+	}
+}

internal/services/sync/service_projects_push_test.go

@@ -0,0 +1,378 @@
+package sync_test
+
+import (
+	"encoding/json"
+	"fmt"
+	"path/filepath"
+	"testing"
+	"time"
+
+	"git.mchus.pro/mchus/quoteforge/internal/localdb"
+	"git.mchus.pro/mchus/quoteforge/internal/models"
+	"git.mchus.pro/mchus/quoteforge/internal/services"
+	syncsvc "git.mchus.pro/mchus/quoteforge/internal/services/sync"
+	"github.com/glebarez/sqlite"
+	"gorm.io/gorm"
+)
+
+func TestPushPendingChangesProjectsBeforeConfigurations(t *testing.T) {
+	local := newLocalDBForSyncTest(t)
+	serverDB := newServerDBForSyncTest(t)
+
+	localSync := syncsvc.NewService(nil, local)
+	projectService := services.NewProjectService(local)
+	configService := services.NewLocalConfigurationService(local, localSync, &services.QuoteService{}, func() bool { return false })
+
+	project, err := projectService.Create("tester", &services.CreateProjectRequest{Name: "Project A"})
+	if err != nil {
+		t.Fatalf("create project: %v", err)
+	}
+
+	cfg, err := configService.Create("tester", &services.CreateConfigRequest{
+		Name:        "Cfg A",
+		Items:       models.ConfigItems{{LotName: "CPU_A", Quantity: 1, UnitPrice: 1000}},
+		ServerCount: 1,
+		ProjectUUID: &project.UUID,
+	})
+	if err != nil {
+		t.Fatalf("create config: %v", err)
+	}
+
+	pushService := syncsvc.NewServiceWithDB(serverDB, local)
+	pushed, err := pushService.PushPendingChanges()
+	if err != nil {
+		t.Fatalf("push pending changes: %v", err)
+	}
+	if pushed < 2 {
+		t.Fatalf("expected at least 2 pushed changes, got %d", pushed)
+	}
+
+	var serverProject models.Project
+	if err := serverDB.Where("uuid = ?", project.UUID).First(&serverProject).Error; err != nil {
+		t.Fatalf("project not pushed to server: %v", err)
+	}
+
+	var serverCfg models.Configuration
+	if err := serverDB.Where("uuid = ?", cfg.UUID).First(&serverCfg).Error; err != nil {
+		t.Fatalf("configuration not pushed to server: %v", err)
+	}
+	if serverCfg.ProjectUUID == nil || *serverCfg.ProjectUUID != project.UUID {
+		t.Fatalf("expected project_uuid=%s on pushed config, got %v", project.UUID, serverCfg.ProjectUUID)
+	}
+
+	if got := local.CountPendingChanges(); got != 0 {
+		t.Fatalf("expected pending queue to be empty, got %d", got)
+	}
+}
+
+func TestPushPendingChangesProjectCreateThenUpdateBeforeFirstPush(t *testing.T) {
+	local := newLocalDBForSyncTest(t)
+	serverDB := newServerDBForSyncTest(t)
+
+	localSync := syncsvc.NewService(nil, local)
+	projectService := services.NewProjectService(local)
+	configService := services.NewLocalConfigurationService(local, localSync, &services.QuoteService{}, func() bool { return false })
+	pushService := syncsvc.NewServiceWithDB(serverDB, local)
+
+	project, err := projectService.Create("tester", &services.CreateProjectRequest{Name: "Project v1"})
+	if err != nil {
+		t.Fatalf("create project: %v", err)
+	}
+	if _, err := projectService.Update(project.UUID, "tester", &services.UpdateProjectRequest{Name: "Project v2"}); err != nil {
+		t.Fatalf("update project: %v", err)
+	}
+
+	cfg, err := configService.Create("tester", &services.CreateConfigRequest{
+		Name:        "Cfg linked",
+		Items:       models.ConfigItems{{LotName: "CPU_A", Quantity: 1, UnitPrice: 1000}},
+		ServerCount: 1,
+		ProjectUUID: &project.UUID,
+	})
+	if err != nil {
+		t.Fatalf("create config: %v", err)
+	}
+
+	if _, err := pushService.PushPendingChanges(); err != nil {
+		t.Fatalf("push pending changes: %v", err)
+	}
+
+	var serverProject models.Project
+	if err := serverDB.Where("uuid = ?", project.UUID).First(&serverProject).Error; err != nil {
+		t.Fatalf("project not pushed to server: %v", err)
+	}
+	if serverProject.Name != "Project v2" {
+		t.Fatalf("expected latest project name, got %q", serverProject.Name)
+	}
+
+	var serverCfg models.Configuration
+	if err := serverDB.Where("uuid = ?", cfg.UUID).First(&serverCfg).Error; err != nil {
+		t.Fatalf("configuration not pushed to server: %v", err)
+	}
+	if serverCfg.ProjectUUID == nil || *serverCfg.ProjectUUID != project.UUID {
+		t.Fatalf("expected project_uuid=%s on pushed config, got %v", project.UUID, serverCfg.ProjectUUID)
+	}
+}
+
+func TestPushPendingChangesSkipsStaleUpdateAndAppliesLatest(t *testing.T) {
+	local := newLocalDBForSyncTest(t)
+	serverDB := newServerDBForSyncTest(t)
+
+	localSync := syncsvc.NewService(nil, local)
+	configService := services.NewLocalConfigurationService(local, localSync, &services.QuoteService{}, func() bool { return false })
+	pushService := syncsvc.NewServiceWithDB(serverDB, local)
+
+	created, err := configService.Create("tester", &services.CreateConfigRequest{
+		Name:        "Cfg v1",
+		Items:       models.ConfigItems{{LotName: "CPU_A", Quantity: 1, UnitPrice: 1000}},
+		ServerCount: 1,
+	})
+	if err != nil {
+		t.Fatalf("create config: %v", err)
+	}
+	if _, err := pushService.PushPendingChanges(); err != nil {
+		t.Fatalf("initial push: %v", err)
+	}
+
+	if _, err := configService.UpdateNoAuth(created.UUID, &services.CreateConfigRequest{
+		Name:        "Cfg v2",
+		Items:       models.ConfigItems{{LotName: "CPU_A", Quantity: 2, UnitPrice: 1000}},
+		ServerCount: 1,
+		ProjectUUID: created.ProjectUUID,
+	}); err != nil {
+		t.Fatalf("update config: %v", err)
+	}
+
+	localCfg, err := local.GetConfigurationByUUID(created.UUID)
+	if err != nil {
+		t.Fatalf("get local config: %v", err)
+	}
+	cfgSnapshot := localdb.LocalToConfiguration(localCfg)
+	stalePayload := syncsvc.ConfigurationChangePayload{
+		EventID:           "stale-event",
+		IdempotencyKey:    fmt.Sprintf("%s:v1:update", created.UUID),
+		ConfigurationUUID: created.UUID,
+		ProjectUUID:       cfgSnapshot.ProjectUUID,
+		Operation:         "update",
+		CurrentVersionID:  "stale-v1",
+		CurrentVersionNo:  1,
+		ConflictPolicy:    "last_write_wins",
+		Snapshot:          *cfgSnapshot,
+		CreatedAt:         time.Now().UTC().Add(-2 * time.Second),
+	}
+	raw, err := json.Marshal(stalePayload)
+	if err != nil {
+		t.Fatalf("marshal stale payload: %v", err)
+	}
+	if err := local.DB().Create(&localdb.PendingChange{
+		EntityType: "configuration",
+		EntityUUID: created.UUID,
+		Operation:  "update",
+		Payload:    string(raw),
+		CreatedAt:  time.Now().Add(-1 * time.Second),
+	}).Error; err != nil {
+		t.Fatalf("insert stale pending change: %v", err)
+	}
+
+	if _, err := pushService.PushPendingChanges(); err != nil {
+		t.Fatalf("push pending with stale event: %v", err)
+	}
+
+	var serverCfg models.Configuration
+	if err := serverDB.Where("uuid = ?", created.UUID).First(&serverCfg).Error; err != nil {
+		t.Fatalf("get server config: %v", err)
+	}
+	if serverCfg.Name != "Cfg v2" {
+		t.Fatalf("expected latest name to win, got %q", serverCfg.Name)
+	}
+	if got := local.CountPendingChanges(); got != 0 {
+		t.Fatalf("expected empty pending queue, got %d", got)
+	}
+}
+
+func TestPushPendingChangesCreateIsIdempotent(t *testing.T) {
+	local := newLocalDBForSyncTest(t)
+	serverDB := newServerDBForSyncTest(t)
+
+	localSync := syncsvc.NewService(nil, local)
+	configService := services.NewLocalConfigurationService(local, localSync, &services.QuoteService{}, func() bool { return false })
+	pushService := syncsvc.NewServiceWithDB(serverDB, local)
+
+	created, err := configService.Create("tester", &services.CreateConfigRequest{
+		Name:        "Cfg Idempotent",
+		Items:       models.ConfigItems{{LotName: "CPU_B", Quantity: 1, UnitPrice: 500}},
+		ServerCount: 1,
+	})
+	if err != nil {
+		t.Fatalf("create config: %v", err)
+	}
+	if _, err := pushService.PushPendingChanges(); err != nil {
+		t.Fatalf("initial push: %v", err)
+	}
+
+	localCfg, err := local.GetConfigurationByUUID(created.UUID)
+	if err != nil {
+		t.Fatalf("get local config: %v", err)
+	}
+	currentVersionNo, currentVersionID := getCurrentVersionInfo(t, local, created.UUID, localCfg.CurrentVersionID)
+	cfgSnapshot := localdb.LocalToConfiguration(localCfg)
+	duplicatePayload := syncsvc.ConfigurationChangePayload{
+		EventID:           "duplicate-create-event",
+		IdempotencyKey:    fmt.Sprintf("%s:v%d:create", created.UUID, currentVersionNo),
+		ConfigurationUUID: created.UUID,
+		ProjectUUID:       cfgSnapshot.ProjectUUID,
+		Operation:         "create",
+		CurrentVersionID:  currentVersionID,
+		CurrentVersionNo:  currentVersionNo,
+		ConflictPolicy:    "last_write_wins",
+		Snapshot:          *cfgSnapshot,
+		CreatedAt:         time.Now().UTC(),
+	}
+	raw, err := json.Marshal(duplicatePayload)
+	if err != nil {
+		t.Fatalf("marshal duplicate payload: %v", err)
+	}
+	if err := local.AddPendingChange("configuration", created.UUID, "create", string(raw)); err != nil {
+		t.Fatalf("add duplicate create pending change: %v", err)
+	}
+
+	if pushed, err := pushService.PushPendingChanges(); err != nil {
+		t.Fatalf("push duplicate create: %v", err)
+	} else if pushed != 1 {
+		t.Fatalf("expected 1 pushed change for duplicate create, got %d", pushed)
+	}
+
+	var count int64
+	if err := serverDB.Model(&models.Configuration{}).Where("uuid = ?", created.UUID).Count(&count).Error; err != nil {
+		t.Fatalf("count server configs: %v", err)
+	}
+	if count != 1 {
+		t.Fatalf("expected one server row after idempotent create, got %d", count)
+	}
+}
+
+func TestPushPendingChangesCreateThenUpdateBeforeFirstPush(t *testing.T) {
+	local := newLocalDBForSyncTest(t)
+	serverDB := newServerDBForSyncTest(t)
+
+	localSync := syncsvc.NewService(nil, local)
+	configService := services.NewLocalConfigurationService(local, localSync, &services.QuoteService{}, func() bool { return false })
+	pushService := syncsvc.NewServiceWithDB(serverDB, local)
+
+	created, err := configService.Create("tester", &services.CreateConfigRequest{
+		Name:        "Cfg v1",
+		Items:       models.ConfigItems{{LotName: "CPU_X", Quantity: 1, UnitPrice: 700}},
+		ServerCount: 1,
+	})
+	if err != nil {
+		t.Fatalf("create config: %v", err)
+	}
+
+	if _, err := configService.UpdateNoAuth(created.UUID, &services.CreateConfigRequest{
+		Name:        "Cfg v2",
+		Items:       models.ConfigItems{{LotName: "CPU_X", Quantity: 3, UnitPrice: 700}},
+		ServerCount: 1,
+		ProjectUUID: created.ProjectUUID,
+	}); err != nil {
+		t.Fatalf("update config before first push: %v", err)
+	}
+
+	pushed, err := pushService.PushPendingChanges()
+	if err != nil {
+		t.Fatalf("push pending changes: %v", err)
+	}
+	if pushed < 1 {
+		t.Fatalf("expected at least one pushed change, got %d", pushed)
+	}
+
+	var serverCfg models.Configuration
+	if err := serverDB.Where("uuid = ?", created.UUID).First(&serverCfg).Error; err != nil {
+		t.Fatalf("configuration not pushed to server: %v", err)
+	}
+	if serverCfg.Name != "Cfg v2" {
+		t.Fatalf("expected latest update to be pushed, got %q", serverCfg.Name)
+	}
+
+	localCfg, err := local.GetConfigurationByUUID(created.UUID)
+	if err != nil {
+		t.Fatalf("get local config: %v", err)
+	}
+	if localCfg.ServerID == nil || *localCfg.ServerID == 0 {
+		t.Fatalf("expected local configuration to have server_id after push, got %+v", localCfg.ServerID)
+	}
+}
+
+func newLocalDBForSyncTest(t *testing.T) *localdb.LocalDB {
+	t.Helper()
+	localPath := filepath.Join(t.TempDir(), "local.db")
+	local, err := localdb.New(localPath)
+	if err != nil {
+		t.Fatalf("init local db: %v", err)
+	}
+	t.Cleanup(func() { _ = local.Close() })
+	return local
+}
+
+func newServerDBForSyncTest(t *testing.T) *gorm.DB {
+	t.Helper()
+	serverPath := filepath.Join(t.TempDir(), "server.db")
+	db, err := gorm.Open(sqlite.Open(serverPath), &gorm.Config{})
+	if err != nil {
+		t.Fatalf("open server sqlite: %v", err)
+	}
+	if err := db.Exec(`
+CREATE TABLE qt_projects (
+	id INTEGER PRIMARY KEY AUTOINCREMENT,
+	uuid TEXT NOT NULL UNIQUE,
+	owner_username TEXT NOT NULL,
+	name TEXT NOT NULL,
+	tracker_url TEXT NULL,
+	is_active INTEGER NOT NULL DEFAULT 1,
+	is_system INTEGER NOT NULL DEFAULT 0,
+	created_at DATETIME,
+	updated_at DATETIME
+);`).Error; err != nil {
+		t.Fatalf("create qt_projects: %v", err)
+	}
+	if err := db.Exec(`
+CREATE TABLE qt_configurations (
+	id INTEGER PRIMARY KEY AUTOINCREMENT,
+	uuid TEXT NOT NULL UNIQUE,
+	user_id INTEGER NULL,
+	owner_username TEXT NOT NULL,
+	project_uuid TEXT NULL,
+	app_version TEXT NULL,
+	name TEXT NOT NULL,
+	items TEXT NOT NULL,
+	total_price REAL NULL,
+	custom_price REAL NULL,
+	notes TEXT NULL,
+	is_template INTEGER NOT NULL DEFAULT 0,
+	server_count INTEGER NOT NULL DEFAULT 1,
+	pricelist_id INTEGER NULL,
+	warehouse_pricelist_id INTEGER NULL,
+	competitor_pricelist_id INTEGER NULL,
+	disable_price_refresh INTEGER NOT NULL DEFAULT 0,
+	only_in_stock INTEGER NOT NULL DEFAULT 0,
+	price_updated_at DATETIME NULL,
+	created_at DATETIME
+);`).Error; err != nil {
+		t.Fatalf("create qt_configurations: %v", err)
+	}
+	return db
+}
+
+func getCurrentVersionInfo(t *testing.T, local *localdb.LocalDB, configurationUUID string, currentVersionID *string) (int, string) {
+	t.Helper()
+	if currentVersionID == nil || *currentVersionID == "" {
+		t.Fatalf("current version id is empty for %s", configurationUUID)
+	}
+
+	var version localdb.LocalConfigurationVersion
+	if err := local.DB().
+		Where("id = ? AND configuration_uuid = ?", *currentVersionID, configurationUUID).
+		First(&version).Error; err != nil {
+		t.Fatalf("get current version info: %v", err)
+	}
+
+	return version.VersionNo, version.ID
+}

internal/services/sync/worker.go

@@ -71,6 +71,15 @@ func (w *Worker) runSync() {
 		return
 	}
 
+	if readiness, err := w.service.EnsureReadinessForSync(); err != nil {
+		w.logger.Warn("background sync: blocked by readiness guard",
+			"error", err,
+			"reason_code", readiness.ReasonCode,
+			"reason_text", readiness.ReasonText,
+		)
+		return
+	}
+
 	// Push pending changes first
 	pushed, err := w.service.PushPendingChanges()
 	if err != nil {
@@ -83,7 +92,11 @@ func (w *Worker) runSync() {
 	err = w.service.SyncPricelistsIfNeeded()
 	if err != nil {
 		w.logger.Warn("background sync: failed to sync pricelists", "error", err)
+		return
 	}
 
+	// Mark user's sync heartbeat (used for online/offline status in UI).
+	w.service.RecordSyncHeartbeat()
+
 	w.logger.Info("background sync cycle completed")
 }

migrations/005_add_owner_username.sql

@@ -0,0 +1,10 @@
+-- Store configuration owner as username (instead of relying on numeric user_id)
+ALTER TABLE qt_configurations
+    ADD COLUMN owner_username VARCHAR(100) NOT NULL DEFAULT '' AFTER user_id,
+    ADD INDEX idx_qt_configurations_owner_username (owner_username);
+
+-- Backfill owner_username from qt_users for existing rows
+UPDATE qt_configurations c
+LEFT JOIN qt_users u ON u.id = c.user_id
+SET c.owner_username = COALESCE(u.username, c.owner_username)
+WHERE c.owner_username = '';

migrations/006_add_local_configuration_versions.sql

@@ -0,0 +1,80 @@
+-- Add full-snapshot versioning for local configurations (SQLite)
+-- 1) Create local_configuration_versions
+-- 2) Add current_version_id to local_configurations
+-- 3) Backfill v1 snapshots from existing local_configurations
+
+PRAGMA foreign_keys = ON;
+
+BEGIN TRANSACTION;
+
+CREATE TABLE local_configuration_versions (
+    id TEXT PRIMARY KEY,
+    configuration_uuid TEXT NOT NULL,
+    version_no INTEGER NOT NULL,
+    data TEXT NOT NULL,
+    change_note TEXT NULL,
+    created_by TEXT NULL,
+    app_version TEXT NULL,
+    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    FOREIGN KEY (configuration_uuid) REFERENCES local_configurations(uuid),
+    UNIQUE(configuration_uuid, version_no)
+);
+
+ALTER TABLE local_configurations
+    ADD COLUMN current_version_id TEXT NULL;
+
+CREATE INDEX idx_lcv_config_created
+    ON local_configuration_versions(configuration_uuid, created_at DESC);
+
+CREATE INDEX idx_lcv_config_version
+    ON local_configuration_versions(configuration_uuid, version_no DESC);
+
+-- Backfill v1 snapshot for every existing configuration.
+INSERT INTO local_configuration_versions (
+    id,
+    configuration_uuid,
+    version_no,
+    data,
+    change_note,
+    created_by,
+    app_version,
+    created_at
+)
+SELECT
+    uuid || '-v1' AS id,
+    uuid AS configuration_uuid,
+    1 AS version_no,
+    json_object(
+        'uuid', uuid,
+        'server_id', server_id,
+        'name', name,
+        'items', CASE WHEN json_valid(items) THEN json(items) ELSE items END,
+        'total_price', total_price,
+        'custom_price', custom_price,
+        'notes', notes,
+        'is_template', is_template,
+        'server_count', server_count,
+        'price_updated_at', price_updated_at,
+        'created_at', created_at,
+        'updated_at', updated_at,
+        'synced_at', synced_at,
+        'sync_status', sync_status,
+        'original_user_id', original_user_id,
+        'original_username', original_username,
+        'app_version', NULL
+    ) AS data,
+    'Initial snapshot backfill (v1)' AS change_note,
+    NULL AS created_by,
+    NULL AS app_version,
+    COALESCE(created_at, CURRENT_TIMESTAMP) AS created_at
+FROM local_configurations;
+
+UPDATE local_configurations
+SET current_version_id = (
+    SELECT lcv.id
+    FROM local_configuration_versions lcv
+    WHERE lcv.configuration_uuid = local_configurations.uuid
+      AND lcv.version_no = 1
+);
+
+COMMIT;

migrations/007_detach_configurations_from_qt_users.sql

@@ -0,0 +1,25 @@
+-- Detach qt_configurations from qt_users (ownership is owner_username text)
+-- Safe for MySQL 8+/MariaDB 10.2+ via INFORMATION_SCHEMA checks.
+
+SET @fk_exists := (
+    SELECT COUNT(*)
+    FROM information_schema.TABLE_CONSTRAINTS
+    WHERE CONSTRAINT_SCHEMA = DATABASE()
+      AND TABLE_NAME = 'qt_configurations'
+      AND CONSTRAINT_NAME = 'fk_qt_configurations_user'
+      AND CONSTRAINT_TYPE = 'FOREIGN KEY'
+);
+
+SET @drop_fk_sql := IF(
+    @fk_exists > 0,
+    'ALTER TABLE qt_configurations DROP FOREIGN KEY fk_qt_configurations_user',
+    'SELECT ''fk_qt_configurations_user not found, skip'' '
+);
+PREPARE stmt_drop_fk FROM @drop_fk_sql;
+EXECUTE stmt_drop_fk;
+DEALLOCATE PREPARE stmt_drop_fk;
+
+-- user_id becomes optional legacy column (can stay NULL)
+ALTER TABLE qt_configurations
+    MODIFY COLUMN user_id BIGINT UNSIGNED NULL;
+

migrations/008_add_app_version_to_configurations.sql

@@ -0,0 +1,4 @@
+-- Track application version used for configuration writes (create/update via sync)
+ALTER TABLE qt_configurations
+    ADD COLUMN app_version VARCHAR(64) NULL DEFAULT NULL AFTER owner_username;
+

migrations/009_add_projects.sql

@@ -0,0 +1,45 @@
+-- Add projects and attach configurations to projects
+
+CREATE TABLE qt_projects (
+    id BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
+    uuid CHAR(36) NOT NULL UNIQUE,
+    owner_username VARCHAR(100) NOT NULL,
+    name VARCHAR(200) NOT NULL,
+    is_active BOOLEAN NOT NULL DEFAULT TRUE,
+    is_system BOOLEAN NOT NULL DEFAULT FALSE,
+    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+    INDEX idx_qt_projects_owner_username (owner_username),
+    INDEX idx_qt_projects_is_active (is_active),
+    INDEX idx_qt_projects_is_system (is_system)
+);
+
+ALTER TABLE qt_configurations
+    ADD COLUMN project_uuid CHAR(36) NULL AFTER app_version,
+    ADD INDEX idx_qt_configurations_project_uuid (project_uuid),
+    ADD CONSTRAINT fk_qt_configurations_project_uuid
+        FOREIGN KEY (project_uuid) REFERENCES qt_projects(uuid)
+        ON UPDATE CASCADE
+        ON DELETE SET NULL;
+
+-- One system project per owner: "Без проекта"
+INSERT INTO qt_projects (uuid, owner_username, name, is_active, is_system, created_at, updated_at)
+SELECT UUID(), owners.owner_username, 'Без проекта', TRUE, TRUE, NOW(), NOW()
+FROM (
+    SELECT DISTINCT owner_username
+    FROM qt_configurations
+) AS owners
+LEFT JOIN qt_projects p
+    ON p.owner_username = owners.owner_username
+   AND p.name = 'Без проекта'
+   AND p.is_system = TRUE
+WHERE p.id IS NULL;
+
+-- Attach all existing configurations without project to the system project
+UPDATE qt_configurations c
+JOIN qt_projects p
+    ON p.owner_username = c.owner_username
+   AND p.name = 'Без проекта'
+   AND p.is_system = TRUE
+SET c.project_uuid = p.uuid
+WHERE c.project_uuid IS NULL OR c.project_uuid = '';

migrations/010_add_pricelist_sync_status.sql

@@ -0,0 +1,8 @@
+CREATE TABLE IF NOT EXISTS qt_pricelist_sync_status (
+    username VARCHAR(100) NOT NULL,
+    last_sync_at DATETIME NOT NULL,
+    updated_at DATETIME NOT NULL,
+    app_version VARCHAR(64) NULL,
+    PRIMARY KEY (username),
+    INDEX idx_qt_pricelist_sync_status_last_sync (last_sync_at)
+);

migrations/010_add_pricelist_to_configurations.sql

@@ -0,0 +1,37 @@
+-- Add pricelist binding to configurations
+ALTER TABLE qt_configurations
+    ADD COLUMN pricelist_id BIGINT UNSIGNED NULL AFTER server_count;
+
+ALTER TABLE qt_configurations
+    ADD INDEX idx_qt_configurations_pricelist_id (pricelist_id),
+    ADD CONSTRAINT fk_qt_configurations_pricelist_id
+        FOREIGN KEY (pricelist_id)
+        REFERENCES qt_pricelists(id)
+        ON DELETE RESTRICT
+        ON UPDATE CASCADE;
+
+-- Backfill existing configurations to latest active pricelist
+SET @latest_active_pricelist_id := (
+    SELECT id
+    FROM qt_pricelists
+    WHERE is_active = 1
+    ORDER BY created_at DESC
+    LIMIT 1
+);
+
+UPDATE qt_configurations
+SET pricelist_id = @latest_active_pricelist_id
+WHERE pricelist_id IS NULL
+  AND @latest_active_pricelist_id IS NOT NULL;
+
+-- Recalculate usage_count from configuration bindings
+UPDATE qt_pricelists SET usage_count = 0;
+
+UPDATE qt_pricelists pl
+JOIN (
+    SELECT pricelist_id, COUNT(*) AS cnt
+    FROM qt_configurations
+    WHERE pricelist_id IS NOT NULL
+    GROUP BY pricelist_id
+) cfg ON cfg.pricelist_id = pl.id
+SET pl.usage_count = cfg.cnt;

migrations/011_add_app_version_to_pricelist_sync_status.sql

@@ -0,0 +1,2 @@
+ALTER TABLE qt_pricelist_sync_status
+    ADD COLUMN IF NOT EXISTS app_version VARCHAR(64) NULL;

migrations/012_add_project_tracker_url.sql

@@ -0,0 +1,7 @@
+ALTER TABLE qt_projects
+    ADD COLUMN tracker_url VARCHAR(500) NULL AFTER name;
+
+UPDATE qt_projects
+SET tracker_url = CONCAT('https://tracker.yandex.ru/', TRIM(name))
+WHERE (tracker_url IS NULL OR tracker_url = '')
+  AND TRIM(COALESCE(name, '')) <> '';

migrations/013_add_pricelist_source.sql

@@ -0,0 +1,15 @@
+ALTER TABLE qt_pricelists
+	ADD COLUMN IF NOT EXISTS source ENUM('estimate', 'warehouse', 'competitor') NOT NULL DEFAULT 'estimate' AFTER id;
+
+UPDATE qt_pricelists
+SET source = 'estimate'
+WHERE source IS NULL OR source = '';
+
+ALTER TABLE qt_pricelists
+	DROP INDEX IF EXISTS idx_qt_pricelists_version;
+
+CREATE UNIQUE INDEX idx_qt_pricelists_source_version
+	ON qt_pricelists(source, version);
+
+CREATE INDEX idx_qt_pricelists_source_created_at
+	ON qt_pricelists(source, created_at);

migrations/014_add_stock_log.sql

@@ -0,0 +1,14 @@
+CREATE TABLE IF NOT EXISTS stock_log (
+    stock_log_id BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
+    lot VARCHAR(255) NOT NULL,
+    supplier VARCHAR(255) NULL,
+    date DATE NOT NULL,
+    price DECIMAL(12,2) NOT NULL,
+    quality VARCHAR(255) NULL,
+    comments TEXT NULL,
+    vendor VARCHAR(255) NULL,
+    qty DECIMAL(14,3) NULL,
+    INDEX idx_stock_log_lot_date (lot, date),
+    INDEX idx_stock_log_date (date),
+    INDEX idx_stock_log_vendor (vendor)
+);

migrations/015_add_lot_partnumbers.sql

@@ -0,0 +1,7 @@
+CREATE TABLE IF NOT EXISTS lot_partnumbers (
+    partnumber VARCHAR(255) NOT NULL,
+    lot_name VARCHAR(255) NOT NULL DEFAULT '',
+    description VARCHAR(10000) NULL,
+    PRIMARY KEY (partnumber, lot_name),
+    INDEX idx_lot_partnumbers_lot_name (lot_name)
+);

migrations/016_add_price_level_pricelist_bindings.sql

@@ -0,0 +1,25 @@
+-- Add per-source pricelist bindings for configurations
+ALTER TABLE qt_configurations
+    ADD COLUMN IF NOT EXISTS warehouse_pricelist_id BIGINT UNSIGNED NULL AFTER pricelist_id,
+    ADD COLUMN IF NOT EXISTS competitor_pricelist_id BIGINT UNSIGNED NULL AFTER warehouse_pricelist_id,
+    ADD COLUMN IF NOT EXISTS disable_price_refresh BOOLEAN NOT NULL DEFAULT FALSE AFTER competitor_pricelist_id;
+
+ALTER TABLE qt_configurations
+    ADD INDEX IF NOT EXISTS idx_qt_configurations_warehouse_pricelist_id (warehouse_pricelist_id),
+    ADD INDEX IF NOT EXISTS idx_qt_configurations_competitor_pricelist_id (competitor_pricelist_id);
+
+-- Optional FK bindings (safe if re-run due IF NOT EXISTS on columns/indexes)
+-- If your MariaDB version does not support IF NOT EXISTS for FK names, duplicate-FK errors are ignored by migration runner.
+ALTER TABLE qt_configurations
+    ADD CONSTRAINT fk_qt_configurations_warehouse_pricelist_id
+        FOREIGN KEY (warehouse_pricelist_id)
+        REFERENCES qt_pricelists(id)
+        ON DELETE RESTRICT
+        ON UPDATE CASCADE;
+
+ALTER TABLE qt_configurations
+    ADD CONSTRAINT fk_qt_configurations_competitor_pricelist_id
+        FOREIGN KEY (competitor_pricelist_id)
+        REFERENCES qt_pricelists(id)
+        ON DELETE RESTRICT
+        ON UPDATE CASCADE;

migrations/017_update_lot_partnumbers_for_placeholders.sql

@@ -0,0 +1,25 @@
+-- Allow placeholder mappings (partnumber without bound lot) and store import description.
+ALTER TABLE lot_partnumbers
+    ADD COLUMN IF NOT EXISTS description VARCHAR(10000) NULL AFTER lot_name;
+
+ALTER TABLE lot_partnumbers
+    MODIFY COLUMN lot_name VARCHAR(255) NOT NULL DEFAULT '';
+
+-- Drop FK on lot_name if it exists to allow unresolved placeholders.
+SET @lp_fk_name := (
+    SELECT kcu.CONSTRAINT_NAME
+    FROM information_schema.KEY_COLUMN_USAGE kcu
+    WHERE kcu.TABLE_SCHEMA = DATABASE()
+      AND kcu.TABLE_NAME = 'lot_partnumbers'
+      AND kcu.COLUMN_NAME = 'lot_name'
+      AND kcu.REFERENCED_TABLE_NAME IS NOT NULL
+    LIMIT 1
+);
+SET @lp_drop_fk_sql := IF(
+    @lp_fk_name IS NULL,
+    'SELECT 1',
+    CONCAT('ALTER TABLE lot_partnumbers DROP FOREIGN KEY `', @lp_fk_name, '`')
+);
+PREPARE lp_stmt FROM @lp_drop_fk_sql;
+EXECUTE lp_stmt;
+DEALLOCATE PREPARE lp_stmt;

migrations/018_add_stock_ignore_rules.sql

@@ -0,0 +1,10 @@
+CREATE TABLE IF NOT EXISTS stock_ignore_rules (
+    id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
+    target VARCHAR(20) NOT NULL,
+    match_type VARCHAR(20) NOT NULL,
+    pattern VARCHAR(500) NOT NULL,
+    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    PRIMARY KEY (id),
+    UNIQUE KEY uq_stock_ignore_rule (target, match_type, pattern),
+    KEY idx_stock_ignore_target (target)
+);

migrations/019_rename_stock_log_lot_to_partnumber.sql

@@ -0,0 +1,2 @@
+ALTER TABLE stock_log
+    CHANGE COLUMN lot partnumber VARCHAR(255) NOT NULL;

migrations/020_add_only_in_stock_to_configurations.sql

@@ -0,0 +1,3 @@
+-- Add only_in_stock toggle to configuration settings persisted in MariaDB.
+ALTER TABLE qt_configurations
+    ADD COLUMN IF NOT EXISTS only_in_stock BOOLEAN NOT NULL DEFAULT FALSE AFTER disable_price_refresh;

migrations/021_add_pricelist_items_pricelist_lot_index.sql

@@ -0,0 +1,19 @@
+-- Ensure fast lookup for /api/quote/price-levels batched queries:
+-- SELECT ... FROM qt_pricelist_items WHERE pricelist_id = ? AND lot_name IN (...)
+SET @has_idx := (
+    SELECT COUNT(1)
+    FROM information_schema.statistics
+    WHERE table_schema = DATABASE()
+      AND table_name = 'qt_pricelist_items'
+      AND index_name IN ('idx_qt_pricelist_items_pricelist_lot', 'idx_pricelist_lot')
+);
+
+SET @ddl := IF(
+    @has_idx = 0,
+    'ALTER TABLE qt_pricelist_items ADD INDEX idx_qt_pricelist_items_pricelist_lot (pricelist_id, lot_name)',
+    'SELECT ''idx_qt_pricelist_items_pricelist_lot already exists, skip'''
+);
+
+PREPARE stmt FROM @ddl;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;