PriceForge/bible-local/architecture.md

Architecture

Tech Stack

Component	Technology
Backend	Go 1.22+ (go.mod: 1.24.0)
Web framework	Gin
ORM	GORM
Database	MariaDB 11
Frontend	htmx + Tailwind CDN (no build step)
Excel	excelize
Go module	git.mchus.pro/mchus/priceforge

---

Directory Structure

PriceForge/
├── bible/                    # Architectural documentation (you are here)
├── bin/                      # Build output
├── cmd/
│   ├── pfs/                  # Main server (main.go ~749 lines)
│   ├── cron/                 # Cron job runner
│   ├── importer/             # Stock import utility
│   ├── migrate/              # Migration tool
│   └── migrate_ops_projects/ # Legacy project migrator
├── data/                     # Data files
├── internal/                 # Application code
│   ├── appmeta/              # Application metadata
│   ├── appstate/             # Global state
│   ├── config/               # YAML config loading
│   ├── db/                   # DB connection, connection pool
│   ├── dbutil/               # DB utilities
│   ├── handlers/             # HTTP handlers (12 files)
│   ├── localdb/              # SQLite for local settings
│   ├── lotmatch/             # LOT mapping resolver
│   ├── middleware/           # HTTP middleware
│   ├── models/               # GORM models and migrations
│   ├── repository/           # Data access layer (11 files)
│   ├── services/             # Business logic
│   │   ├── alerts/           # Alert service
│   │   ├── pricelist/        # Pricelist service
│   │   ├── pricing/          # Price calculation
│   │   ├── sync/             # Sync (4 files)
│   │   ├── stock_import.go   # Stock import: core, Import, replaceStockLogs
│   │   ├── stock_mappings.go # Stock import: mappings, ignore rules, seen-index
│   │   ├── stock_parse.go    # Stock import: XLSX/MXL parsing, date detection
│   │   ├── competitor_import.go # Competitor Excel import, pricelist build
│   │   ├── vendor_mapping.go # Vendor mapping service
│   │   └── component.go      # Component service
│   ├── tasks/                # Background Task Manager
│   └── warehouse/            # Warehouse price calculation
├── migrations/               # SQL migrations (39 files)
├── scripts/                  # Build and release scripts
├── web/
│   ├── static/
│   │   ├── app.css           # Tailwind CSS
│   │   └── js/               # Page JS (6 files, extracted from templates)
│   └── templates/            # HTML templates (shell only, JS in static/js/)
├── CLAUDE.md                 # AI agent instructions
├── README.md                 # Quick start
└── todo.md                   # Operational task list

---

Application Layers (3-tier)

HTTP Request
    │
    ▼
┌─────────────┐
│  Handlers   │  internal/handlers/   — request parsing, validation, response
└──────┬──────┘
       │
       ▼
┌─────────────┐
│  Services   │  internal/services/   — business logic, orchestration
└──────┬──────┘
       │
       ▼
┌─────────────┐
│ Repository  │  internal/repository/ — SQL queries via GORM
└──────┬──────┘
       │
       ▼
   MariaDB 11

---

Key Modules

internal/handlers/ (12 files)

File	Purpose
web.go	Page rendering
component.go	Component list and detail endpoints
pricing.go	PricingHandler struct, NewPricingHandler, stats, query helpers
pricing_components.go	ListComponents, GetComponentPricing, UpdatePrice, RecalculateAll, PreviewPrice
pricing_alerts.go	ListAlerts, AcknowledgeAlert, ResolveAlert, IgnoreAlert
pricing_stock.go	ImportStockLog, stock mappings, ignore rules
pricing_vendor.go	Vendor mappings CRUD, CSV import/export
pricing_lots.go	ListLotsTable, CreateLot, ListLots, GetLotStats, PartnumberBooks
pricelist.go	Pricelist CRUD and CSV export
competitor.go	Competitor CRUD, import, ParseHeaders
setup.go	DB connection setup and test
sync.go	Sync diagnostic endpoints

internal/services/

File/dir	Purpose
pricelist/	Create Estimate, Warehouse, Competitor pricelists
pricing/	Price calc: median, weighted_median, coefficients
alerts/	Alert generation (price staleness, demand)
stock_import.go	Stock import core: Import, replaceStockLogs, buildWarehousePricelistItems
stock_mappings.go	Mappings, ignore rules, seen-index (upsertSeenRows)
stock_parse.go	XLSX/MXL parsing, date detection, XLSX helper functions
competitor_import.go	Competitor Excel import, p/n→lot resolution, pricelist build
sync/service.go	Sync service struct, status, heartbeat
sync/sync_pricelists.go	Pricelist sync to local DB
sync/sync_changes.go	Push pending changes (configurations, projects)
sync/sync_import.go	Import configurations/projects to local DB
vendor_mapping.go	Resolve partnumber → LOT, bundles, ignore
component.go	Component listing and search

internal/warehouse/

snapshot.go — warehouse pricelist creation: weighted average, bundle expansion, allocation.

internal/lotmatch/

matcher.go — vendor partnumber → LOT resolver:

1. Exact match (vendor, partnumber)
2. Fallback: (vendor='', partnumber)

internal/tasks/

Task Manager: Submit, status polling, task types. See background-tasks.md.

---

HTML Templates (web/templates/)

Template	Route	Purpose
base.html	—	Layout, navigation
admin_pricing.html	/admin/pricing	Tabs: Estimate, Warehouse, Alerts
lot.html	/lot	Tabs: LOT components, Mappings
pricelists.html	/pricelists	Pricelist listing
pricelist_detail.html	/pricelists/:id	Pricelist detail view
vendor_mappings.html	/vendor-mappings	Vendor mapping UI
components_list.html	/partials/components	Components partial
setup.html	/setup	DB connection setup
sync_status.html	partial	Online/offline indicator

---

Navigation (base.html)

LOT              → /lot
Pricing Admin    → /admin/pricing
Settings         → /setup

Configurator, projects, and export links must not appear in the menu.

---

Database

• Primary: MariaDB 11 (all operational data)
• Local: SQLite (only app settings and technical data; not used in pfs runtime)
• Migrations: migrations/ — 25 SQL files, applied automatically on startup

Key Tables

Table	Purpose
lot	Components / articles (primary)
qt_lot_metadata	Component price metadata
qt_pricelist_items	Pricelist item rows
stock_log	Stock import data
qt_partnumber_book_items	Canonical PN catalog; one row per partnumber, with composition in lots_json
qt_partnumber_books	Versioned PN book headers with partnumbers_json membership
qt_vendor_partnumber_seen	Seen registry (unique by partnumber) + is_ignored flag

---

Startup Flow

1. Parse flags (--config, --migrate, --version)
2. Load config.yaml
3. Fail-fast: connect to MariaDB; exit on failure
4. Apply SQL migrations
5. Start Gin router on host:port
6. Auto-open browser (if loopback address)