feat: индикатор присутствия в конфигурациях (иконка глаза)

Открытые конфигурации фиксируются в локальном SQLite (app_settings) и
передаются на сервер через qt_client_schema_state.open_config_uuids при
каждом цикле синхронизации. Списки конфигураций обогащаются полем viewers,
в таблицах отображается иконка глаза с подсказкой при наличии других
пользователей, открывших эту конфигурацию.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

internal/services/sync/readiness.go

@@ -249,6 +249,13 @@ func (s *Service) reportClientSchemaState(mariaDB *gorm.DB, checkedAt time.Time)
 	pricelistItemsCount := s.localDB.CountAllPricelistItems()
 	componentsCount := s.localDB.CountComponents()
 	dbSizeBytes := s.localDB.DBFileSizeBytes()
+	openConfigUUIDs := s.localDB.GetOpenConfigUUIDs()
+	var openConfigUUIDsJSON *string
+	if len(openConfigUUIDs) > 0 {
+		raw, _ := json.Marshal(openConfigUUIDs)
+		s := string(raw)
+		openConfigUUIDsJSON = &s
+	}
 	return mariaDB.Exec(`
 		INSERT INTO qt_client_schema_state (
 			username, hostname, app_version,
@@ -257,9 +264,10 @@ func (s *Service) reportClientSchemaState(mariaDB *gorm.DB, checkedAt time.Time)
 			estimate_pricelist_version, warehouse_pricelist_version, competitor_pricelist_version,
 			last_sync_error_code, last_sync_error_text,
 			local_pricelist_count, pricelist_items_count, components_count, db_size_bytes,
+			open_config_uuids,
 			last_checked_at, updated_at
 		)
-		VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+		VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
 		ON DUPLICATE KEY UPDATE
 			app_version = VALUES(app_version),
 			last_sync_at = VALUES(last_sync_at),
@@ -277,6 +285,7 @@ func (s *Service) reportClientSchemaState(mariaDB *gorm.DB, checkedAt time.Time)
 			pricelist_items_count = VALUES(pricelist_items_count),
 			components_count = VALUES(components_count),
 			db_size_bytes = VALUES(db_size_bytes),
+			open_config_uuids = VALUES(open_config_uuids),
 			last_checked_at = VALUES(last_checked_at),
 			updated_at = VALUES(updated_at)
 	`, username, hostname, appmeta.Version(),
@@ -285,6 +294,7 @@ func (s *Service) reportClientSchemaState(mariaDB *gorm.DB, checkedAt time.Time)
 		estimateVersion, warehouseVersion, competitorVersion,
 		lastSyncErrorCode, lastSyncErrorText,
 		localPricelistCount, pricelistItemsCount, componentsCount, dbSizeBytes,
+		openConfigUUIDsJSON,
 		checkedAt, checkedAt).Error
 }
 

internal/services/sync/service.go

@@ -630,6 +630,56 @@ func (s *Service) backfillUsedPricelistItemCategories(pricelistRepo *repository.
 	}
 }
 
+// ListActiveViewersByConfigUUIDs returns a map of configUUID → []username for users
+// who currently have those configs open (based on the last two sync cycles).
+func (s *Service) ListActiveViewersByConfigUUIDs(uuids []string) (map[string][]string, error) {
+	if len(uuids) == 0 {
+		return map[string][]string{}, nil
+	}
+	mariaDB, err := s.getDB()
+	if err != nil || mariaDB == nil {
+		return map[string][]string{}, nil
+	}
+	selfUsername := strings.ToLower(strings.TrimSpace(s.localDB.GetDBUser()))
+
+	type row struct {
+		Username       string `gorm:"column:username"`
+		OpenConfigJSON string `gorm:"column:open_config_uuids"`
+	}
+	var rows []row
+	if err := mariaDB.Raw(`
+		SELECT username, open_config_uuids
+		FROM qt_client_schema_state
+		WHERE open_config_uuids IS NOT NULL
+		  AND open_config_uuids != '[]'
+		  AND last_checked_at > NOW() - INTERVAL 10 MINUTE
+	`).Scan(&rows).Error; err != nil {
+		return map[string][]string{}, nil
+	}
+
+	wantSet := make(map[string]struct{}, len(uuids))
+	for _, u := range uuids {
+		wantSet[u] = struct{}{}
+	}
+
+	result := make(map[string][]string)
+	for _, r := range rows {
+		if strings.ToLower(strings.TrimSpace(r.Username)) == selfUsername {
+			continue
+		}
+		var openUUIDs []string
+		if err := json.Unmarshal([]byte(r.OpenConfigJSON), &openUUIDs); err != nil {
+			continue
+		}
+		for _, ou := range openUUIDs {
+			if _, ok := wantSet[ou]; ok {
+				result[ou] = append(result[ou], r.Username)
+			}
+		}
+	}
+	return result, nil
+}
+
 // ListUserSyncStatuses returns users who have recorded a client schema state check.
 func (s *Service) ListUserSyncStatuses(onlineThreshold time.Duration) ([]UserSyncStatus, error) {
 	mariaDB, err := s.getDB()