refactor: убрать qt_pricelist_sync_status, lot_log и лишние права БД

- Удалить все записи в qt_pricelist_sync_status (RecordSyncHeartbeat и
  ensureUserSyncStatusTable); ListUserSyncStatuses переведён на
  qt_client_schema_state
- Подавлять устаревший OFFLINE_UNVERIFIED_SCHEMA в UI когда соединение
  уже восстановлено
- Удалить все обращения к lot_log: repository/price.go, сортировка
  quote_count в component.go, UpdatePopularityScores в stats.go,
  модель LotLog

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

internal/services/sync/service.go

@@ -427,7 +427,6 @@ func (s *Service) SyncPricelists() (int, error) {
 	now := time.Now()
 	s.localDB.SetLastSyncTime(now)
 	s.recordPricelistSyncSuccess(now)
-	s.RecordSyncHeartbeat()
 	s.localDB.AppendSyncLog("pricelists", "ok", "", synced, plSyncStart, time.Since(plSyncStart).Milliseconds())
 
 	slog.Info("pricelist sync completed", "synced", synced, "total", len(serverPricelists))
@@ -612,58 +611,29 @@ func (s *Service) backfillUsedPricelistItemCategories(pricelistRepo *repository.
 	}
 }
 
-// RecordSyncHeartbeat updates shared sync heartbeat for current DB user.
-// Only users with write rights are expected to be able to update this table.
-func (s *Service) RecordSyncHeartbeat() {
-	username := strings.TrimSpace(s.localDB.GetDBUser())
-	if username == "" {
-		return
-	}
-
-	mariaDB, err := s.getDB()
-	if err != nil || mariaDB == nil {
-		return
-	}
-
-	if err := ensureUserSyncStatusTable(mariaDB); err != nil {
-		slog.Warn("sync heartbeat: failed to ensure table", "error", err)
-		return
-	}
-
-	now := time.Now().UTC()
-	if err := mariaDB.Exec(`
-		INSERT INTO qt_pricelist_sync_status (username, last_sync_at, updated_at, app_version)
-		VALUES (?, ?, ?, ?)
-		ON DUPLICATE KEY UPDATE
-			last_sync_at = VALUES(last_sync_at),
-			updated_at = VALUES(updated_at),
-			app_version = VALUES(app_version)
-	`, username, now, now, appmeta.Version()).Error; err != nil {
-		slog.Debug("sync heartbeat: skipped", "username", username, "error", err)
-	}
-}
-
-// ListUserSyncStatuses returns users who have recorded sync heartbeat.
+// ListUserSyncStatuses returns users who have recorded a client schema state check.
 func (s *Service) ListUserSyncStatuses(onlineThreshold time.Duration) ([]UserSyncStatus, error) {
 	mariaDB, err := s.getDB()
 	if err != nil || mariaDB == nil {
 		return nil, ErrOffline
 	}
 
-	if err := ensureUserSyncStatusTable(mariaDB); err != nil {
-		return nil, fmt.Errorf("ensure sync status table: %w", err)
-	}
-
 	type row struct {
-		Username   string    `gorm:"column:username"`
-		LastSyncAt time.Time `gorm:"column:last_sync_at"`
-		AppVersion string    `gorm:"column:app_version"`
+		Username      string    `gorm:"column:username"`
+		LastCheckedAt time.Time `gorm:"column:last_checked_at"`
+		AppVersion    string    `gorm:"column:app_version"`
 	}
 	var rows []row
 	if err := mariaDB.Raw(`
-		SELECT username, last_sync_at, COALESCE(app_version, '') AS app_version
-		FROM qt_pricelist_sync_status
-		ORDER BY last_sync_at DESC, username ASC
+		SELECT s.username, s.last_checked_at, COALESCE(s.app_version, '') AS app_version
+		FROM qt_client_schema_state s
+		INNER JOIN (
+			SELECT username, MAX(last_checked_at) AS max_checked
+			FROM qt_client_schema_state
+			GROUP BY username
+		) latest ON s.username = latest.username AND s.last_checked_at = latest.max_checked
+		GROUP BY s.username
+		ORDER BY s.last_checked_at DESC, s.username ASC
 	`).Scan(&rows).Error; err != nil {
 		return nil, fmt.Errorf("load sync status rows: %w", err)
 	}
@@ -683,7 +653,7 @@ func (s *Service) ListUserSyncStatuses(onlineThreshold time.Duration) ([]UserSyn
 			continue
 		}
 
-		isOnline := now.Sub(r.LastSyncAt) <= onlineThreshold
+		isOnline := now.Sub(r.LastCheckedAt) <= onlineThreshold
 		if _, connected := activeUsers[username]; connected {
 			isOnline = true
 			delete(activeUsers, username)
@@ -693,7 +663,7 @@ func (s *Service) ListUserSyncStatuses(onlineThreshold time.Duration) ([]UserSyn
 
 		result = append(result, UserSyncStatus{
 			Username:   username,
-			LastSyncAt: r.LastSyncAt,
+			LastSyncAt: r.LastCheckedAt,
 			AppVersion: appVersion,
 			IsOnline:   isOnline,
 		})
@@ -747,36 +717,6 @@ func (s *Service) listConnectedDBUsers(mariaDB *gorm.DB) (map[string]struct{}, e
 	return users, nil
 }
 
-func ensureUserSyncStatusTable(db *gorm.DB) error {
-	// Check if table exists instead of trying to create (avoids permission issues)
-	if !tableExists(db, "qt_pricelist_sync_status") {
-		if err := db.Exec(`
-			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)
-			)
-		`).Error; err != nil {
-			return fmt.Errorf("create qt_pricelist_sync_status table: %w", err)
-		}
-	}
-
-	// Backward compatibility for environments where table was created without app_version.
-	// Only try to add column if table exists.
-	if tableExists(db, "qt_pricelist_sync_status") {
-		if err := db.Exec(`
-			ALTER TABLE qt_pricelist_sync_status
-			ADD COLUMN IF NOT EXISTS app_version VARCHAR(64) NULL
-		`).Error; err != nil {
-			// Log but don't fail if alter fails (column might already exist)
-			slog.Debug("failed to add app_version column", "error", err)
-		}
-	}
-	return nil
-}
 
 // SyncPricelistItems synchronizes items for a specific pricelist
 func (s *Service) SyncPricelistItems(localPricelistID uint) (int, error) {

internal/services/sync/worker.go

@@ -100,8 +100,5 @@ func (w *Worker) runSync() {
 		return
 	}
 
-	// Mark user's sync heartbeat (used for online/offline status in UI).
-	w.service.RecordSyncHeartbeat()
-
 	w.logger.Info("background sync cycle completed")
 }