fix crash again

db/helpers.go

@@ -573,20 +573,29 @@ func ApplySQLiteTuning(ctx context.Context, dbConn *sqlx.DB) {
 	if strings.ToLower(dbConn.DriverName()) != "sqlite" {
 		return
 	}
-	// Best-effort pragmas; ignore errors to stay safe in constrained environments.
-	var err error
-	pragmas := []string{
-		`PRAGMA journal_mode=WAL;`,
-		`PRAGMA synchronous=NORMAL;`,
-		`PRAGMA temp_store=MEMORY;`,
-		`PRAGMA optimize;`,
-		`PRAGMA busy_timeout=5000;`,
+	if ctx == nil {
+		ctx = context.Background()
 	}
-	for _, pragma := range pragmas {
-		_, err = execLog(ctx, dbConn, pragma)
-		if logger, ok := ctx.Value("logger").(*slog.Logger); ok && logger != nil {
-			logger.Debug("Applied SQLite tuning pragma", "pragma", pragma, "error", err)
+	if err := ensureOncePerDB(dbConn, "sqlite_tuning_pragmas", func() error {
+		// Best-effort pragmas; keep this list lightweight to avoid long-running startup work.
+		// `PRAGMA optimize` is intentionally excluded from the hourly snapshot hot path.
+		pragmas := []string{
+			`PRAGMA journal_mode=WAL;`,
+			`PRAGMA synchronous=NORMAL;`,
+			`PRAGMA temp_store=MEMORY;`,
+			`PRAGMA busy_timeout=5000;`,
 		}
+		for _, pragma := range pragmas {
+			pragmaCtx, cancel := context.WithTimeout(ctx, 2*time.Second)
+			_, err := execLog(pragmaCtx, dbConn, pragma)
+			cancel()
+			if logger, ok := ctx.Value("logger").(*slog.Logger); ok && logger != nil {
+				logger.Debug("Applied SQLite tuning pragma", "pragma", pragma, "error", err)
+			}
+		}
+		return nil
+	}); err != nil {
+		slog.Warn("failed to apply SQLite tuning pragmas", "error", err)
 	}
 }