fix: periodically execute pragma optimize (#28241)

Co-authored-by: shenlong-tanwen <139912620+shalong-tanwen@users.noreply.github.com>

mobile/lib/domain/services/background_worker.service.dart

@@ -176,15 +176,8 @@ class BackgroundWorkerBgService extends BackgroundWorkerFlutterApi {
       final backgroundSyncManager = _ref?.read(backgroundSyncProvider);
       final nativeSyncApi = _ref?.read(nativeSyncApiProvider);
 
-      await _drift.close();
-      await _driftLogger.close();
-
-      _ref?.dispose();
-      _ref = null;
-
-      _cancellationToken.complete();
       _logger.info("Cleaning up background worker");
-
+      _cancellationToken.complete();
       final cleanupFutures = [
         nativeSyncApi?.cancelHashing(),
         workerManagerPatch.dispose().catchError((_) async {
@@ -195,10 +188,15 @@ class BackgroundWorkerBgService extends BackgroundWorkerFlutterApi {
         Store.dispose(),
 
         backgroundSyncManager?.cancel(),
+        _drift.optimize(allTables: true),
       ];
 
       await Future.wait(cleanupFutures.nonNulls);
-      _logger.info("Background worker resources cleaned up");
+      await _drift.close();
+      await _driftLogger.close();
+
+      _ref?.dispose();
+      _ref = null;
     } catch (error, stack) {
       dPrint(() => 'Failed to cleanup background worker: $error with stack: $stack');
     }

mobile/lib/infrastructure/repositories/db.repository.dart

@@ -30,6 +30,7 @@ import 'package:immich_mobile/infrastructure/entities/user.entity.dart';
 import 'package:immich_mobile/infrastructure/entities/user_metadata.entity.dart';
 import 'package:immich_mobile/infrastructure/repositories/db.repository.drift.dart';
 import 'package:immich_mobile/infrastructure/repositories/db.repository.steps.dart';
+import 'package:logging/logging.dart';
 
 @DriftDatabase(
   tables: [
@@ -85,6 +86,17 @@ class Drift extends $Drift {
     });
   }
 
+  Future<void> optimize({bool allTables = false}) async {
+    try {
+      if (allTables) {
+        await customStatement('PRAGMA optimize=0x10002');
+      }
+      await customStatement('PRAGMA optimize');
+    } catch (error) {
+      Logger('Drift').fine('Failed to optimize database', error);
+    }
+  }
+
   @override
   int get schemaVersion => 25;
 
@@ -265,6 +277,7 @@ class Drift extends $Drift {
       }
 
       await customStatement('PRAGMA foreign_keys = ON;');
+      await optimize();
     },
     beforeOpen: (details) async {
       await customStatement('PRAGMA foreign_keys = ON');