add alot

lib/services/settings_service.dart

@@ -0,0 +1,50 @@
+import 'package:drift/drift.dart';
+
+import '../database/app_database.dart';
+import '../models/settings.dart';
+
+abstract class SettingsService {
+  Future<AppSettings> getSettings();
+
+  Future<void> saveSettings(AppSettings settings);
+}
+
+class DriftSettingsService implements SettingsService {
+  final AppDatabase database;
+  static const _settingsId = 'app_settings';
+
+  DriftSettingsService({required this.database});
+
+  AppSettings _mapRowToSettings(AppSettingsRow row) {
+    return AppSettings(
+      pinRequired: row.pinRequired,
+      themeMode: AppThemeMode.values.firstWhere(
+            (mode) => mode.name == row.themeMode,
+        orElse: () => AppThemeMode.system,
+      ),
+    );
+  }
+
+  @override
+  Future<AppSettings> getSettings() async {
+    final query = database.select(database.appSettingsTable)
+      ..where((s) => s.id.equals(_settingsId));
+
+    final row = await query.getSingleOrNull();
+
+    if (row == null) return AppSettings.defaults;
+
+    return _mapRowToSettings(row);
+  }
+
+  @override
+  Future<void> saveSettings(AppSettings settings) async {
+    await database.into(database.appSettingsTable).insertOnConflictUpdate(
+      AppSettingsTableCompanion.insert(
+        id: _settingsId,
+        pinRequired: Value(settings.pinRequired),
+        themeMode: Value(settings.themeMode.name),
+      ),
+    );
+  }
+}