diff --git a/lib/database/database.dart b/lib/database/database.dart
index 11301da..667b426 100644
--- a/lib/database/database.dart
+++ b/lib/database/database.dart
@@ -183,6 +183,12 @@ class AppDatabase extends _$AppDatabase {
     return changed == 1 || await getCloudOwnerUid(rideId) == normalizedUid;
   }
 
+  Future<int> clearCloudOwnerUid(String uid) async {
+    if (uid.trim().isEmpty) return 0;
+    return (update(rides)..where((r) => r.cloudOwnerUid.equals(uid.trim())))
+        .write(const RidesCompanion(cloudOwnerUid: Value(null)));
+  }
+
   Future<void> endRide(int rideId, RidesCompanion data) async {
     await (update(rides)..where((t) => t.id.equals(rideId))).write(data.copyWith(endTime: Value(DateTime.now())));
   }
diff --git a/test/auth_test.dart b/test/auth_test.dart
index ec4d96f..9b51a84 100644
--- a/test/auth_test.dart
+++ b/test/auth_test.dart
@@ -11,6 +11,11 @@ import 'package:motorcycle_dash/services/auth/auth_providers.dart';
 
 /// In-memory Mock AuthService for unit testing without live network / Firebase credentials
 class FakeAuthService implements AuthService {
+  @override bool get isEmailVerified => false;
+  @override Future<void> sendEmailVerification() async {}
+  @override Future<void> reloadCurrentUser() async {}
+  @override Future<void> reauthenticate({String? password}) async {}
+  @override Future<void> deleteCurrentUser() async {}
   final _stateController = StreamController<AuthState>.broadcast();
   AuthState _currentState = const AuthState.unauthenticated(isFirebaseConfigured: true);
   bool _isConfigured = true;
diff --git a/test/cloud_restore_manual_test.dart b/test/cloud_restore_manual_test.dart
index d1fe23d..5ec273d 100644
--- a/test/cloud_restore_manual_test.dart
+++ b/test/cloud_restore_manual_test.dart
@@ -19,6 +19,11 @@ import 'package:motorcycle_dash/services/sync/cloud_restore_service.dart';
 import 'package:motorcycle_dash/services/sync/r2_download_service.dart';
 
 class _TestAuthService implements AuthService {
+  @override bool get isEmailVerified => false;
+  @override Future<void> sendEmailVerification() async {}
+  @override Future<void> reloadCurrentUser() async {}
+  @override Future<void> reauthenticate({String? password}) async {}
+  @override Future<void> deleteCurrentUser() async {}
   AuthUser? _user;
   String? token = 'token';
   bool configured = true;
diff --git a/test/cloud_sync_hardening_test.dart b/test/cloud_sync_hardening_test.dart
index 29e0272..1398e6e 100644
--- a/test/cloud_sync_hardening_test.dart
+++ b/test/cloud_sync_hardening_test.dart
@@ -16,6 +16,11 @@ import 'package:motorcycle_dash/services/sync/sync_observer.dart';
 import 'package:motorcycle_dash/features/rides/ride_state_machine.dart';
 
 class TestMockAuthService implements AuthService {
+  @override bool get isEmailVerified => false;
+  @override Future<void> sendEmailVerification() async {}
+  @override Future<void> reloadCurrentUser() async {}
+  @override Future<void> reauthenticate({String? password}) async {}
+  @override Future<void> deleteCurrentUser() async {}
   AuthUser? _user;
   AuthState _state = const AuthState.unauthenticated();
 
diff --git a/test/firebase_sync_test.dart b/test/firebase_sync_test.dart
index 0db25c0..95d9260 100644
--- a/test/firebase_sync_test.dart
+++ b/test/firebase_sync_test.dart
@@ -23,6 +23,11 @@ import 'package:motorcycle_dash/services/sync/sync_outbox.dart';
 import 'package:motorcycle_dash/services/sync/sync_provider.dart';
 
 class MockAuthService implements AuthService {
+  @override bool get isEmailVerified => false;
+  @override Future<void> sendEmailVerification() async {}
+  @override Future<void> reloadCurrentUser() async {}
+  @override Future<void> reauthenticate({String? password}) async {}
+  @override Future<void> deleteCurrentUser() async {}
   AuthUser? _user;
   AuthState _state = const AuthState.unauthenticated();
 
diff --git a/test/ownership_isolation_test.dart b/test/ownership_isolation_test.dart
index 73e151a..bb61193 100644
--- a/test/ownership_isolation_test.dart
+++ b/test/ownership_isolation_test.dart
@@ -12,6 +12,11 @@ import 'package:motorcycle_dash/services/sync/sync_models.dart';
 import 'package:motorcycle_dash/services/sync/firebase_sync_provider.dart';
 
 class _Auth implements AuthService {
+  @override bool get isEmailVerified => false;
+  @override Future<void> sendEmailVerification() async {}
+  @override Future<void> reloadCurrentUser() async {}
+  @override Future<void> reauthenticate({String? password}) async {}
+  @override Future<void> deleteCurrentUser() async {}
   AuthUser? user;
   @override bool get isConfigured => true;
   @override AuthUser? get currentUser => user;
diff --git a/test/r2_security_audit_test.dart b/test/r2_security_audit_test.dart
index d855f6f..2304ddb 100644
--- a/test/r2_security_audit_test.dart
+++ b/test/r2_security_audit_test.dart
@@ -15,6 +15,11 @@ import 'package:motorcycle_dash/services/sync/sync_manager.dart';
 import 'package:motorcycle_dash/services/sync/sync_provider.dart';
 
 class MockSecurityAuthService implements AuthService {
+  @override bool get isEmailVerified => false;
+  @override Future<void> sendEmailVerification() async {}
+  @override Future<void> reloadCurrentUser() async {}
+  @override Future<void> reauthenticate({String? password}) async {}
+  @override Future<void> deleteCurrentUser() async {}
   AuthUser? _user;
   String? _token;