diff --git a/mobile/lib/infrastructure/repositories/sync_stream.repository.dart b/mobile/lib/infrastructure/repositories/sync_stream.repository.dart
index 8e087f836f..59ab88609b 100644
--- a/mobile/lib/infrastructure/repositories/sync_stream.repository.dart
+++ b/mobile/lib/infrastructure/repositories/sync_stream.repository.dart
@@ -612,12 +612,15 @@ class SyncStreamRepository extends DriftDatabaseRepository {
 
         final validUsers = {currentUserId, ...partnerIds.nonNulls};
 
-        // Asset is not owned by the current user or any of their partners and is not part of any (shared) album
+        // Asset is not owned by the current user or any of their partners and is not part of any (shared) album or memory
         // Likely a stale asset that was previously shared but has been removed
         await _db.remoteAssetEntity.deleteWhere((asset) {
           return asset.ownerId.isNotIn(validUsers) &
               asset.id.isNotInQuery(
                 _db.remoteAlbumAssetEntity.selectOnly()..addColumns([_db.remoteAlbumAssetEntity.assetId]),
+              ) &
+              asset.id.isNotInQuery(
+                _db.memoryAssetEntity.selectOnly()..addColumns([_db.memoryAssetEntity.assetId]),
               );
         });
       });
diff --git a/mobile/test/infrastructure/repositories/sync_stream_prune_assets_test.dart b/mobile/test/infrastructure/repositories/sync_stream_prune_assets_test.dart
new file mode 100644
index 0000000000..75908bb9a2
--- /dev/null
+++ b/mobile/test/infrastructure/repositories/sync_stream_prune_assets_test.dart
@@ -0,0 +1,266 @@
+import 'package:drift/native.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:immich_mobile/infrastructure/repositories/db.repository.dart';
+import 'package:immich_mobile/infrastructure/repositories/sync_stream.repository.dart';
+import 'package:openapi/api.dart';
+
+/// This test reproduces the bug where pruneAssets() deletes assets that are part of memories,
+/// causing foreign key constraint failures when trying to insert memory-asset relationships.
+void main() {
+  late DbRepository db;
+  late SyncStreamRepository sut;
+
+  setUp(() async {
+    db = DbRepository(NativeDatabase.memory());
+    sut = SyncStreamRepository(db);
+
+    // Set up test data: Create a user and a partner
+    await sut.updateAuthUsersV1([
+      SyncAuthUserV1(
+        email: 'current-user@test.com',
+        id: 'user-1',
+        isAdmin: false,
+        name: 'Current User',
+        avatarColor: null,
+        hasProfileImage: false,
+        profileChangedAt: DateTime(2025),
+      ),
+    ]);
+
+    await sut.updateUsersV1([
+      SyncUserV1(
+        deletedAt: null,
+        email: 'partner@test.com',
+        id: 'partner-1',
+        name: 'Partner User',
+        avatarColor: null,
+        hasProfileImage: false,
+        profileChangedAt: DateTime(2025),
+      ),
+    ]);
+
+    await sut.updatePartnerV1([
+      SyncPartnerV1(
+        inTimeline: true,
+        sharedById: 'partner-1',
+        sharedWithId: 'user-1',
+      ),
+    ]);
+  });
+
+  tearDown(() async {
+    await db.close();
+  });
+
+  group('pruneAssets - Memory Asset Bug', () {
+    test('BEFORE FIX: pruneAssets() should NOT delete assets that are part of memories', () async {
+      // Step 1: Create an asset owned by someone else (not current user or partner)
+      await sut.updateAssetsV1([
+        SyncAssetV1(
+          checksum: 'checksum-1'.codeUnits,
+          deletedAt: null,
+          deviceAssetId: 'device-1',
+          deviceId: 'device-1',
+          duplicateId: null,
+          duration: null,
+          fileCreatedAt: DateTime(2025, 1, 1),
+          fileModifiedAt: DateTime(2025, 1, 1),
+          id: 'asset-shared-memory',
+          isArchived: false,
+          isFavorite: false,
+          isOffline: false,
+          isTrashed: false,
+          libraryId: null,
+          livePhotoVideoId: null,
+          localDateTime: DateTime(2025, 1, 1),
+          originalFileName: 'shared-memory.jpg',
+          // Asset owned by someone else - should be pruned if not in album/memory
+          ownerId: 'other-user-not-partner',
+          resized: true,
+          stackId: null,
+          thumbhash: null,
+          type: AssetTypeEnum.IMAGE,
+          updatedAt: DateTime(2025, 1, 1),
+          visibility: AssetVisibility.public_,
+        ),
+      ]);
+
+      // Step 2: Create a memory owned by current user
+      await sut.updateMemoriesV1([
+        SyncMemoryV1(
+          createdAt: DateTime(2025, 1, 1),
+          data: {'year': 2025, 'title': 'Test Memory'},
+          deletedAt: null,
+          hideAt: null,
+          id: 'memory-1',
+          isSaved: false,
+          memoryAt: DateTime(2025, 1, 1),
+          ownerId: 'user-1',
+          seenAt: null,
+          showAt: DateTime(2025, 1, 1),
+          type: MemoryType.onThisDay,
+          updatedAt: DateTime(2025, 1, 1),
+        ),
+      ]);
+
+      // Step 3: Link the shared asset to the memory
+      await sut.updateMemoryAssetsV1([
+        SyncMemoryAssetV1(
+          assetId: 'asset-shared-memory',
+          memoryId: 'memory-1',
+        ),
+      ]);
+
+      // Verify the asset and memory-asset relationship exist
+      final assetsBefore = await db.remoteAssetEntity.select().get();
+      final memoryAssetsBefore = await db.memoryAssetEntity.select().get();
+      expect(assetsBefore.length, 1);
+      expect(assetsBefore.first.id, 'asset-shared-memory');
+      expect(memoryAssetsBefore.length, 1);
+
+      // Step 4: Call pruneAssets() - This is where the bug happens
+      await sut.pruneAssets();
+
+      // Step 5: Verify the asset is NOT deleted (because it's in a memory)
+      final assetsAfter = await db.remoteAssetEntity.select().get();
+      expect(
+        assetsAfter.length,
+        1,
+        reason: 'Asset should NOT be pruned because it is part of a memory',
+      );
+      expect(assetsAfter.first.id, 'asset-shared-memory');
+
+      // Step 6: Verify we can still work with memory-asset relationships
+      // This simulates receiving more sync events after pruning
+      await expectLater(
+        sut.updateMemoryAssetsV1([
+          SyncMemoryAssetV1(
+            assetId: 'asset-shared-memory',
+            memoryId: 'memory-1',
+          ),
+        ]),
+        completes,
+        reason: 'Should not throw foreign key constraint error',
+      );
+    });
+
+    test('pruneAssets() SHOULD delete assets not in albums or memories', () async {
+      // Step 1: Create an asset that's truly orphaned (not in album or memory)
+      await sut.updateAssetsV1([
+        SyncAssetV1(
+          checksum: 'checksum-2'.codeUnits,
+          deletedAt: null,
+          deviceAssetId: 'device-2',
+          deviceId: 'device-2',
+          duplicateId: null,
+          duration: null,
+          fileCreatedAt: DateTime(2025, 1, 1),
+          fileModifiedAt: DateTime(2025, 1, 1),
+          id: 'asset-orphaned',
+          isArchived: false,
+          isFavorite: false,
+          isOffline: false,
+          isTrashed: false,
+          libraryId: null,
+          livePhotoVideoId: null,
+          localDateTime: DateTime(2025, 1, 1),
+          originalFileName: 'orphaned.jpg',
+          ownerId: 'other-user-not-partner',
+          resized: true,
+          stackId: null,
+          thumbhash: null,
+          type: AssetTypeEnum.IMAGE,
+          updatedAt: DateTime(2025, 1, 1),
+          visibility: AssetVisibility.public_,
+        ),
+      ]);
+
+      // Verify the asset exists
+      final assetsBefore = await db.remoteAssetEntity.select().get();
+      expect(assetsBefore.length, 1);
+
+      // Call pruneAssets()
+      await sut.pruneAssets();
+
+      // Verify the orphaned asset IS deleted
+      final assetsAfter = await db.remoteAssetEntity.select().get();
+      expect(
+        assetsAfter.length,
+        0,
+        reason: 'Orphaned asset should be pruned',
+      );
+    });
+
+    test('pruneAssets() should NOT delete assets in albums', () async {
+      // Step 1: Create an asset and an album
+      await sut.updateAssetsV1([
+        SyncAssetV1(
+          checksum: 'checksum-3'.codeUnits,
+          deletedAt: null,
+          deviceAssetId: 'device-3',
+          deviceId: 'device-3',
+          duplicateId: null,
+          duration: null,
+          fileCreatedAt: DateTime(2025, 1, 1),
+          fileModifiedAt: DateTime(2025, 1, 1),
+          id: 'asset-in-album',
+          isArchived: false,
+          isFavorite: false,
+          isOffline: false,
+          isTrashed: false,
+          libraryId: null,
+          livePhotoVideoId: null,
+          localDateTime: DateTime(2025, 1, 1),
+          originalFileName: 'in-album.jpg',
+          ownerId: 'other-user-not-partner',
+          resized: true,
+          stackId: null,
+          thumbhash: null,
+          type: AssetTypeEnum.IMAGE,
+          updatedAt: DateTime(2025, 1, 1),
+          visibility: AssetVisibility.public_,
+        ),
+      ]);
+
+      await sut.updateAlbumsV1([
+        SyncAlbumV1(
+          albumName: 'Test Album',
+          albumThumbnailAssetId: null,
+          createdAt: DateTime(2025, 1, 1),
+          deletedAt: null,
+          description: 'Test',
+          id: 'album-1',
+          isActivityEnabled: false,
+          lastModifiedAssetTimestamp: DateTime(2025, 1, 1),
+          order: AlbumUserRole.editor,
+          ownerId: 'user-1',
+          startDate: DateTime(2025, 1, 1),
+          endDate: DateTime(2025, 1, 2),
+          updatedAt: DateTime(2025, 1, 1),
+        ),
+      ]);
+
+      await sut.updateAlbumToAssetsV1([
+        SyncAlbumToAssetV1(
+          albumId: 'album-1',
+          assetId: 'asset-in-album',
+        ),
+      ]);
+
+      // Verify setup
+      final assetsBefore = await db.remoteAssetEntity.select().get();
+      expect(assetsBefore.length, 1);
+
+      // Call pruneAssets()
+      await sut.pruneAssets();
+
+      // Verify asset is NOT deleted (protected by album membership)
+      final assetsAfter = await db.remoteAssetEntity.select().get();
+      expect(
+        assetsAfter.length,
+        1,
+        reason: 'Asset should NOT be pruned because it is in an album',
+      );
+    });
+  });
+}