feat: full local assets / album sync

mobile-v2/lib/domain/entities/album.entity.dart

@@ -1,11 +1,21 @@
 import 'package:drift/drift.dart';
+import 'package:immich_mobile/domain/entities/asset.entity.dart';
 
-class LocalAlbum extends Table {
-  const LocalAlbum();
+class Album extends Table {
+  const Album();
 
   IntColumn get id => integer().autoIncrement()();
-  TextColumn get localId => text().unique()();
   TextColumn get name => text()();
   DateTimeColumn get modifiedTime =>
       dateTime().withDefault(currentDateAndTime)();
+
+  IntColumn get thumbnailAssetId => integer()
+      .references(Asset, #id, onDelete: KeyAction.setNull)
+      .nullable()();
+
+  // Local only
+  TextColumn get localId => text().nullable().unique()();
+
+  // Remote only
+  TextColumn get remoteId => text().nullable().unique()();
 }