back fix

mnemo_cards_backend/lib/database/daos/mixins/soft_delete_mixin.dart

@@ -1,5 +1,4 @@
 import 'package:drift/drift.dart';
-import 'package:drift_postgres/drift_postgres.dart';
 import 'package:mnemo_cards_backend/database/database.dart';
 
 /// Миксин для добавления soft delete функциональности в DAO
@@ -45,10 +44,14 @@ mixin SoftDeleteMixin<T extends Table, D> on DatabaseAccessor<AppDatabase> {
   ///
   /// Возвращает null если запись не найдена или удалена.
   Future<D?> getActiveById(String id) async {
-    return (selectActive()..where((t) {
+    final query = selectActive()
+      ..where((t) {
         final idColumn = (t as dynamic).id;
         return idColumn.equals(id);
-        }))
-        .getSingleOrNull();
+      })
+      ..limit(1);
+
+    final results = await query.get();
+    return results.isNotEmpty ? results.first : null;
   }
 }

mnemo_cards_backend/lib/database/daos/user_dao.dart

@@ -23,11 +23,13 @@ class UserDao extends DatabaseAccessor<AppDatabase> with _$UserDaoMixin {
   Future<UserWithData?> getUserWithDataById(String id) async {
     final query = select(users).join([
       leftOuterJoin(userDatas, userDatas.userId.equalsExp(users.id)),
-    ])..where(users.id.equals(id));
+    ])..where(users.id.equals(id))
+      ..limit(1);
 
-    final result = await query.getSingleOrNull();
-    if (result == null) return null;
+    final results = await query.get();
+    if (results.isEmpty) return null;
 
+    final result = results.first;
     return UserWithData(
       user: result.readTable(users),
       userData: result.readTableOrNull(userDatas),
@@ -183,16 +185,18 @@ class UserDao extends DatabaseAccessor<AppDatabase> with _$UserDaoMixin {
   }
 
   /// Получить токен по externalUserId (только активные)
-  Future<Token?> getTokenByExternalUserId(String externalUserId) {
-    return (select(tokens)
+  Future<Token?> getTokenByExternalUserId(String externalUserId) async {
+    final query = select(tokens)
       ..where(
         (t) =>
             t.externalUserId.equals(externalUserId) &
             t.isDeleted.equals(false),
       )
       ..orderBy([(t) => OrderingTerm.desc(t.created)])
-          ..limit(1))
-        .getSingleOrNull();
+      ..limit(1);
+
+    final results = await query.get();
+    return results.isNotEmpty ? results.first : null;
   }
 
   /// Получить токен пользователя (только активные)