lib/data/dao/game_dao.dart

@@ -57,7 +57,7 @@ class GameDao extends DatabaseAccessor<AppDatabase> with _$GameDaoMixin {
         GameTableCompanion.insert(
           id: game.id,
           name: game.name,
-          winnerId: game.winner,
+          winnerId: Value(game.winner),
         ),
         mode: InsertMode.insertOrReplace,
       );

lib/data/dao/game_dao.g.dart

@@ -4,6 +4,5 @@ part of 'game_dao.dart';
 
 // ignore_for_file: type=lint
 mixin _$GameDaoMixin on DatabaseAccessor<AppDatabase> {
-  $PlayerTableTable get playerTable => attachedDatabase.playerTable;
   $GameTableTable get gameTable => attachedDatabase.gameTable;
 }

lib/data/dao/group_game_dao.g.dart

@@ -5,7 +5,6 @@ part of 'group_game_dao.dart';
 // ignore_for_file: type=lint
 mixin _$GroupGameDaoMixin on DatabaseAccessor<AppDatabase> {
   $GroupTableTable get groupTable => attachedDatabase.groupTable;
-  $PlayerTableTable get playerTable => attachedDatabase.playerTable;
   $GameTableTable get gameTable => attachedDatabase.gameTable;
   $GroupGameTableTable get groupGameTable => attachedDatabase.groupGameTable;
 }

lib/data/dto/game.dart

@@ -7,15 +7,10 @@ class Game {
   final String name;
   final List<Player>? players;
   final Group? group;
-  final String winner;
+  final String? winner;
 
-  Game({
-    String? id,
-    required this.name,
-    this.players,
-    this.group,
-    this.winner = '',
-  }) : id = id ?? const Uuid().v4();
+  Game({String? id, required this.name, this.players, this.group, this.winner})
+    : id = id ?? const Uuid().v4();
 
   @override
   String toString() {