fix comments

lib/data/dao/group_dao.dart

@@ -3,6 +3,7 @@ import 'package:tallee/data/db/database.dart';
 import 'package:tallee/data/db/tables/group_table.dart';
 import 'package:tallee/data/db/tables/player_group_table.dart';
 import 'package:tallee/data/dto/group.dart';
+import 'package:tallee/data/dto/match.dart';
 import 'package:tallee/data/dto/player.dart';
 
 part 'group_dao.g.dart';
@@ -171,6 +172,12 @@ class GroupDao extends DatabaseAccessor<AppDatabase> with _$GroupDaoMixin {
     });
   }
 
+  /// Retrieves all matches associated with the given [groupId].
+  Future<List<Match>> getGroupMatches({required String groupId}) async {
+    final matches = await db.matchDao.getAllMatches();
+    return matches.where((match) => match.group?.id == groupId).toList();
+  }
+
   /// Deletes the group with the given [id] from the database.
   /// Returns `true` if more than 0 rows were affected, otherwise `false`.
   Future<bool> deleteGroup({required String groupId}) async {

lib/data/dao/match_dao.dart

@@ -338,10 +338,10 @@ class MatchDao extends DatabaseAccessor<AppDatabase> with _$MatchDaoMixin {
     return rowsAffected > 0;
   }
 
-  /// Entfernt die Gruppen-Verknüpfung des Matches mit der gegebenen [matchId].
-  /// Setzt die groupId auf null.
-  /// Gibt `true` zurück, wenn mehr als 0 Zeilen betroffen waren, ansonsten `false`.
-  Future<bool> deleteMatchGroup({required String matchId}) async {
+  /// Removes the group association of the match with the given [matchId].
+  /// Sets the groupId to null.
+  /// Returns `true` if more than 0 rows were affected, otherwise `false`.
+  Future<bool> removeMatchGroup({required String matchId}) async {
     final query = update(matchTable)..where((g) => g.id.equals(matchId));
     final rowsAffected = await query.write(
       const MatchTableCompanion(groupId: Value(null)),