create and update dao's

lib/data/dao/group_dao.dart

@@ -0,0 +1,30 @@
+import 'package:game_tracker/data/database.dart';
+import 'package:drift/drift.dart';
+
+extension GroupDao on AppDatabase {
+  Future<List<GroupTableData>> getAllGroups() async {
+    return await select(groupTable).get();
+  }
+
+  Future<GroupTableData> getGroupById(String id) async {
+    return await (select(
+      groupTable,
+    )..where((g) => g.id.equals(id))).getSingle();
+  }
+
+  Future<void> addGroup(String id, String name) async {
+    await into(
+      groupTable,
+    ).insert(GroupTableCompanion.insert(id: id, name: name));
+  }
+
+  Future<void> deleteGroup(String id) async {
+    await (delete(groupTable)..where((g) => g.id.equals(id))).go();
+  }
+
+  Future<void> updateGroupname(String id, String newName) async {
+    await (update(groupTable)..where((g) => g.id.equals(id))).write(
+      GroupTableCompanion(name: Value(newName)),
+    );
+  }
+}