mass deletion of items

lib/services/dbhelper.dart

@@ -144,6 +144,10 @@ class DbHelper {
     await _client.from(itemsTableName).delete().eq('id', id);
   }
 
+  static Future<void> deleteItemsById(List<int> ids) async {
+    await _client.from(itemsTableName).delete().in_('id', ids);
+  }
+
   static Stream<AuthState> get authChangeEventStream =>
       _client.auth.onAuthStateChange;
 }