diff --git a/danding_bot/plugins/group_horse_racing/room_store.py b/danding_bot/plugins/group_horse_racing/room_store.py
index 1b51c20..906b19b 100644
--- a/danding_bot/plugins/group_horse_racing/room_store.py
+++ b/danding_bot/plugins/group_horse_racing/room_store.py
@@ -247,3 +247,7 @@ class RoomStore:
             json.dumps(getattr(result, 'odds_snapshot', {})),
         ))
         await db.commit()
+
+
+# Module-level singleton instance
+room_store = RoomStore(Config())