feat(redis): add subscriber for pub/sub mode

app/service/daily_challenge.py

@@ -11,7 +11,6 @@ from app.log import logger
 from app.models.metadata_hub import DailyChallengeInfo
 from app.models.mods import APIMod
 from app.models.room import RoomCategory
-from app.signalr.hub import MetadataHubs
 
 from .room import create_playlist_room
 
@@ -44,6 +43,8 @@ async def create_daily_challenge_room(
 
 @get_scheduler().scheduled_job("cron", hour=0, minute=0, second=0, id="daily_challenge")
 async def daily_challenge_job():
+    from app.signalr.hub import MetadataHubs
+
     today = datetime.now(UTC).date()
     redis = get_redis()
     key = f"daily_challenge:{today.year}-{today.month}-{today.day}"