class RedisVLMessageStore(ChatMessageStoreProtocol):
    def __init__(
        self,
        thread_id: str = "common_thread",
        top_k: int = 6,
        session_tag: str | None = None,
        redis_url: str | None = "redis://localhost:6379",
    ):
        self._thread_id = thread_id
        self._top_k = top_k
        self._session_tag = session_tag or f"session_{uuid4()}"
        self._redis_url = redis_url
        self._init_message_history()