make_write_keys_zset_key doesnt check empty input

[leahtangmjpro]

Hi, I’m only using thread_id to create checkpoints. When I call the delete_thread method, I noticed that the zset keys aren’t being deleted. I think the issue might be that it doesn’t check for empty values when creating them.

def make_write_keys_zset_key(
        thread_id: str, checkpoint_ns: str, checkpoint_id: str
    ) -> str:
        """Create the key for the write keys sorted set for a specific checkpoint."""

        return REDIS_KEY_SEPARATOR.join(
            [WRITE_KEYS_ZSET_PREFIX, thread_id, checkpoint_ns, checkpoint_id]
        )

Additionally, I tried passing checkpoint_ns, but it always ends up as __empty__.
I’m using langgraph==0.6.8, and here’s the snippet I’m using:

config = RunnableConfig(
    configurable={"thread_id": thread_id, "checkpoint_ns": checkpoint_ns},
)
graph.invoke(state, config=config)

Thanks for your help.