[Redis] Improve session cleanup with keyspace notifications

I am implementing session management in redis and trying to decide on the best way to handle cleanup of expired sessions. The structure I currently use is simple. Each session is stored as a key with ttl and the user also has a record containing all their session ids. For example session:session_id stores json session data with ttl and sess_records:account_id stores a set of session ids for that user. Authentication is straightforward because every request only needs to read session:session_id and does not require querying the database.The issue appears when a session expires. Redis removes the session key automatically because of ttl but the session id can still remain inside the user's set since sets do not know when related keys expire. Over time this can leave dangling session ids inside the set. I am considering two approaches. One option is to store sessions in a sorted set where the score is the expiration timestamp. In that case cleanup becomes deterministic because I can periodically run zremrangebyscore sess_records:account_id 0 now to remove expired entries. The other option is to enable redis keyspace notifications for expired events and subscribe to expiration events so when session:session_id expires I immediately remove that id from the corresponding user set. Which approach is usually better for this kind of session cleanup ?