You can use Sorted Set in redis to get a TTL container with timestamp as score.
For example, whenever you insert a event string into the set you can set its score to the event time.
Thus you can get data of any time window by calling
zrangebyscore "your set name" min-time max-time
Moreover, we can do expire by using zremrangebyscore "your set name" min-time max-time to remove old events.
The only drawback here is you have to do housekeeping from an outsider process to maintain the size of the set.