title: Redis streams - remove / expire events based on time
body: <p>I am playing with redis stream and it is good so far.
  I am trying to understand if there is anyway for me to expire the old events based on time or some other way. 
  I know that we can remove by event id. But I do not want to remember / store the event id which is difficult. Instead I am looking for a way remove the last 10K events or something like that.</p>