title: Is there a keyspace event in redis for a key entering the database that isn't already present?
body: <p>I have a program that utilizes a redis key with an expire time set. I want to detect when there is a new entry to the data set. I can tell when there is a removal by listening for the "expired" event, but the "set" and "expire" events are fired every time the key is set, even if it's already in the database.</p>
  
  <p>Is there a keyspace event for a NEW key appearing?</p>