Both AR- and AF-based objects need to be monkeypatched.  It does look like these two modules could inherit from another to reduce duplication, though there are subtle differences between them. Perhaps we could punt on this specific change and create a new issue for:

1. Refactoring/unifying what's in the redis.rb files to the extent that makes sense
2. Adding the `#since` method for pulling back events since a given date/time
3. Making this file use the `#since` method

Thoughts?