Another persistence layer for Conductor server

[rpe4a]

Hello guys, can somebody give me a clue. I see in documentation that I need to implement these four interfaces or some of them to work with Spanner database. But I also see there that recent version of conductor has extra interfaces, for example:

com.netflix.conductor.dao.ConcurrentExecutionLimitDAO

com.netflix.conductor.dao.EventHandlerDAO

com.netflix.conductor.dao.PollDataDAO

com.netflix.conductor.dao.RateLimitingDAO

Should I implement them too? Or does it enough implement only the four ones from documentation link?