Optimize JPA Entity Definition

Avg Bid (USD)
Project Budget (USD)
$30 - $250

Project Description:
I need someone to redesign the JPA entity descriptions for a few classes I'm using with Google App Engine so they they use fewer writes, while still supporting the types of queries I need to be able to perform.

There are three basic classes:
- User (contains as uuid)
- Session (associated with user, contains a list of events)
- Event (associated with a user and session).

I've attached the classes as they are now. I suspect the Map are the issues.

Skills required:
Google App Engine, Java
Additional Files: CupidSession.java
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