Remove remaining JPA references
Fix Javadoc comments
Actually use the transactions
Fix missing attributes
Fix setting more than one filter
Correctly set the IDs on the entities
Fix loading entries per category
Fix feed deletion
Fix persisting the FeedUser when persisting a Feed
Fix loading by primary key
Fix NPE due to autoboxing
Allow method chaining for filters
Fix loading by primary key
Remove obsolete annotation
Verify that the data is stored correct
Fix remaining unit tests