Optimize automatic logging in
Optimize PersistenceManager
Tunnel query execution through the executeQuery(String) method
Always request username when selecting entries
Remove getLoginSession(String) and getLastActiveDate(String) methods
Remove unnecessary isRegistered() calls
Do not try to (un)serialize not registered players
Fix Polish INVALID_EMAIL_ADDRESS translation
Do not check in start() if storage type is valid

It will have already been validated by now.