[Dovecot] Quota with Dict + SQL not updating

[Michael]

Hello all,

I have a Dovecot server deployed with a MySQL back end.

If the user logs in and there is no quota set for them in table 'quota', the 
system will automatically inset a line with their username and current 
messages/storage.

However after this it fails to update the information when to reflect new 
messages coming to their inbox after the original insert of the information.

It will only update the information when a user deletes a message.

Why is it not updating this information every time their mail is checked with 
IMAP?

Cheers,

Michael