[Dovecot] Dovecot + virtual users

[bichumo]

Hi,

I'm running FreeBSD, Dovecot, Postfix (virtual users), MySQL, 
Squirrelmail. I have installed squirrelmail-quota_usage-plugin, but I 
cannot make it work. It mentions "If you have an IMAP server with QUOTA 
Extension capability...". In dovecot.conf I have enabled "mail_plugins = 
quota" near protocol pop3 and protocol lda, near protocol imap I have 
"mail_plugins = quota imap_quota". Near " plugin { ..." I have "quota = 
maildir:storage=204800". I think that the problem of why I don't see 
quota in Squirrelmail is in file dovecot-sql near user_query. I have my 
users mailboxes in such format: /usr/local/virtual/domain.tld/username 
and my user_query looks like this:
user_query = SELECT maildir, 125 AS uid, 125 AS gid, 
concat('maildir:storage=', quota) AS quota FROM mailbox WHERE username = 
'%u' AND active = '1', I think that in my user_query I'm missing 
something. I do not get any errors in the dovecot and dovecot-debug 
logs, everything works fine, but I still can't see quota.