Add "disablesieve" to mail_user table
When using dovecot and it's managesieve service ( for use with other mail filter applications such as horde webmail ), you cannot save the filters using the default settings, because dovecot has
"AND disable%Ln = n"
in this auth config, and mail_user table does not have "disablesieve" field, thus the query fails. This is concerning people ( like me ) who don't want to put limits on the mail filters and are allowing people to add/edit/delete mail filters through external programs.