[CalendarServer-users] How to delete user principals on calendarserver including all their calendars?

Hi, deleting the accounts from accounts.xml does not deletes their calendars in the database. The commands calendarserver_purge_principals and calendarserver_purge_events only erases the current, upcoming and old events from the calendars of the principal or events older than x days. So how to remove old users including their own calendars before remove them from accounts.xml Thanks in advance. Frank