[firebird-support] Firing event when deleting in MON$ATTACHMENTS

[m_brahi...@yahoo.fr [firebird-support]]

Hello,

I am deleting user connected with:
 DELETE FROM MON$ATTACHMENTS WHERE MON$ATTACHMENT_ID = :ID_CONNECTION;

 I need to use POST_EVENT in order to notify user that he has been disconnected 
but don't found a trigger for MON$ATTACHMENTS to do it.  Can you please help me 
? 
Thanks