How to add aliases to iRedAdmin with Postgresql BackEnd ?

==== Required information ====
- iRedMail 0.8.4:
- Store mail accounts in which backend (PGSQL):
- Linux/BSD distribution name and version: Debian Wheezy 7.0
- Related log if you're reporting an issue:
====

There are tutos on how to deal with aliases for Mysql and Ldap, but i am using a postgresqlbackend for my iredadmin free mail server.

So please can anyone point me to a link or a post that show how to deal with the aliases on postgresql BacnEnd for iRedMail.

Thank you all !