Audit of creation or deletion of users

[Sunchaser]

Dear all,

Is Cognos auditing somewhere any information (date, who is doing the action) when a user is created or deleted. When I say "created or deleted",  I mean somebody adding a new entry in (for example) the Consumer group from the LDAP, or somebody deleting an entry from the Consumer group.

Any help / idea is welcomed, this is a "hot topic" for the moment for me. Or I'm currently thinking about adding my own audit table on database side, by adding a trigger on the table "cmobjprops33" that would store any modification in a custom table I would create.

Thanks!
Vinc