Re: [GENERAL] Pg_catalog reference

[Vyacheslav Kalinin]

It is not possible to assign triggers to system tables hence it is
impossible to reference system table in FK constraint. Obviously, users that
don't exist in the database cannot modify anything, you can use
"session_user" and "current_user" functions for logging purposes, see
http://www.postgresql.org/docs/8.2/interactive/functions-info.html