pg_user_mapping

The pg_user_mapping catalog table stores the mappings from local users to remote users. You must have administrator privileges to view this catalog.

column	type	references	description
umuser	oid	pg_authid.oid	OID of the local role being mapped, 0 if the user mapping is public
umserver	oid	pg_foreign_server.oid	The OID of the foreign server that contains this mapping
umoptions	text [ ]		User mapping specific options, as "keyword=value" strings.

Parent topic: System Catalogs Definitions