Extension:GlobalUserrights/global_user_groups table
mysql> describe global_user_groups; +------------+------------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +------------+------------------+------+-----+---------+-------+ | gug_user | int(10) unsigned | NO | PRI | 0 | | | gug_group | varbinary(255) | NO | PRI | | | | gug_expiry | varbinary(14) | YES | MUL | NULL | | +------------+------------------+------+-----+---------+-------+