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    |       |