Extension:CentralAuth/global user autocreate serial table
mysql> describe global_user_autocreate_serial; +--------------+-------------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +--------------+-------------------+------+-----+---------+-------+ | uas_shard | int(10) unsigned | NO | PRI | NULL | | | uas_year | smallint(5) | NO | PRI | NULL | | | uas_value | int(10) unsigned | NO | | NULL | | +--------------+-------------------+------+-----+---------+-------+