See also: https://github.com/edwardspec/mediawiki-extension-DownloadBook/blob/master/sql/tables.json

MariaDB [wiki]> describe bookrenderingtask;
+-----------------+------------------+------+-----+---------+----------------+
| Field           | Type             | Null | Key | Default | Extra          |
+-----------------+------------------+------+-----+---------+----------------+
| brt_id          | int(10) unsigned | NO   | PRI | NULL    | auto_increment |
| brt_timestamp   | varbinary(14)    | NO   |     |         |                |
| brt_state       | varbinary(32)    | NO   |     | NULL    |                |
| brt_disposition | varbinary(255)   | YES  |     | NULL    |                |
| brt_stash_key   | varbinary(255)   | YES  |     | NULL    |                |
+-----------------+------------------+------+-----+---------+----------------+