Extension:Wikibase Client/wbc entity usage table

mysql> describe wbc_entity_usage;
+--------------+----------------+------+-----+---------+----------------+
| Field        | Type           | Null | Key | Default | Extra          |
+--------------+----------------+------+-----+---------+----------------+
| eu_row_id    | bigint(20)     | NO   | PRI | NULL    | auto_increment |
| eu_entity_id | varbinary(255) | NO   | MUL | NULL    |                |
| eu_aspect    | varbinary(37)  | NO   |     | NULL    |                |
| eu_page_id   | int(11)        | NO   | MUL | NULL    |                |
+--------------+----------------+------+-----+---------+----------------+