Extension:CheckUser/cusi signal table

mysql> describe cusi_signal;
+------------+------------------+------+-----+---------+-------+
| Field      | Type             | Null | Key | Default | Extra |
+------------+------------------+------+-----+---------+-------+
| sis_sic_id | int(10) unsigned | NO   | PRI | NULL    |       |
| sis_name   | varbinary(255)   | NO   | PRI | NULL    |       |
| sis_value  | varbinary(255)   | NO   | PRI | NULL    |       |
+------------+------------------+------+-----+---------+-------+