Extension:SecurePoll/securepoll cookie match table

mysql> describe securepoll_cookie_match;
+--------------+---------------+------+-----+---------+----------------+
| Field        | Type          | Null | Key | Default | Extra          |
+--------------+---------------+------+-----+---------+----------------+
| cm_id        | int(11)       | NO   | PRI | NULL    | auto_increment |
| cm_election  | int(11)       | NO   |     | NULL    |                |
| cm_voter_1   | int(11)       | NO   | MUL | NULL    |                |
| cm_voter_2   | int(11)       | NO   | MUL | NULL    |                |
| cm_timestamp | varbinary(14) | NO   |     | NULL    |                |
+--------------+---------------+------+-----+---------+----------------+