Extension:CodeReview/code tags table

mysql> describe code_tags;
+------------+----------------+------+-----+---------+-------+
| Field      | Type           | Null | Key | Default | Extra |
+------------+----------------+------+-----+---------+-------+
| ct_repo_id | int(11)        | NO   | PRI | NULL    |       |
| ct_rev_id  | int(11)        | NO   | PRI | NULL    |       |
| ct_tag     | varbinary(255) | NO   | PRI | NULL    |       |
+------------+----------------+------+-----+---------+-------+