Extension:CodeReview/code comment table

mysql> describe code_comment; +--++--+-+-++ +--++--+-+-++ +--++--+-+-++
 * Field       | Type           | Null | Key | Default | Extra          |
 * cc_id       | int(11)        | NO   | PRI | NULL    | auto_increment |
 * cc_repo_id  | int(11)        | NO   | MUL | NULL    |                |
 * cc_rev_id   | int(11)        | NO   |     | NULL    |                |
 * cc_text     | blob           | YES  |     | NULL    |                |
 * cc_parent   | int(11)        | YES  |     | NULL    |                |
 * cc_user     | int(11)        | NO   |     | NULL    |                |
 * cc_user_text | varbinary(255) | NO  |     | NULL    |                |
 * cc_timestamp | binary(14)    | NO   |     | NULL    |                |
 * cc_sortkey  | varbinary(255) | YES  |     | NULL    |                |