Extension:CheckUser/cu changes table

mysql> describe cu_changes; ++-+--+-+-++ ++-+--+-+-++ ++-+--+-+-++
 * Field         | Type                | Null | Key | Default | Extra          |
 * cuc_id        | int(11)             | NO   | PRI | NULL    | auto_increment |
 * cuc_namespace | int(11)             | NO   |     | 0       |                |
 * cuc_title     | varchar(255)        | NO   |     |         |                |
 * cuc_user      | int(11)             | NO   | MUL | 0       |                |
 * cuc_user_text | varchar(255)        | NO   |     |         |                |
 * cuc_actiontext | varchar(255)       | NO   |     |         |                |
 * cuc_comment   | varchar(255)        | NO   |     |         |                |
 * cuc_minor     | tinyint(1)          | NO   |     | 0       |                |
 * cuc_page_id   | int(10) unsigned    | NO   |     | 0       |                |
 * cuc_this_oldid | int(10) unsigned   | NO   |     | 0       |                |
 * cuc_last_oldid | int(10) unsigned   | NO   |     | 0       |                |
 * cuc_type      | tinyint(3) unsigned | NO   |     | 0       |                |
 * cuc_timestamp | char(14)            | NO   | MUL |         |                |
 * cuc_ip        | varchar(255)        | YES  |     |         |                |
 * cuc_ip_hex    | varchar(255)        | YES  | MUL | NULL    |                |
 * cuc_xff       | varchar(255)        | YES  |     |         |                |
 * cuc_xff_hex   | varchar(255)        | YES  | MUL | NULL    |                |
 * cuc_agent     | varchar(255)        | YES  |     | NULL    |                |