Manual:Change tag table

The change_tag table tracks tags for revisions, logs and recent changes.

+---+--+--+-+-+---+ +---+--+--+-+-+---+ +---+--+--+-+-+---+
 * Field    | Type         | Null | Key | Default | Extra |
 * ct_rc_id | int(11)      | YES  | MUL | NULL    |       |
 * ct_log_id | int(11)     | YES  | MUL | NULL    |       |
 * ct_rev_id | int(11)     | YES  | MUL | NULL    |       |
 * ct_tag   | varchar(255) | NO   | MUL | NULL    |       |
 * ct_params | blob        | YES  |     | NULL    |       |