Extension:Approved Revs/approved revs table

mysql> describe approved_revs;
+---------------+-----------+------+-----+---------+-------+
| Field         | Type      | Null | Key | Default | Extra |
+---------------+-----------+------+-----+---------+-------+
| page_id       | int(11)   | YES  | UNI | NULL    |       |
| rev_id        | int(11)   | YES  |     | NULL    |       |
| approver_id   | int(11)   | NO   |     | 0       |       |
| approval_date | timestamp | YES  |     | NULL    |       |
+---------------+-----------+------+-----+---------+-------+