Redmine

James,

wiki_pages does have a parent_id column. It was added in migration 95 for #528. Can you check if that migration was applied to your Redmine?

mysql> describe wiki_pages;
+------------+--------------+------+-----+---------+----------------+
| Field      | Type         | Null | Key | Default | Extra          |
+------------+--------------+------+-----+---------+----------------+
| id         | int(11)      | NO   | PRI | NULL    | auto_increment | 
| wiki_id    | int(11)      | NO   | MUL | NULL    |                | 
| title      | varchar(255) | NO   |     | NULL    |                | 
| created_on | datetime     | NO   |     | NULL    |                | 
| protected  | tinyint(1)   | NO   |     | 0       |                | 
| parent_id  | int(11)      | YES  | MUL | NULL    |                | 
+------------+--------------+------+-----+---------+----------------+
6 rows in set (0.00 sec)