Purpose

If you'd like to remove page level permissions for a specific page via the database

Solution

1. Shutdown Confluence
2. Backup your database

3. Run below queries to replacing  page title and the spaceid   you'd like to have the permissions removed from:
   

   Always back up your data before performing any modifications to the database. If possible, test any alter, insert, update, or delete SQL commands on a staging server first.

   
   

   DELETE from CONTENT_PERM WHERE CPS_ID IN (select ID from CONTENT_PERM_SET WHERE CONTENT_ID IN (select CONTENTID from CONTENT where title='page title' and spaceid = 'spaceid where the page is housed'));

   DELETE from CONTENT_PERM_SET WHERE CONTENT_ID IN (select CONTENTID from CONTENT WHERE title='page title' and spaceid = 'spaceid where the page is housed');

4. Start Confluence

DELETE from CONTENT_PERM WHERE CPS_ID IN (select ID from CONTENT_PERM_SET WHERE CONTENT_ID IN (select CONTENTID from CONTENT where title='Restrict' and spaceid = 'spaceid where the page is housed')) AND username = (select user_key from user_mapping where lower_username='test');