Can't delete and re-add pages

[RayYates]

Beta3 still exhibits this behavior.

Create a new page; delete the page; create the page again with the same code.

Runtime error in /mm5/5.00/features/tui/tui_db.mvc @ [00000038:0000004c]: Line 1479: MvQUERY: Inserted record violates UNIQUE constraint on index 's01_ManagedTemplates_2'