Queue entries not deleted

The queue is propogated by SchoolTool and is retained by the ZODB. However, when any elements of the queue are deleted, that change is not logged in the ZODB.

>>> queue = openDb()['queue']
>>> queue
{'Hamburger': 'Foobar'}
>>> queue.clear()
>>> queue
{}
>>> transaction.commit()
>>> closeDb()
>>> queue = openDb()['queue']
>>> queue
{'Hamburger': 'Foobar'}