Comment 5 for bug 488108

Free:

[4]

I'd be happy with "create" and "delete", and in fact, that would
match the hardware inventory plugin. Anyway, please do what you
feel is best, it was really just a minor suggestion.

[7]

I guess running queries that fail doesn't raise OperationalError and
so the transaction ends up getting committed...? Have you verified
that this code works with existing installations?