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[Launchpad Bug Tracker <1496586@xxxxxxxxxxxxxxxxxx>]

[Expired for neutron because there has been no activity for 60 days.]

** Changed in: neutron
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1496586

Title:
  Avoid the pattern sql select/delete

Status in neutron:
  Expired

Bug description:
  The following pattern:

   obj = query.filter(...).one()
   context.session.delete(obj)

   is racy because obj can be deleted between the select and the delete,
  we should prefer when possible the pattern:

   count = query.filter(...).delete(synchronize_session=False)
   if not count:
     raise NotFound

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