Creating duplicate Zone in V2 API gives 500

2014-09-08 21:39:52.913 3116 TRACE designate.api.middleware Backend_Remote: Unknown backend failure: DBDuplicateEntry(u'(IntegrityError) (1062, "Duplicate entry \'i.io\' for key \'name\'") \'INSERT INTO domains (designate_id, name, master, type, account) VALUES (%s, %s, %s, %s, %s)\' (\'5952ef673dfe40b7aa7c1b2c2973f78a\', \'i.io\', \'ns10.io\', \'NATIVE\', \'3d8391080d4a4ec4b3eadf18e6b1539a\')',)
2014-09-08 21:39:52.913 3116 TRACE designate.api.middleware Traceback (most recent call last):
2014-09-08 21:39:52.913 3116 TRACE designate.api.middleware
2014-09-08 21:39:52.913 3116 TRACE designate.api.middleware File "/home/karlsone/projects/dnsaas/designate/.venv/local/lib/python2.7/site-packages/oslo/messaging/rpc/dispatcher.py", line 134, in _dispatch_and_reply
2014-09-08 21:39:52.913 3116 TRACE designate.api.middleware incoming.message))
2014-09-08 21:39:52.913 3116 TRACE designate.api.middleware
2014-09-08 21:39:52.913 3116 TRACE designate.api.middleware File "/home/karlsone/projects/dnsaas/designate/designate/rpc.py", line 178, in _dispatch
2014-09-08 21:39:52.913 3116 TRACE designate.api.middleware return super(RPCDispatcher, self)._dispatch(ctxt, message)
2014-09-08 21:39:52.913 3116 TRACE designate.api.middleware
2014-09-08 21:39:52.913 3116 TRACE designate.api.middleware File "/home/karlsone/projects/dnsaas/designate/.venv/local/lib/python2.7/site-packages/oslo/messaging/rpc/dispatcher.py", line 177, in _dispatch
2014-09-08 21:39:52.913 3116 TRACE designate.api.middleware return self._do_dispatch(endpoint, method, ctxt, args)
2014-09-08 21:39:52.913 3116 TRACE designate.api.middleware
2014-09-08 21:39:52.913 3116 TRACE designate.api.middleware File "/home/karlsone/projects/dnsaas/designate/.venv/local/lib/python2.7/site-packages/oslo/messaging/rpc/dispatcher.py", line 123, in _do_dispatch
2014-09-08 21:39:52.913 3116 TRACE designate.api.middleware result = getattr(endpoint, method)(ctxt, **new_args)
2014-09-08 21:39:52.913 3116 TRACE designate.api.middleware
2014-09-08 21:39:52.913 3116 TRACE designate.api.middleware File "/home/karlsone/projects/dnsaas/designate/designate/central/service.py", line 65, in wrapper
2014-09-08 21:39:52.913 3116 TRACE designate.api.middleware self.storage.rollback()
2014-09-08 21:39:52.913 3116 TRACE designate.api.middleware
2014-09-08 21:39:52.913 3116 TRACE designate.api.middleware File "/home/karlsone/projects/dnsaas/designate/designate/openstack/common/excutils.py", line 82, in __exit__
2014-09-08 21:39:52.913 3116 TRACE designate.api.middleware six.reraise(self.type_, self.value, self.tb)
2014-09-08 21:39:52.913 3116 TRACE designate.api.middleware
2014-09-08 21:39:52.913 3116 TRACE designate.api.middleware File "/home/karlsone/projects/dnsaas/designate/designate/central/service.py", line 62, in wrapper
2014-09-08 21:39:52.913 3116 TRACE designate.api.middleware result = f(self, *args, **kwargs)
2014-09-08 21:39:52.913 3116 TRACE designate.api.middleware
2014-09-08 21:39:52.913 3116 TRACE designate.api.middleware File "/home/karlsone/projects/dnsaas/designate/designate/central/service.py", line 768, in create_domain
2014-09-08 21:39:52.913 3116 TRACE designate.api.middleware self.backend.create_domain(context, created_domain)
2014-09-08 21:39:52.913 3116 TRACE designate.api.middleware
2014-09-08 21:39:52.913 3116 TRACE designate.api.middleware File "/usr/lib/python2.7/contextlib.py", line 35, in __exit__
2014-09-08 21:39:52.913 3116 TRACE designate.api.middleware self.gen.throw(type, value, traceback)
2014-09-08 21:39:52.913 3116 TRACE designate.api.middleware
2014-09-08 21:39:52.913 3116 TRACE designate.api.middleware File "/home/karlsone/projects/dnsaas/designate/designate/central/service.py", line 53, in wrap_backend_call
2014-09-08 21:39:52.913 3116 TRACE designate.api.middleware raise exceptions.Backend('Unknown backend failure: %r' % exc)
2014-09-08 21:39:52.913 3116 TRACE designate.api.middleware
2014-09-08 21:39:52.913 3116 TRACE designate.api.middleware Backend: Unknown backend failure: DBDuplicateEntry(u'(IntegrityError) (1062, "Duplicate entry \'i.io\' for key \'name\'") \'INSERT INTO domains (designate_id, name, master, type, account) VALUES (%s, %s, %s, %s, %s)\' (\'5952ef673dfe40b7aa7c1b2c2973f78a\', \'i.io\', \'ns10.io\', \'NATIVE\', \'3d8391080d4a4ec4b3eadf18e6b1539a\')',)
2014-09-08 21:39:52.913 3116 TRACE designate.api.middleware