you dont need to do db edits for this.
the correct way to work around this is via the neutron api  

NEUTRON_API_URL=$(openstack endpoint list --service neutron --interface public -c URL -f value)
TOKEN=$(openstack token issue -c id -f value)
curl -X DELETE  -H "X-Auth-Token: $TOKEN" ${NEUTRON_API_URL}/v2.0/ports/${port uuid}/bindings/${inactive host name}

we likely can handel this in nova by catching the conflict and deleting and recreating the inactive port binding.

we have tempor...