code: def delete_vpcid_for_switch(vpc_id, switch_ip):
      
  
      LOG.debug("delete_vpcid_for_switch called")
      session = bc.get_writer_session()
  
      vpc = _lookup_one_vpc_allocs(vpc_id=vpc_id,
                                   switch_ip=switch_ip,
                                   active=False)
      session.delete(vpc)
      session.flush()
docs: Removes unused vpcid for a switch.
  
      :param vpc_id: vpc id to remove
      :param switch_ip: ip address of the switch