def resolve_unclaimed(self):
        rec = self.db.one("""
            SELECT platform, user_name
              FROM elsewhere
             WHERE participant = %s
        """, (self.username,))
        return rec and '/on/%s/%s/' % (rec.platform, rec.user_name)
Update PD on receiving SIGUSR1.
dataset/ETHPy150Open gratipay/gratipay.com/gratipay/models/participant.py/Participant.resolve_unclaimed--crossover with--dataset/ETHPy150Open openstack/neutron/neutron/agent/linux/pd.py/PrefixDelegation._handle_sigusr1