code: def refresh_token(self, subid):
      '''refresh or generate a new token for a user'''
      from expfactory.database.models import Participant
      p = Participant.query.filter(Participant.id == subid).first()
      if p is not None:
          p.token = str(uuid.uuid4())
      self.session.commit()
      return f refresh_token(self, subid):
      '''refresh or generate a new token for a user'''
      from expfactory.database.models import Participant
      p = Participant.query.filter(Participant.id == subid).first()
      if p is not None:
          p.token = str(uuid.uuid4())
      self.session.commit()
      return p
docs: refresh or generate a new token for a user