docs: def ReadChildFlowObjects(self, client_id, flow_id, cursor=None):
      """Reads flows that were started by a given flow from the database."""
      query = ("SELECT " + self.FLOW_DB_FIELDS +
               "FROM flows WHERE client_id=%s AND parent_flow_id=%s")
      cursor.execute(
          query,
          [db_utils.ClientIDToInt(client_id),
           db_utils.FlowIDToInt(flow_id)])
      return [self._FlowObjectFromRow(row) for row in cursor.fetchall()]