test use_detector

        if self.use_detector:

            # generate DAG messages via obs_id-detector

            for this_rec in recs.data:

            for i_rec, this_rec in enumerate(recs.data):

                print(i_rec, this_rec, self.effective_detector_names)

                # filter level0 data records: detector in expected list

                if this_rec["detector"] in self.effective_detector_names:

                    # generate a DAG message if is_selected

                    this_dag_run = self.gen_dag_run(

                        dag_group_run=dag_group_run,