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"""Task Statistics."""
        allowed_dag_ids = get_airflow_app().appbuilder.sm.get_accessible_dag_ids(g.user)
        if not allowed_dag_ids:
            return flask.json.jsonify({})
        
        selected_dag_ids = {unquote(dag_id) for dag_id in request.form.getlist("dag_ids") if dag_id}
        if selected_dag_ids:
            filter_dag_ids = selected_dag_ids.intersection(allowed_dag_ids)
        else:
            filter_dag_ids = allowed_dag_ids
        running_dag_run_query_result = (
            select(DagRun.dag_id, DagRun.run_id)
            .join(DagModel, DagModel.dag_id == DagRun.dag_id)
            .where(DagRun.state == DagRunState.RUNNING, DagModel.is_active)
        )
        running_dag_run_query_result = running_dag_run_query_result.where(DagRun.dag_id.in_(filter_dag_ids))
        running_dag_run_query_result = running_dag_run_query_result.subquery("running_dag_run")
        
        running_task_instance_query_result = select(
            TaskInstance.dag_id.label("dag_id"),
            TaskInstance.state.label("state"),
            sqla.literal(True).label("is_dag_running"),
        ).join(
            running_dag_run_query_result,
            and_(
                running_dag_run_query_result.c.dag_id == TaskInstance.dag_id,
                running_dag_run_query_result.c.run_id == TaskInstance.run_id,
            ),
        )
        if conf.getboolean("webserver", "SHOW_RECENT_STATS_FOR_COMPLETED_RUNS", fallback=True):