Find all active schedules and schedule celery tasks for
    each of them with a specific ETA (determined by parsing
    the cron schedule for the schedule)

def schedule_window(report_type, start_at, stop_at, resolution):
    """
    Find all active schedules and schedule celery tasks for
    each of them with a specific ETA (determined by parsing
    the cron schedule for the schedule)
    """
    model_cls = get_scheduler_model(report_type)
    dbsession = db.create_scoped_session()
    schedules = dbsession.query(model_cls).filter(model_cls.active.is_(True))

    for schedule in schedules:
        args = (
            report_type,
            schedule.id,
        )

        # Schedule the job for the specified time window
        for eta in next_schedules(schedule.crontab,
                                  start_at,
                                  stop_at,
                                  resolution=resolution):
            schedule_email_report.apply_async(args, eta=eta)