code: func FlushDeviceQueueForDevEUI(db sqlx.Execer, devEUI lorawan.EUI64) error {
  	_, err := db.Exec("delete from device_queue where dev_eui = $1", devEUI[:])
  	if err != nil {
  		return handlePSQLError(err, "delete error")
  	}
  
  	log.WithFields(log.Fields{
  		"dev_eui": devEUI,
  	}).Info("device-queue flushed")
  
  	return nil
  }
docs: // FlushDeviceQueueForDevEUI deletes all device-queue items for the given DevEUI.