Background batch progress page

In background batch, it doesn't redirect to the http://example.com/batch?op=start&id=xxx page to view the progress, because the invoking for $redirect_callback is commented in background_batch.module.

Code snippet:

function background_batch_process_batch($redirect = NULL, $url = 'batch', $redirect_callback = 'drupal_goto') {
  $batch =& batch_get();

  drupal_theme_initialize();

  if (isset($batch)) {
    // Add process information
    $process_info = array(
      'current_set' => 0,
      'progressive' => TRUE,
      'url' => $url,
      'url_options' => array(),
      'source_url' => $_GET['q'],
      'redirect' => $redirect,
      'theme' => $GLOBALS['theme_key'],
      'redirect_callback' => $redirect_callback,
    );

    // ...Ignore...

    $batch += $process_info;
    // Redirect for processing.
    $function = $batch['redirect_callback'];
    if (function_exists($function)) {
      // $function($batch['url'], array('query' => array('op' => 'start', 'id' => $batch['id'])));
    }
  }
  background_process_start('_background_batch_process_callback', $batch);
}

I remove the comment in this line, $function($batch['url'], array('query' => array('op' => 'start', 'id' => $batch['id'])));. After calling background_batch_process_batch(), a user will be redirected to the http://example.com/batch?op=start&id=xxx and view the progress percentage. However, once the background batch process completes, the row of bid is deleted in batch table in database. It results that the pooling for progress gets 404 Not Found response and a user also sees an error message.

The error message:

An AJAX HTTP error occurred. HTTP Result Code: 404 Debugging information follows. Path: /batch?id=xxx&op=do StatusText: Not Found ResponseText: Page not found ...

Should it be saved the batch status in database for avoiding to the missing batch id?