news-bundle/src/Resources/contao/classes/News.php
public function purgeOldFeeds()
	{
		$arrFeeds = array();
		$objFeeds = NewsFeedModel::findAll();

		if ($objFeeds !== null)
		{
			while ($objFeeds->next())
			{
				$arrFeeds[] = $objFeeds->alias ?: 'news' . $objFeeds->id;
			}
		}

		return $arrFeeds;
	}
public function purgeOldFeeds()
	{
		$arrFeeds = array();
		$objFeeds = NewsFeedModel::findAll();

		if ($objFeeds !== null)
		{
			while ($objFeeds->next())
			{
				$arrFeeds[] = $objFeeds->alias ?: 'news' . $objFeeds->id;
			}
		}

		return $arrFeeds;
	}
Return the names of the existing feeds so they are not removed

@return array