--- /dev/null
+<?php
+
+namespace Drupal\aggregator;
+
+use Drupal\Core\Entity\Sql\SqlContentEntityStorage;
+
+/**
+ * Controller class for aggregator's feeds.
+ *
+ * This extends the Drupal\Core\Entity\Sql\SqlContentEntityStorage class, adding
+ * required special handling for feed entities.
+ */
+class FeedStorage extends SqlContentEntityStorage implements FeedStorageInterface {
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getFeedIdsToRefresh() {
+ return $this->database->query('SELECT fid FROM {aggregator_feed} WHERE queued = 0 AND checked + refresh < :time AND refresh <> :never', [
+ ':time' => REQUEST_TIME,
+ ':never' => AGGREGATOR_CLEAR_NEVER,
+ ])->fetchCol();
+ }
+
+}