$schema = parent::getSharedTableFieldSchema($storage_definition, $table_name, $column_mapping);
$field_name = $storage_definition->getName();
- if ($table_name == 'aggregator_item') {
+ if ($table_name == $this->storage->getBaseTable()) {
switch ($field_name) {
case 'timestamp':
$this->addSharedTableFieldIndex($storage_definition, $schema, TRUE);