async def METHOD_NAME(self):
    self._registered_keys = []
    try:
        payload = PayloadBuilder().SELECT("key").payload()
        results = await self._storage.query_tbl_with_payload('statistics', payload)
        for row in results['rows']:
            self._registered_keys.append(row['key'])
    except Exception as ex:
        _logger.exception(ex, 'Failed to retrieve statistics keys')