public function createSchedulingObject($principalUri, $objectUri, $objectData)
    {
        $stmt = $this->pdo->prepare('INSERT INTO '.$this->schedulingObjectTableName.' (principaluri, calendardata, uri, lastmodified, etag, size) VALUES (?, ?, ?, ?, ?, ?)');
        $stmt->execute([$principalUri, $objectData, $objectUri, time(), md5($objectData), strlen($objectData)]);
    }