protected function getProcessedFiles()
    {
        $sql = "SELECT * FROM `".$this->tableName."` ORDER BY `id` ASC;";
        try {
            $arrResult = $this->getAllRows();
        } catch (PDOException $ex) {
            echo $ex->getMessage().PHP_EOL;
            return;
        }
        
        foreach ($arrResult as $row) {
            $this->knownUpdateFiles[$row['id']] = $row['folder'].$row['name'];
        }
    }