Write New External Handler Driver
Implement Interface: Condorcet\DataManager\DataHandlerDrivers\DataHandlerDriverInterface
And read the relatively simple example: Condorcet\DataManager\DataHandlerDrivers\PdoHandlerDriver
Election->setExternalDataHandler()
$driver = new yourDriverClass (); // Must be ready to use (connection, access etc..)
$election->setExternalDataHandler($driver);