Event::prepareData

private function prepareData(array $data = []): array
{
	$validFields = [
		'USER_ID',
		'GROUP_ID',
		'ROLE',
		'ROLE_OLD',
		'ROLE_NEW',
		'INITIATED_BY_TYPE',
		'RELATION_ID',
	];

	foreach ($data as $key => $row)
	{
		if (!in_array($key, $validFields, true))
		{
			unset($data[$key]);
		}
	}

	return $data;
}