SystemLog::deleteByEntity

static function deleteByEntity($entityId, $entityType)
{
	$match = static::find(array(
		'filter' => array(
			'=ENTITY_ID' => $entityId,
			'=ENTITY_TYPE' => $entityType
		),
		'select' => array(
			'ID'
		)
	));
	foreach($match as $item)
	{
		$item->delete();
	}
}