public function up(Schema $schema)
{
$this->performDatabaseUpgrade();
$this->fixTree('PartCategory');
$this->fixTree('FootprintCategory');
$this->fixTree('StorageLocationCategory');
$this->createRootNode('partkeepr.part.category_service');
$this->createRootNode('partkeepr.storage_location.category_service');
$this->createRootNode('partkeepr.footprint.category_service');
}