def unregister_models(engine):
 models = (ArtifactDependency, ArtifactBlobLocation, ArtifactBlob, ArtifactProperty, ArtifactTag, Artifact)
 for model in models:
  model.metadata.drop_all(engine)

def unregister_models ( engine ) : models = ( ArtifactDependency , ArtifactBlobLocation , ArtifactBlob , ArtifactProperty , ArtifactTag , Artifact ) for model in models : model . metadata . drop_all ( engine )
unregister models .