Django Model Designer - UML

I am looking for a GUI tool for modeling Django model classes.

I have a pretty large app and I need to refactor it.
I used django-extensions and graph_models to dump the schema to the GraphViz dot file.
And I am stuck here :}

I would like to import either GraphViz dot file, or models source files, make changes and generate output Python+Django code.

Has anyone did something like that?

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