The other revision apps for django don't work well enough. NIH!

Sketch for history app

from django.db import models as m
from tesla.models import Invention

class _DUMMY(object): 
    pass

def get_model_dict(model):
    def get_foreign_key_key(model):
        return '%s_%s' % (
            model.__module__.replace('.models', '').replace('.', '_'),
            model.__class__.__name__.lower(),
        )
    def get_foreign_key_name(model):
        return '%s.%s' % (
            model.__module__.replace('.models', ''),
            model.__class__.__name__
        )
    modeldict = { 
        '__module__': _DUMMY.__module__ ,
        get_foreign_key_key(model): m.ForeignKey(get_foreign_key_name(model)),
    }
    for name in model._meta.get_all_field_names():
        field_object, _model, direct, m2m = model._meta.get_field_by_name(name)
        modeldict[name] = field_object
    
    return modeldict

def get_history_model_name(model):
    return '%s%s' % (
        "".join([p.capitalize() for p in model.__module__.split('.') if p != 'models']),
        model.__class__.__name__.capitalize()
    )

def build_class(name, bases, _dict):
    globals()[name] = type(name, bases, _dict)

model = Invention()
build_class(get_history_model_name(model), (m.Model, ), get_model_dict(model))