wiki:CustomModel
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Note

The information on this page is obsolete and left here only for reference and has not been ported to the new documentation wiki.

As of TG 0.9a5 the default model was move to each project's model.py

So basically you can do anything with it as long as you maintain the relationships between the identity classes and set them in the config file, on the identity section.

for historic references  http://nerd.newburyportion.com/2005/11/creating-your-own-identity-model