Building object models around external data

I want to integrate external data into a Django app. Let's say, for example, I want to work with GitHub issues as if they were formulated as normal models within Django. So underneath these objects, I use the GitHub API to retrieve and store data.

In particular, I also want to be able to reference the GitHub issues from models but not the other way around. I.e., I don't intend to modify or extend the external data directly.

The views would use this abstraction to fetch data, but also to follow the references from "normal objects" to properties of the external data. Simple joins would also be nice to have, but clearly there would be limitations.

Are there any examples of how to achieve this in an idiomatic way?

Ideally, this would be would also be split in a general part that describes the API in general, and a descriptive part of the classes similar to how normal ORM classes are described.

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