[openstreetmap/openstreetmap-website] Models in migrations (#2320)

[Tom Hughes]

Frankly I'm astonished that those minimal models even work - some of our migrations do pretty extreme things and I'm surprised none of them are relying on the details of the models.

I rather suspect that maybe they only work with an empty database, and that some of the ones that try and mutate existing data might fail if there was any data to change?

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