[kbd]

I take it it's because the migration files are auto-generated anyway, so it's odd to auto-format previously auto-generated files. You also don't really want to have repository churn on those files since they're generated once (and then never edited again) along with the feature they're for.

[QasimK]

It would be a one-time auto-format just like the one-time auto-format that black will do for the rest of the project. Any newly auto-generated files can be formatted before they are committed. So I don't see it actually adding to the harm.