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EDIT: Ignore this comment, I was mistaken

I don't believe that will ever happen due to the underlying Vitess tech [0] that PlanetScale uses

We are working on foreign key constraint support right now. :)

It's going to happen.

Very cool! I didn't know that was on the roadmap.

It's on the official Vitess roadmap, though you do have to search on this page for it https://vitess.io/docs/resources/roadmap/