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> but like for MySQL, PG, PlanetScale, or most DBs at scale, you shouldn't use them.

Tell that to the people who have been successfully building massive databases in RDBMS for decades making extensive use of FKs and FK constraints.

Neon is not a shared nothing architecture but shared storage. Makes it 100% compatible with Postgres that supports FK constraints since 1989

Also would be useful to add a disclaimer that you work for PlanetScale.

(And you work for neon)