This is awesome! I remember playing with Hasura (which uses Postgres) a few years ago. Hasura is great but one of the things I really wanted was JSON schema validation at a database level so I could keep all the "raw" types together if that makes sense. I was then, and do now, do public-facing schema validation but that doesn't necessarily validate how it's going to be persisted into the database so being able to have that closer to the database level now is great.