I think you'd find that the SQL parser layer is "getting in the way", but on the whole that's effectively what something like LambdaMOO can be properly distille

I think you'd find that the SQL parser layer is "getting in the way", but on the whole that's effectively what something like LambdaMOO can be properly distilled to. It has in theory all the layers of a database. But because it was all written as hobby/student code it doesn't really do any of it all that systematically. But yes one approach could be to take something like Postgres and write an alternative stored procedure implementation, and give it access directly to the query execution later bypassing the SQL parser maybe.