Agree, Rust and Postgres and a perfect match. It feels so much more productive to write Postgres tooling in Rust. E.g. we already have extensions like pg_graphql[0], pg_jsonschema[1] and wrappers[2] which use pgrx. We don't have plrust on the platform yet though.
Full disclosure: I'm a Rust Engieer at Supabase.
[0] https://github.com/supabase/pg_graphql [1] https://github.com/supabase/pg_jsonschema [2] https://github.com/supabase/wrappers