I’ve never seen pg_enquo before but from first skim it looks excellent. Since it’s built with Rust it should be able to run on RDS (in theory, now that AWS supports pl/Rust).

Also worth checking out this excellent extension which is a wrapper around libsodium:

https://github.com/michelp/pgsodium

We use it at Supabase to provide our in-database “Vault”:

https://supabase.com/blog/supabase-vault