Postgres support is not updated anymore. If you need postgres you’ll need to send pr to support the latest lts.
Any database that’ll be added by copying postgres code will be exact maintenance overhead like postgres.
Every hacker in the community has a setup that was partly converted to oracle. It’s given up on after realising it is just copy-pasting code and renaming imports. It’ll only add code that’ll never be maintained in future.
No official app is made using postgres.