There’s a more idiomatic way of doing this part, as mentioned in this other, very recent forum thread:
Aside: As I understand it, you get Support as part of the Managed Postgres package. It would probably be better to use the dashboard portal, rather than posting here in the community forum. That way, your questions are formally lodged within their ticketing system, etc.
What’s included
[…]
Fly.io Support Portal to log tickets and get help