I hit this recently as well when Supabase suddenly dropped IPv4 support.
socket_options: [:inet6] also didn’t work for me- no connection could be made.
this issue suggests that IPv6 support may actually just work out of the box.
My app works with just updating the database URL and not changing any other field. It seems my app takes longer to connect via the IPv6 address, so I had a number of errors with a Fly app that had min machines set to 0.
