Is this project that is attempting to connect the database within the same project as the database?

Yes

Redis works fine, but postgres only with PUBLIC

Assuming it's the backend that's failing

hmm.

Is this the default Postgres template? Created by right click -> postgres?

yes it is. but maybe it's my application code? there is golang

maybe there is problem with ipv6 connection?

If it's the default template then it should be bound to IPv6 just fine

Can you screenshot the private networking settings under the postgres service?

that one?

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