you ran railway up while linked to postgres instead of your app's service.

and the password was set incorrectly.

I've gone ahead and redeployred postgres and set the password to what it should be, you are good to go.

So this requires for a reconfiguration in all of the documents, then

Was hoping this solution was not necessary

not sure what you mean?

What variables should I then use as the for the Postgres to communicate with backend?

DATABASE_URL

!s