Just posting this here in case it helps anyone else in future.
mix ecto.create I was getting:
00:54:48.033 [error] GenServer #PID<0.214.0> terminating ** (Postgrex.Error) FATAL 28000 (invalid_authorization_specification) role "postgres" does not exist (db_connection) lib/db_connection/connection.ex:84: DBConnection.Connection.connect/2 (connection) lib/connection.ex:622: Connection.enter_connect/5 (stdlib) proc_lib.erl:249: :proc_lib.init_p_do_apply/3 Last message: nil State: Postgrex.Protocol ** (Mix) The database for Hello.Repo couldn't be created: killed
psql was reporting:
psql: FATAL: database "Aston" does not exist
See answer below…