Does this work without an `--app sushi` flag? If you look at [what Heroku::Command::Pg is doing](https://github.com/heroku/heroku/blob/master/lib/heroku/command/pg.rb#L314-L317), it tries to reference the app but falls back to nil (so that the app name is determined from the `app::COLOR`-style identifier provided as an argument instead). Does that work here?