A play app to keep track of vehicle fuel use. I'm using it to learn Apple phone/watch interaction. All data is owned/persisted by the phone using SwiftData. SwiftData is used in a way that is not dependent upon SwiftUI.
Data flow between the watch and the companion app is described in comments at the top of the file named MessageKey.swift.
I don't pretend to know what I'm doing. The purpose of this app is as much for me to learn as it is to do something useful.