If I were building a habit tracking app for iOS I wouldn't start from scratch. Even if I had a completely new take on the UI, I would try to reuse or adapt a data model from an existing app.

The easiest way to do that would be to clone the repo for the open source Loop habit tracker: https://github.com/iSoron/uhabits and then ask Claude Code to study the data model and API, and help me think through what I need to add/change to support the features I want.

Once the data model is in great shape, then let the AI go and build, test, iterate etc.