I was about to reply with ‘i guess you will end up using spreadsheets’, until this comment loaded.

I’m actually working on software to do this, with metrics, but it’s far from ready for primetime. So this is not helping (only myself to see that there is interest 😏).

Easy solvable. Develop in strict mode with all notices enabled. Should be the default for any developer.

A faucet with a single knob for temperature instead of mixing them yourself. Many inner pieces are not cleanable and with calcium in the water they break easily.