Screenshot is from https://www.beeminder.com/mattepp/water
Note for future searchers:
At present, owing to technical limitations, you can’t retroratchet to 0 the day after a derailment.
The UI should display this consistently, of course, and not suggest a zero when it’s not possible!
I would really like to be able to retroratchet to 0 the day after derailment.
Any chance of this being made possible?