Email bogdan.tsiganiyk@gmail.com and I will get back to you.
Quietkeep will not state a figure it cannot support. It needs at least three comparable observations before it will estimate anything, and it always tells you how many it used.
That number is an estimate rather than something you recorded. Anything without a tilde is a measurement you entered.
Deliberately. A low-energy day is the most useful thing Quietkeep can record, and penalising it would make the app worse at its job as well as unpleasant to use. Counts only ever go up.
No. Notifications are off until you turn them on, there is at most one a day, and there is never a notification because you have been away.
Yes — Settings has a CSV export of everything. It is free and always will be.
Email me. I will send you a code.