A day of data - VitaSync

Everything you log hangs off one record per calendar day. A day holds only the metrics you logged. A person tracking sleep and spending has days with two values on them.

Blank is not zero

A metric you did not log is blank. VitaSync never writes a zero for you. Insights only use days with a value, so a skipped day does not drag an average down. One exception: a soreness check-in of 0 means you checked and were not sore. That zero is kept.

Some metrics are made of smaller pieces

Metric	Made of	The day’s value
Mood, energy, stress	Check-ins through the day, each with a time	The average of the check-ins
Deep Work, meditation	Timed sessions	The sessions added up
Food	Food items, each with a meal and a serving	Calories and macros added up
Workouts	Sessions, each with its sets	Listed, not added
Water	Taps and presets	Added up, in ml

Your reference data

Some things are not about one day. They describe you, and the days refer to them. Habits, supplements, custom metrics, workout templates, goals and reminders are kept once, not per day. Deleting a habit does not delete the days you ticked it on.

Where a value came from

Every value carries a tag: typed by you, or read from a source like Health Connect. A value with no tag is yours. See Where a value comes from.

Clearing a value

Clearing a value does not just blank it. The phone records that you cleared it, so another phone with the same account learns about the clear. Otherwise the second phone could not tell “cleared” from “never logged”.