I would like to create an Apple Watch only app that queries data such as blood oxygenation, heart varibility, number of steps, energy consumed, and other data of a similar nature recorded over the past month and performs calculations on them. I read from the HealthKit documentation that Apple Watch synchronizes data with iPhone and periodically deletes older data, and that I can get the date from which the data is available with earliestPermittedSampleDate().
Is there a risk that in general, by making queries to retrieve data up to a month old, the data will no longer be available?
I need the app to work properly without needing an iPhone.
AngB
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