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Previous answer by Gordon on another conversation:
The health app on the Bangle only stores data every 10 minutes. The '3 minute' option is for the heart rate - it'll take 3 HRM samples every 10 minute slot and use the best/average value of HRM readings - but it only stores one reading per 10 minutes.
If you want more than every 10 minutes and more useful data, you'd be better off just using the recorder app on the Bangle: https://banglejs.com/apps/?id=recorder
https://forum.espruino.com/conversations/386312/#comment16972306
Yes, but I suspect you'll run into problems anyway that would need to be solved. If Gadgetbridge expects every record entry to correspond to 10 minute periods but your entries corresponds to variable length periods - what happens? I don't know.