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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
It was a Russian forum, but I can't find it. https://github.com/MNVolkov/libbip https://likeapp.soft112.com it's called BipOS.
The device is safe since on iOS I restrict the Zepp app from any internet, but you need to refresh your GPS with the app. On Android it's much safer with something like gadgetbridge.
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Hence, a higher number means a more popular project.