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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.
if you know what compiler target is used on your pi 2 you can probably get someone to cross compile it for you. https://github.com/ziglang/zig-bootstrap This should be reasonably easy to use.
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Hence, a higher number means a more popular project.