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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 anyone's interested, the source code is at https://github.com/alexpdp7/plankalkul/ ; it uses GH Actions, so it's quite easy to make modifications and run your own. It's implemented completely in Rust (using WASM).
NOTE:
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Hence, a higher number means a more popular project.