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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.
Details are at https://www.snebu.com/tarcrypt.html if you want to look it over (and tarcypt is part of the Snebu project https://github.com/derekp7/snebu). I'd love to get another pair of eyes on this to point out any non-obvious security limitations.
NOTE:
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Hence, a higher number means a more popular project.