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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.
I think it can be OK, especially if you harden it with HardConfigurator (https://github.com/AndyFul/Hard_Configurator) and/or privacy.sexy
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