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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.
Thankfully the code is open source (GNU Affero GPL) so anyone can look through it make any modifications and self host it.
It does! The source code seems like gnu-esque licence.
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