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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 am one of the developers of the IRMA app, which uses exactly this structure. The IRMA app is a free and open source app allowing users to receive and selectively disclose personal data signed by trusted third parties.
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Hence, a higher number means a more popular project.