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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.
Anyway, why don't you ping Marcel? He is the developer of the application. In my experience, he is super proactive to help, advise, and support. https://github.com/M66B/FairEmail/blob/master/FAQ.md
NOTE:
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Hence, a higher number means a more popular project.