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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.
Just one thing: the apartment gem, used on the book, stopped to be updated and support only Rails 5.2. But there is an active fork, very well maintained, that supports rails 6.1: https://github.com/rails-on-services/apartment
NOTE:
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Hence, a higher number means a more popular project.