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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'd rather check https://github.com/hadley/r4ds/issues & https://github.com/hadley/r4ds/pulls to get an idea of how much work in progress the 2E really is, it's also worth checking closed issues, same for pulls. There are some chapters with a red warning in the header:
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