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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.
coderbyte had some react challenges but there are also cool things like https://github.com/felipefialho/frontend-challenges
maybe you would enjoy this: https://github.com/mithi/epic-react-exercises
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