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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.
Another alternative is Elements of Programming Interviews in python, along with this repo that maps EPI problems to LC problems. https://github.com/slgriff/EPI-to-LC
NOTE:
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Hence, a higher number means a more popular project.