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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.
after having downloaded the books you want through the kobo desktop software, use calibre and the obok dedrm plugin (downloaded books get detected automatically) to remove the drm and get standard epubs you can use anywhere https://github.com/noDRM/DeDRM_tools/releases
NOTE:
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Hence, a higher number means a more popular project.