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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.
Not in emacs, but I wrote this to export clock entries to csv and then you can use whatever you want to plot the data. https://github.com/legalnonsense/org-clock-export
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