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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'm guessing one could use [eww](https://elkowar.github.io/eww/) to create buttons/widgets. And the buttons could dispatch commands to any of the wallpaper/theme changing applications to actually execute the change.
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