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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 have never used it, but this looks like its a Foss implementation of a lot of the digital wellbeing features, including grayscale at set times. it has special installation instructions after you install the app tho, which can be found here
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