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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.
You may also want to get the Audible metadata agent for Plex, https://github.com/macr0dev/Audiobooks.bundle
Jellyfins book support is kinda eh right now, it'll probably take another major version or two. I'm using calibre-web until JF feels ready. Clients shouldn't be a problem though, any web browser will do.
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