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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 use qaac as a CLI wrapper for the iTunes encoder. I don't use foobar, but I'm sure there's the option to set up using an external encoder. Every music manager I've ever used (except iTunes of course) has some way of setting up an external encoder via a command line.
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