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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.
The rest of our signage uses Xibo (on Android players), which no longer explicitly supports the rPI, but you might be able to get one of their dists to run. They offer perpetual licenses, though make sure what they have on offer will work for you.
We used to use the Open Source Edition of Screenly. If you're okay with managing each display separately by IP it might be a workable option, though time consuming. Paid version offers a centralized CMS, but I haven't tried it.
Currently running two rPI players using piSignage, which gives you two player licenses for free. Cloud managed and really fast.