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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 not sure what he's actually using but frigate can do what he's described. It's FOSS and has a home assistant integration (unofficially, has to be installed through HACS).
Most of the passing of Frigate frames to CompreFace/Facebox happens here: https://github.com/jakowenko/frigate-events/blob/master/src/controllers/recognize.controller.js#L158
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