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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 am building Immich - https://github.com/alextran1502/immich for backing up photos and videos from your phone. Probably this is what you are looking for?
They call it High Performance Backend for Files but all I can find is one repo on github with Rust called notify_push. But it's just a push notification server to off load clients periodic checking for updates against nc server.
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