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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.
Take a look at Frigate for the NVR side of things; you can run that in a docker on a NAS, and bundle it with [Home Assistant](hass.io) for automations and alerts. Finding wireless IP cams and doorbell cams is easy, but as far as running off a battery I’m not sure. You could probably rig up a solar panel and 12v battery pretty easily though.
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