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changedetection.io
The best and simplest free open source web page change detection, website watcher, restock monitor and notification service. Restock Monitor, change detection. Designed for simplicity - Simply monitor which websites had a text change for free. Free Open source web page change detection, Website defacement monitoring, Price change notification
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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.
We have a feature request for exactly that :) https://github.com/dgtlmoon/changedetection.io/issues/708 but it depends on time, which depends on how many paid subscribers we have :/
See https://github.com/caronc/apprise/wiki/Notify_homeassistant for supported HomeAssistant notifications (Control your Home Assistant when changes to web site content or a JSON API occurs)