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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.
ytarchive is a command-line tool that can monitor a YouTube channel and get the entirety of a stream even if the download starts late. (yt-dlp also supports this with --live-from-start, but it's currently experimental.)
hoshinova is a nice enough web frontend on top of ytarchive that allows you to monitor multiple channels, queue recording for additional URLs, and optionally filter based on keywords in the stream title. Monitoring in this tool is done by polling the channel's RSS feed. If you use this frontend you will likely want to use it with ytarchive 0.3.2; it parses the application's output and at this time the latest published package doesn't seem to correctly handle anything newer.