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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.
https://github.com/pipes-digital/pipes can extract feeds from pages. Pattern recognizer logic when trying the UI is a bit simple, but you can also write selectors on your own. It could work for you.
https://github.com/RSS-Bridge/rss-bridge would be the default recommendation though, especially if it is for known sites.
NOTE:
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