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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.
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Paperless-ng
Discontinued A supercharged version of paperless: scan, index and archive all your physical documents
You could try something like https://github.com/the-paperless-project/paperless
https://github.com/stweiss/FileBasedMiniDMS
I tried both Mayan and Paperless (regular) myself to replace my Evernote Premium setup, they haven't convinced me yet.
I am currently trying out https://github.com/jbarlow83/OCRmyPDF myself (had to fork it to add my own language to the Dockerfile) and then will either let my NAS index it afterwards or Dropbox/Nextcloud maybe. Apparently locally they get indexed very well with either Gnome (Linux) or Finder (Mac) or Explorer (Windows).
https://github.com/jonaswinkler/paperless-ng
And this slightly older FileBasedMiniDMS: