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Stirling-PDF
#1 Locally hosted web application that allows you to perform various operations on PDF files
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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.
My use-case was easier than yours (microfiche of type) but I found this https://github.com/Stirling-Tools/Stirling-PDF incredibly handy.
I still had to write a bit of Python, but this really is a PDF swiss army knife.
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