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receipt_budget
An application for managing your personal expenses. It can OCR your receipts and makes statistics of your expenses.
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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.
For "middle ground" projects like this (criteria: a common enough problem that lots of people _should_ have thought about it -- but it may not be a lucrative core business area -- and there aren't any household-name open source projects that cover it), I often turn to GitHub repository search to see what's available.
Based on that, your best bet might be https://github.com/ReceiptManager/receipt-parser-legacy, which is a Python library built on top of the Tesseract OCR engine. You can use it containerized, in Android/iOS applications, or via your own Python scripts.