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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.
Auditing an entire year's log seems very excessive. However, timestamps are recorded, focus is recorded, and I've heard of cheaters being caught from this information. It's not the focus, but Canvas is partly a forensic tool.
And from my own observation, having a file open in the background with no focus does send occasional requests for other random file metadata that aren't open at all, so that's probably a source of the false accusations. Also, it's open source if any hackers would like to take a look.
https://github.com/instructure/canvas-lms