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An old event timestamp can still leak future information into training data

A payment happened at 11:45. Your system received it at 12:10. Could a decision made at noon have used it? Filtering on the event timestamp alone says yes. Reconstructing what the system knew at noon says no. That difference matters when building historical features. A backfilled event can be old i…

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  1. 2026-10-22 18:02 · DEV Community — Machine Learning
    An old event timestamp can still leak future information into training data

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