Point-in-Time Retrieval Quick Reference
Recall the checks that make point-in-time retrieval safe.
What must every entity dataframe row contain for historical retrieval? The entity key and the prediction or event timestamp that defines the decision moment. The timestamp is the boundary between knowable evidence and future leakage. What does TTL protect during a point-in-time join? It prevents feature values that are too old for the decision from being joined as if they were current enough. TTL is relative to each entity row timestamp, not to when the query runs. Current snapshot versus point-in-time retrieval Compare Choose point-in-time retrieval for training and backtesting whenever feature values change over time. Objection: The current table…
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