System Design Patterns: From Fundamentals to Real Systems

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RAG Pipeline

1. The Incident

The support assistant tells a customer, confidently and politely, that the return window is 60 days. The customer returns a product on day 45. The policy: updated last quarter: is 30 days. The dispute escalates, the refund is granted as goodwill, and the postmortem contains this lesson's founding sentence: the model wasn't malfunctioning: it was out of date.

The 60-day figure lives in the model's weights: knowledge baked in at training time, a snapshot of the world as of its training data

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