The assistant cites documents that were valid at retrieval time but invalid at response time. How would you handle that?

Instruction: Describe how you would deal with time-sensitive evidence in a RAG system.

Context: Tests how the candidate diagnoses the problem, chooses the safest next step, and reasons through recovery. Describe how you would deal with time-sensitive evidence in a RAG system.

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I would treat validity as time-sensitive state, not just static content. If a document can become invalid between retrieval and response, the system needs a revalidation step before final answer generation or before rendering citations.

Practically, that means each retrieved document or chunk carries version and...

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