Instruction: Describe how you would preserve freshness while controlling ingestion cost.
Context: Checks whether the candidate can explain the core concept clearly and connect it to real production decisions. Describe how you would preserve freshness while controlling ingestion cost.
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The way I'd approach it in an interview is this: I keep RAG fresh by separating change detection from full reindexing. Every document should have a stable identity, a version or content hash, and clear timestamps. That lets the pipeline detect what actually changed instead of rebuilding the whole corpus....
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