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How do you keep a RAG system's knowledge fresh (index updates, stale data, changing documents)?

A RAG system is only as current as its index, and stale or duplicated content silently degrades answers. The signal is an incremental pipeline with deletes, updates, and recency signals, not a one-time bulk load. Here is the answer.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

A RAG system is only as current as its index, and stale or duplicated content silently degrades answers. The signal is an incremental pipeline with deletes, updates, and recency signals, not a one-time bulk load. Here is the answer.

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