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pgvector HNSW Filtering: My RAG Asked for 10 Rows and Got 0

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The support ticket was one line long: "Your assistant says our docs don't mention refunds. We have an entire page called Refunds." I checked. The page was there. It was chunked, embedded, and sitting in Postgres with the right tenant_id. I ran the exact retrieval query the bot runs, by hand, in psql.

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