Enforce Permissions Inside the pgvector Query, Not After It
This story is from 2026-09-23. It is preserved in the archive; the latest stories are on the live feed.
Most permission bugs in RAG systems look harmless in review. You retrieve the top-k nearest chunks, then you drop the ones the user is not allowed to see. It reads as correct. It is not, and the failure is quiet. I want to show you why the post-filter is the wrong place, and how to push the access-…
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- 2026-09-23 09:30 · DEV Community — AI
Enforce Permissions Inside the pgvector Query, Not After It