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pgvector HNSW index on a 10M-row chunk table takes 800ms p95 for top-10 nearest-neighbor search. Index size is 14GB (larger than the data). Rebuilding with ef_construction=64 and M=16 didn't help. Queries should be ~50ms at this scale.
A Supabase query behind a row-level security policy takes 30+ seconds for a signed-in user. Without RLS the same query runs in 40ms. EXPLAIN shows the policy's USING clause forces a sequential scan over 2M rows per call.