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A text-to-SQL agent generates queries that run but ignore obvious indexes — doing full scans on the 200M-row events table when a user-id index would answer the query in <50ms. Showing the schema DDL (including indexes) in the prompt helps marginally.
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.