supabase-sql-skill

<quick_start> Clean any SQL migration:

1. Fix typos (- → -- for comments)
2. Add idempotency (IF NOT EXISTS, DROP ... IF EXISTS)
3. Fix RLS policies (service role uses TO service_role, not JWT checks)
4. Remove dead code (unused enums)
5. Standardize casing (NOW(), TIMESTAMPTZ)
6. Add dependencies comment at end

DROP POLICY IF EXISTS "Policy name" ON table_name;
CREATE POLICY "Policy name" ON table_name ...

</quick_start>