- clean_sql() strips markdown fences, leading "sql" keyword, trailing explanations
- Schema context now includes table relationships (JOIN paths)
- Explicit note: "vertical only in candidates/clients/job_orders, JOIN for others"
- Full column paths (table.column) in schema to reduce ambiguity
- Auto-retry on schema errors feeds error + schema back to model
- TESTED: 4 questions all return correct results:
"highest avg salary" → IT $2,213 ✓
"top 5 earning over $50/hr" → correct candidates ✓
"most placements by vertical" → Industrial 10,096 ✓
"revenue by client" → 1,996 clients ✓
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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