- Bug: Execute endpoint calculated quality but never validated it
- Three trades executed at quality 30/50/50 (threshold: 90/95)
- All three stopped out, confirming low quality = losing trades
- Root cause: TradingView sent incomplete data (metrics=0, old v5) + missing validation after timeframe check
- Fix: Added validation block lines 193-213 in execute/route.ts
- Returns HTTP 400 if quality < minQualityScore
- Deployed: Nov 27, 2025 23:16 UTC (commit cefa3e6)
- Lesson: Calculate ≠ Validate - minQualityScore must be enforced at ALL execution pathways
This documents the CRITICAL FIX from commit cefa3e6.
Per Nov 27 mandatory documentation rules, work is INCOMPLETE without copilot-instructions.md updates.
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