# Backend Design: ECR-020 QualityFeedback

| ID | BD-2026-020 |
| Status | Approved |
| Coding | Loop authorized |
| Level | L2 |
| Migration | YES 000021 |

## Backend Change Boundary

```text
Domain: QualityFeedback
App: AdminHandler + AskHandler → services → repos
API: GET /admin/ask/feedback
     POST /admin/ask/threads/{id}/feedback
     POST /ask/threads/{id}/feedback
Permission: admin.ask.read · admin.ask.feedback.write
Migration: 000021
UI: admin-h5 /ask feedback panel
```

## Out of boundary

Message mutation · SystemPrompt · UGC plaza · Payment

Rollback: down migration + remove routes/UI