# Backend Design: ECR-021 AICoreConfig

| ID | BD-2026-021 |
| Status | Approved |
| Coding | Loop authorized |
| Level | L2 |
| Migration | YES 000022 |

## Backend Change Boundary

```text
Domain: SystemPrompt (read catalog)
App: AdminHandler → admin.Service → AdminRepo
API: GET /admin/ai/system-prompts[+/:id]
Permission: admin.ai_config.read
Migration: 000022 table + seed ask_default + perm
UI: admin-h5 /ai
```

## Out of boundary

Prompt write/publish · Knowledge* · ToolDefinition · runtime engine swap · UGC · Payment

Rollback: down migration + remove routes/UI