digital-psychology/docs/BACKEND_DESIGN/BD-2026-027-knowledge-chunk.md

Backend Design: ECR-027 KnowledgeChunk

| ID | BD-2026-027 | | Status | Approved | | Coding | Loop authorized | | Level | L2 | | Migration | YES 000028 |

Backend Change Boundary

Domain: KnowledgeChunk (read)
App: AdminHandler → admin.Service → AdminRepo
API: GET /admin/ai/knowledge-chunks; GET /admin/ai/knowledge-chunks/{id}
Permission: admin.ai_config.read
Migration: 000028

Out of boundary

Embedding · 上传切块 · 运行时 RAG 接线 · UGC · 真支付

Rollback: down migration + remove routes/UI