api-server/prisma/migrations/backfill_chat_scope.sql
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feat: M-CHAT ChatScope 会话系统完整实现
## 数据模型
- ChatSession +13 字段 (scopeType/scopeId/parentKnowledgeBaseId/createdFrom/isPinned/isArchived/isDeleted/modelMode/modelId/lastMessageAt)
- ChatMessage +scopeSnapshot (消息级 scope 快照)
- ChatCitation +lineStart/lineEnd +sourceId 索引
- 5 个新查询索引

## 核心能力
- open-or-create: 同 scope 继续会话 (200) / 新建 (201)
- scope 级检索: global/knowledge_base/material/knowledge_item/folder
- listSessions: scope 过滤 + isDeleted 排除 + isPinned 排序 + 分页元数据
- 自动标题: 首条消息截取 + 词边界处理
- 软删除 + 置顶/归档
- scope 字段创建后不可修改
- 全部端点 userId 鉴权

## 文档
- docs/chat-scope-design.md (设计文档 + 决策表)
- docs/chat-scope-api-contract.md (API 契约)
- docs/chat-scope-test-plan.md (33 条测试用例)
- prisma/migrations/backfill_chat_scope.sql (旧数据回填)

## Bug 修复
- #104: KnowledgeItem.sourceRef 填充 (material scope 检索修复)
- #102: sendMessageStream aiGateway null 保护
- listSessions isDeleted/isArchived 过滤 + 分页

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-06-06 17:27:40 +08:00

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-- ============================================================
-- M7-10: ChatScope 旧数据回填
-- 将 M-CHAT 里程碑前创建的旧会话补全 scope 字段
-- 可重复执行idempotent只更新 scopeId IS NULL 的记录
-- ============================================================
-- 1. 回填 scope 字段
UPDATE "ChatSession"
SET
"scopeType" = 'knowledge_base',
"scopeId" = "knowledgeBaseId",
"parentKnowledgeBaseId" = "knowledgeBaseId",
"createdFrom" = 'legacy_migration',
"lastMessageAt" = COALESCE("lastMessageAt", "updatedAt")
WHERE "scopeId" IS NULL
AND "scopeType" = 'knowledge_base'; -- 默认值
-- 2. 验证
-- SELECT COUNT(*) AS backfilled_count FROM "ChatSession" WHERE "createdFrom" = 'legacy_migration';
-- SELECT id, title, "scopeType", "scopeId", "parentKnowledgeBaseId", "createdFrom" FROM "ChatSession" WHERE "scopeId" IS NULL;