feat: add AdminMessage persistence + conversation title auto-set + messages API

prisma/migrations/20260522110000_add_conversation_and_message/migration.sql

@@ -7,12 +7,24 @@ CREATE TABLE `AdminConversation` (
     `createdAt` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
     `updatedAt` DATETIME(3) NOT NULL,
     `deletedAt` DATETIME(3) NULL,
-
     UNIQUE INDEX `AdminConversation_hermesSessionId_key`(`hermesSessionId`),
     INDEX `AdminConversation_adminUserId_idx`(`adminUserId`),
     INDEX `AdminConversation_hermesSessionId_idx`(`hermesSessionId`),
     PRIMARY KEY (`id`)
 ) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
 
+-- CreateTable
+CREATE TABLE `AdminMessage` (
+    `id` VARCHAR(191) NOT NULL,
+    `conversationId` VARCHAR(191) NOT NULL,
+    `role` VARCHAR(16) NOT NULL,
+    `content` LONGTEXT NOT NULL,
+    `createdAt` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
+    INDEX `AdminMessage_conversationId_idx`(`conversationId`),
+    INDEX `AdminMessage_createdAt_idx`(`createdAt`),
+    PRIMARY KEY (`id`)
+) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
+
 -- AddForeignKey
 ALTER TABLE `AdminConversation` ADD CONSTRAINT `AdminConversation_adminUserId_fkey` FOREIGN KEY (`adminUserId`) REFERENCES `AdminUser`(`id`) ON DELETE RESTRICT ON UPDATE CASCADE;
+ALTER TABLE `AdminMessage` ADD CONSTRAINT `AdminMessage_conversationId_fkey` FOREIGN KEY (`conversationId`) REFERENCES `AdminConversation`(`id`) ON DELETE CASCADE ON UPDATE CASCADE;

prisma/schema.prisma

@@ -803,9 +803,23 @@ model AdminConversation {
   createdAt       DateTime  @default(now())
   updatedAt       DateTime  @updatedAt
   deletedAt       DateTime?
+  messages        AdminMessage[]
 
   adminUser       AdminUser @relation(fields: [adminUserId], references: [id])
 
   @@index([adminUserId])
   @@index([hermesSessionId])
 }
+
+model AdminMessage {
+  id             String   @id @default(cuid())
+  conversationId String
+  role           String   @db.VarChar(16)
+  content        String   @db.LongText
+  createdAt      DateTime @default(now())
+
+  conversation   AdminConversation @relation(fields: [conversationId], references: [id])
+
+  @@index([conversationId])
+  @@index([createdAt])
+}

src/modules/admin-ai-chat/admin-ai-chat.service.ts

@@ -20,8 +20,17 @@ export class AdminAiChatService {
     const conversationId = dto.conversationId
       ?? (await this.conversationService.create(adminUserId)).id;
 
+    // Save user message
+    const userMsg = dto.messages[dto.messages.length - 1];
+    if (userMsg && userMsg.role === 'user') {
+      await this.conversationService.saveMessage(conversationId, 'user', userMsg.content);
+    }
+
     const result = await this.callHermes(dto.messages, sessionId);
 
+    // Save assistant reply
+    await this.conversationService.saveMessage(conversationId, 'assistant', result.content);
+
     return { ...result, conversationId };
   }
 

src/modules/admin-conversation/admin-conversation.controller.ts

@@ -1,5 +1,5 @@
 import { Controller, Get, Post, Patch, Delete, Param, Body, Req, UseGuards } from '@nestjs/common';
-import { ApiTags, ApiBearerAuth } from '@nestjs/swagger';
+import { ApiTags, ApiBearerAuth, ApiOperation } from '@nestjs/swagger';
 import { AdminConversationService } from './admin-conversation.service';
 import { CreateConversationDto, UpdateConversationDto } from './dto';
 import { AdminAuthGuard } from '../../common/guards/admin-auth.guard';
@@ -16,6 +16,12 @@ export class AdminConversationController {
     return this.svc.list(req.adminUser.id);
   }
 
+  @Get(':id/messages')
+  @ApiOperation({ summary: '获取对话的历史消息' })
+  async messages(@Req() req: any, @Param('id') id: string) {
+    return this.svc.getMessages(id, req.adminUser.id);
+  }
+
   @Post()
   async create(@Req() req: any, @Body() dto: CreateConversationDto) {
     return this.svc.create(req.adminUser.id, dto.title);
@@ -23,7 +29,7 @@ export class AdminConversationController {
 
   @Patch(':id')
   async update(@Req() req: any, @Param('id') id: string, @Body() dto: UpdateConversationDto) {
-    await this.svc.update(id, req.adminUser.id, dto.title!);
+    await this.svc.updateTitle(id, req.adminUser.id, dto.title);
     return { success: true };
   }
 

src/modules/admin-conversation/admin-conversation.service.ts

@@ -14,6 +14,19 @@ export class AdminConversationService {
     });
   }
 
+  async getMessages(conversationId: string, adminUserId: string) {
+    const conv = await this.prisma.adminConversation.findFirst({
+      where: { id: conversationId, adminUserId, deletedAt: null },
+    });
+    if (!conv) return [];
+
+    return this.prisma.adminMessage.findMany({
+      where: { conversationId },
+      orderBy: { createdAt: 'asc' },
+      select: { id: true, role: true, content: true, createdAt: true },
+    });
+  }
+
   async create(adminUserId: string, title?: string) {
     const hermesSessionId = randomUUID();
     return this.prisma.adminConversation.create({
@@ -22,7 +35,7 @@ export class AdminConversationService {
     });
   }
 
-  async update(id: string, adminUserId: string, title: string) {
+  async updateTitle(id: string, adminUserId: string, title: string) {
     return this.prisma.adminConversation.updateMany({
       where: { id, adminUserId, deletedAt: null },
       data: { title },
@@ -36,6 +49,29 @@ export class AdminConversationService {
     });
   }
 
+  async saveMessage(conversationId: string, role: string, content: string) {
+    await this.prisma.adminMessage.create({
+      data: { conversationId, role, content },
+    });
+    // Update conversation timestamp and auto-set title from first user message
+    if (role === 'user') {
+      const conv = await this.prisma.adminConversation.findUnique({
+        where: { id: conversationId },
+        select: { title: true, _count: { select: { messages: true } } },
+      });
+      // Auto-title: use first user message (truncated)
+      const isFirstMessage = (conv?._count?.messages ?? 0) <= 1;
+      const updateData: any = { updatedAt: new Date() };
+      if (isFirstMessage && conv?.title === '新对话') {
+        updateData.title = content.slice(0, 40);
+      }
+      await this.prisma.adminConversation.update({
+        where: { id: conversationId },
+        data: updateData,
+      });
+    }
+  }
+
   async getSessionId(conversationId: string, adminUserId: string) {
     const conv = await this.prisma.adminConversation.findFirst({
       where: { id: conversationId, adminUserId, deletedAt: null },