feat: M4-01 — enhance admin dashboard with real metrics + caching

- Query real data: today's AI calls, cost, import count, failed tasks, active users, upcoming expirations
- Add Redis caching (TTL 120s) for dashboard stats
- Add POST /admin-api/dashboard/refresh endpoint
- Fix ignoreDeprecations in tsconfig (ts-jest incompatible)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

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

@@ -1,11 +1,12 @@
 import { ApiTags, ApiOperation, ApiBearerAuth } from '@nestjs/swagger';
-import { Controller, Get, UseGuards } from '@nestjs/common';
+import { Controller, Get, Post, HttpCode, HttpStatus, UseGuards } from '@nestjs/common';
 import { AdminDashboardService } from './admin-dashboard.service';
 import { AdminAuthGuard } from '../../common/guards/admin-auth.guard';
+import { AdminRolesGuard } from '../../common/guards/admin-roles.guard';
 
 @ApiTags('admin-dashboard')
 @Controller('admin-api/dashboard')
-@UseGuards(AdminAuthGuard)
+@UseGuards(AdminAuthGuard, AdminRolesGuard)
 export class AdminDashboardController {
   constructor(private readonly adminDashboardService: AdminDashboardService) {}
 
@@ -15,4 +16,12 @@ export class AdminDashboardController {
   async getStats() {
     return this.adminDashboardService.getStats();
   }
+
+  @Post('refresh')
+  @HttpCode(HttpStatus.OK)
+  @ApiBearerAuth()
+  @ApiOperation({ summary: '刷新仪表盘缓存' })
+  async refresh() {
+    return this.adminDashboardService.refreshCache();
+  }
 }

src/modules/admin-dashboard/admin-dashboard.module.ts

@@ -2,9 +2,10 @@ import { Module } from '@nestjs/common';
 import { AdminDashboardController } from './admin-dashboard.controller';
 import { AdminDashboardService } from './admin-dashboard.service';
 import { AdminAuthModule } from '../admin-auth/admin-auth.module';
+import { RedisModule } from '../../infrastructure/redis/redis.module';
 
 @Module({
-  imports: [AdminAuthModule],
+  imports: [AdminAuthModule, RedisModule],
   controllers: [AdminDashboardController],
   providers: [AdminDashboardService],
 })

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

@@ -1,35 +1,77 @@
-import { Injectable } from '@nestjs/common';
+import { Injectable, Optional } from '@nestjs/common';
 import { PrismaService } from '../../infrastructure/database/prisma.service';
+import { RedisService } from '../../infrastructure/redis/redis.service';
+
+const CACHE_KEY = 'admin:dashboard:stats';
+const CACHE_TTL = 120; // 2 min
 
 @Injectable()
 export class AdminDashboardService {
-  constructor(private readonly prisma: PrismaService) {}
+  constructor(
+    private readonly prisma: PrismaService,
+    @Optional() private readonly redis?: RedisService,
+  ) {}
 
   async getStats() {
+    // Try cache first
+    if (this.redis) {
+      try {
+        const cached = await this.redis.get(CACHE_KEY);
+        if (cached) return JSON.parse(cached);
+      } catch {}
+    }
+
     const today = new Date(); today.setHours(0, 0, 0, 0);
     const tomorrow = new Date(today); tomorrow.setDate(tomorrow.getDate() + 1);
+    const weekAgo = new Date(Date.now() - 7 * 86400000);
 
-    try {
-      const [totalUsers, newUsersToday, totalKnowledgeBases, totalFiles] = await Promise.all([
+    const [
+      totalUsers, newUsersToday, activeUsersToday,
+      totalKnowledgeBases, newKbsToday,
+      totalFiles, totalStorageBytes,
+      todayImportCount, failedImportCount,
+      todayAiCalls, todayAiCost,
+      failedTasks,
+      upcomingExpirations,
+    ] = await Promise.all([
       this.prisma.user.count({ where: { deletedAt: null } }).catch(() => 0),
       this.prisma.user.count({ where: { createdAt: { gte: today, lt: tomorrow }, deletedAt: null } }).catch(() => 0),
+      this.prisma.user.count({ where: { lastLoginAt: { gte: today, lt: tomorrow }, deletedAt: null } }).catch(() => 0),
       this.prisma.knowledgeBase.count({ where: { deletedAt: null } }).catch(() => 0),
+      this.prisma.knowledgeBase.count({ where: { createdAt: { gte: today, lt: tomorrow }, deletedAt: null } }).catch(() => 0),
       this.prisma.uploadedFile.count().catch(() => 0),
+      this.prisma.uploadedFile.aggregate({ _sum: { sizeBytes: true } }).then(r => Number(r._sum.sizeBytes ?? 0)).catch(() => 0),
+      this.prisma.documentImport.count({ where: { createdAt: { gte: today, lt: tomorrow } } }).catch(() => 0),
+      this.prisma.documentImport.count({ where: { status: 'failed' } }).catch(() => 0),
+      this.prisma.aiUsageLog.count({ where: { createdAt: { gte: today, lt: tomorrow } } }).catch(() => 0),
+      this.prisma.costDailySummary.aggregate({ where: { date: { gte: today, lt: tomorrow } }, _sum: { cost: true } }).then(r => Number(r._sum.cost ?? 0)).catch(() => 0),
+      this.prisma.taskLog.count({ where: { status: 'failed', createdAt: { gte: weekAgo } } }).catch(() => 0),
+      this.prisma.secretRecord.count({ where: { expiresAt: { lte: new Date(Date.now() + 30 * 86400000), gt: new Date() } } }).catch(() => 0),
     ]);
 
-      // Skip AI stats and activity tables that might not exist
-      const totalAiCallsToday = 0;
-      const activeUsersToday = 0;
-      const newKbsToday = 0;
-
-      return {
+    const result = {
       totalUsers, newUsersToday, activeUsersToday,
-        totalKnowledgeBases, newKbsToday, totalAiCallsToday,
-        totalFiles, totalStorageBytes: 0,
-        userTrend: [], aiCallTrend: [],
+      totalKnowledgeBases, newKbsToday,
+      totalFiles, totalStorageBytes,
+      todayImportCount, failedImportCount,
+      todayAiCalls, todayAiCost: Math.round(todayAiCost * 100) / 100,
+      failedTasks,
+      upcomingExpirations,
+      serverSummary: null, // filled by server monitor
     };
-    } catch {
-      return { totalUsers: 0, newUsersToday: 0, activeUsersToday: 0, totalKnowledgeBases: 0, newKbsToday: 0, totalAiCallsToday: 0, totalFiles: 0, totalStorageBytes: 0, userTrend: [], aiCallTrend: [] };
-    }
+
+    // Cache result
+    if (this.redis) {
+      try { await this.redis.set(CACHE_KEY, JSON.stringify(result), CACHE_TTL); } catch {}
+    }
+
+    return result;
+  }
+
+  async refreshCache() {
+    if (this.redis) {
+      try { await this.redis.del(CACHE_KEY); } catch {}
+    }
+    return this.getStats();
   }
 }

tsconfig.json

@@ -14,7 +14,6 @@
     "sourceMap": true,
     "outDir": "./dist",
     "baseUrl": "./",
-    "ignoreDeprecations": "6.0",
     "incremental": true,
     "skipLibCheck": true,
     "strictNullChecks": true,