diff --git a/src/index.ts b/src/index.ts
index 4f97045..c6e106e 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -13,6 +13,7 @@ import schemeAobRoutes from './routes/schemesAob';
 import filterRoutes from './routes/filters';
 import vipRoutes from './routes/vip';
 import favoriteRoutes from './routes/favorites';
+import { prisma } from './utils/prisma';
 
 const app = express();
 const PORT = process.env.PORT || 3001;
@@ -49,22 +50,31 @@ app.use(cors({
 app.use(express.json({ limit: '10mb' }));
 app.use(express.urlencoded({ extended: true }));
 
-// 速率限制
+// 速率限制 — 全局
 const limiter = rateLimit({
-  windowMs: 15 * 60 * 1000, // 15 分钟
-  max: 100, // 每个 IP 最多 100 次请求
+  windowMs: 15 * 60 * 1000,
+  max: 1000,
   message: { success: false, message: '请求过于频繁，请稍后再试' },
 });
 app.use('/api/', limiter);
 
-// 登录接口更严格的限制
-const loginLimiter = rateLimit({
+// 敏感端点更严格的限制
+const strictLimiter = rateLimit({
   windowMs: 15 * 60 * 1000,
   max: 10,
-  message: { success: false, message: '登录尝试过于频繁，请稍后再试' },
+  message: { success: false, message: '操作过于频繁，请稍后再试' },
 });
-app.use('/api/login', loginLimiter);
-app.use('/api/register', loginLimiter);
+app.use('/api/login', strictLimiter);
+app.use('/api/register', strictLimiter);
+
+// 会话轮询限流 (防止高频 session-status 刷库)
+const pollLimiter = rateLimit({
+  windowMs: 60 * 1000,
+  max: 60,
+  message: { success: false, message: '轮询过于频繁' },
+});
+app.use('/api/session-status', pollLimiter);
+app.use('/api/vip-status', pollLimiter);
 
 // ============================================
 // 路由
@@ -94,8 +104,6 @@ app.use('/api', vipRoutes);
 // 收藏计数（放在 favorites 路由之前，避免 auth 中间件拦截）
 app.get('/api/favorites/count', async (req: Request, res: Response) => {
   try {
-    const { PrismaClient } = require('@prisma/client');
-    const prisma = new PrismaClient();
     const count = await prisma.favorite.count();
     res.json({ success: true, count });
   } catch (e) {
@@ -209,7 +217,9 @@ app.post('/api/adverts/:id/click', (req, res) => {
 // 头像列表
 app.get('/api/avatars', (req, res) => {
   res.json({ success: true, data: [] });
+});
 
+// ============================================
 // 更新服务 (electron-updater)
 // ============================================
 
@@ -234,6 +244,7 @@ releaseDate: '2024-01-01T00:00:00.000Z'
 
 // ============================================
 // 开发工具端点 (需 ADMIN_SECRET)
+// ============================================
 app.post('/api/admin/set-vip', async (req, res) => {
   const secret = process.env.ADMIN_SECRET;
   if (!secret || req.headers['x-admin-secret'] !== secret) {
@@ -242,8 +253,6 @@ app.post('/api/admin/set-vip', async (req, res) => {
   try {
     const { username, isVip } = req.body;
     if (!username) return res.status(400).json({ success: false, message: '缺少 username' });
-    const { PrismaClient } = require('@prisma/client');
-    const prisma = new PrismaClient();
     const user = await prisma.user.update({
       where: { username },
       data: {
@@ -252,36 +261,12 @@ app.post('/api/admin/set-vip', async (req, res) => {
         vipLevel: isVip !== false ? 1 : 0,
       },
     });
-    await prisma.$disconnect();
     res.json({ success: true, username: user.username, isVip: user.isVip });
   } catch (e: any) {
-    res.status(500).json({ success: false, message: e.message });
+    console.error('Admin set-vip error:', e);
+    res.status(500).json({ success: false, message: '操作失败' });
   }
 });
-});
-
-// ============================================
-// 更新服务 (electron-updater)
-// ============================================
-
-// 更新配置
-app.get('/update-config.json', (req, res) => {
-  res.json({
-    version: '7.0.4',
-    url: '',
-    notes: '',
-    mandatory: false,
-  });
-});
-
-// latest.yml (electron-updater 标准格式)
-app.get('/latest.yml', (req, res) => {
-  res.type('text/yaml');
-  res.send(`version: 7.0.4
-files: []
-releaseDate: '2024-01-01T00:00:00.000Z'
-`);
-});
 
 // ============================================
 // 错误处理
diff --git a/src/middleware/auth.ts b/src/middleware/auth.ts
index c9f3c16..196be63 100644
--- a/src/middleware/auth.ts
+++ b/src/middleware/auth.ts
@@ -1,8 +1,6 @@
 import { Request, Response, NextFunction } from 'express';
 import { verifyToken, extractToken } from '../utils/jwt';
-import { PrismaClient } from '@prisma/client';
-
-const prisma = new PrismaClient();
+import { prisma } from '../utils/prisma';
 
 // 扩展 Request 类型
 declare global {
diff --git a/src/routes/auth.ts b/src/routes/auth.ts
index 5e61b14..4d2e7be 100644
--- a/src/routes/auth.ts
+++ b/src/routes/auth.ts
@@ -1,12 +1,11 @@
 import { Router, Request, Response } from 'express';
 import bcrypt from 'bcryptjs';
-import { PrismaClient } from '@prisma/client';
 import { z } from 'zod';
 import { generateToken } from '../utils/jwt';
 import { authMiddleware } from '../middleware/auth';
+import { prisma } from '../utils/prisma';
 
 const router = Router();
-const prisma = new PrismaClient();
 
 // ============================================
 // 注册
diff --git a/src/routes/favorites.ts b/src/routes/favorites.ts
index 729c784..1319121 100644
--- a/src/routes/favorites.ts
+++ b/src/routes/favorites.ts
@@ -1,10 +1,9 @@
 import { Router, Request, Response } from 'express';
-import { PrismaClient } from '@prisma/client';
 import { z } from 'zod';
 import { authMiddleware } from '../middleware/auth';
+import { prisma } from '../utils/prisma';
 
 const router = Router();
-const prisma = new PrismaClient();
 
 router.use(authMiddleware);
 
diff --git a/src/routes/filters.ts b/src/routes/filters.ts
index 583262a..4ba36eb 100644
--- a/src/routes/filters.ts
+++ b/src/routes/filters.ts
@@ -1,9 +1,8 @@
 import { Router, Request, Response } from 'express';
-import { PrismaClient } from '@prisma/client';
 import { authMiddleware, optionalAuth } from '../middleware/auth';
+import { prisma } from '../utils/prisma';
 
 const router = Router();
-const prisma = new PrismaClient();
 
 // ============================================
 // 获取滤镜列表
diff --git a/src/routes/schemes.ts b/src/routes/schemes.ts
index 4243b3e..eb51afc 100644
--- a/src/routes/schemes.ts
+++ b/src/routes/schemes.ts
@@ -1,11 +1,10 @@
 import { Router, Request, Response } from 'express';
-import { PrismaClient } from '@prisma/client';
 import { z } from 'zod';
 import { authMiddleware, optionalAuth } from '../middleware/auth';
 import { encrypt } from '../utils/encryption';
+import { prisma } from '../utils/prisma';
 
 const router = Router();
-const prisma = new PrismaClient();
 
 // ============================================
 // 获取方案列表
diff --git a/src/routes/schemesAob.ts b/src/routes/schemesAob.ts
index 5ca7618..fd2955a 100644
--- a/src/routes/schemesAob.ts
+++ b/src/routes/schemesAob.ts
@@ -1,10 +1,9 @@
 import { Router, Request, Response } from 'express';
-import { PrismaClient } from '@prisma/client';
 import { authMiddleware, optionalAuth } from '../middleware/auth';
 import { encrypt } from '../utils/encryption';
+import { prisma } from '../utils/prisma';
 
 const router = Router();
-const prisma = new PrismaClient();
 
 // ============================================
 // 获取全面战场方案列表
diff --git a/src/routes/user.ts b/src/routes/user.ts
index 1f43c15..a7ccc92 100644
--- a/src/routes/user.ts
+++ b/src/routes/user.ts
@@ -1,10 +1,9 @@
 import { Router, Request, Response } from 'express';
-import { PrismaClient } from '@prisma/client';
 import { z } from 'zod';
 import { authMiddleware } from '../middleware/auth';
+import { prisma } from '../utils/prisma';
 
 const router = Router();
-const prisma = new PrismaClient();
 
 // 所有路由都需要认证
 router.use(authMiddleware);
diff --git a/src/routes/vip.ts b/src/routes/vip.ts
index 491c412..182b3bb 100644
--- a/src/routes/vip.ts
+++ b/src/routes/vip.ts
@@ -1,12 +1,11 @@
 import { Router, Request, Response } from 'express';
-import { PrismaClient } from '@prisma/client';
 import crypto from 'crypto';
 import { z } from 'zod';
 import { authMiddleware } from '../middleware/auth';
 import { generateToken } from '../utils/jwt';
+import { prisma } from '../utils/prisma';
 
 const router = Router();
-const prisma = new PrismaClient();
 
 function hashCardKey(raw: string): string {
   return crypto.createHash('sha256').update(raw).digest('hex');
diff --git a/src/utils/encryption.ts b/src/utils/encryption.ts
index 0ce4f13..8b7c269 100644
--- a/src/utils/encryption.ts
+++ b/src/utils/encryption.ts
@@ -1,7 +1,15 @@
 import crypto from 'crypto';
 
 const ALGORITHM = 'aes-256-cbc';
-const ENCRYPTION_KEY = process.env.ENCRYPTION_KEY || '0123456789abcdef0123456789abcdef';
+const KEY = (() => {
+  const raw = process.env.ENCRYPTION_KEY || '0123456789abcdef0123456789abcdef';
+  const buf = Buffer.from(raw, 'utf-8');
+  if (buf.length !== 32) {
+    console.error(`ENCRYPTION_KEY must be exactly 32 bytes, got ${buf.length}`);
+    process.exit(1);
+  }
+  return buf;
+})();
 
 export interface EncryptedData {
   encrypted: boolean;
@@ -14,9 +22,7 @@ export interface EncryptedData {
  */
 export function encrypt(text: string): EncryptedData {
   const iv = crypto.randomBytes(16);
-  const key = Buffer.from(ENCRYPTION_KEY, 'utf-8');
-  
-  const cipher = crypto.createCipheriv(ALGORITHM, key, iv);
+  const cipher = crypto.createCipheriv(ALGORITHM, KEY, iv);
   let encrypted = cipher.update(text, 'utf-8', 'hex');
   encrypted += cipher.final('hex');
   
@@ -33,9 +39,7 @@ export function encrypt(text: string): EncryptedData {
 export function decrypt(ivHex: string, dataHex: string): string {
   const iv = Buffer.from(ivHex, 'hex');
   const encryptedData = Buffer.from(dataHex, 'hex');
-  const key = Buffer.from(ENCRYPTION_KEY, 'utf-8');
-  
-  const decipher = crypto.createDecipheriv(ALGORITHM, key, iv);
+  const decipher = crypto.createDecipheriv(ALGORITHM, KEY, iv);
   let decrypted = decipher.update(encryptedData, undefined, 'utf-8');
   decrypted += decipher.final('utf-8');
   
diff --git a/src/utils/prisma.ts b/src/utils/prisma.ts
new file mode 100644
index 0000000..5aa98b4
--- /dev/null
+++ b/src/utils/prisma.ts
@@ -0,0 +1,7 @@
+import { PrismaClient } from '@prisma/client';
+
+const globalForPrisma = globalThis as unknown as { prisma: PrismaClient };
+
+export const prisma = globalForPrisma.prisma || new PrismaClient();
+
+if (process.env.NODE_ENV !== 'production') globalForPrisma.prisma = prisma;