fix(identity-service): 修复 seed 脚本会清除所有用户数据的严重 bug

问题：每次部署 identity-service 时，seed 脚本会执行 deleteMany() 删除所有用户数据
修复：
- 检查现有用户数量，如果 > 5 则跳过 seed（保护生产数据）
- 移除所有 deleteMany() 调用
- 使用 upsert 确保系统账户存在而不是先删后建
- 管理员账户只在不存在时创建

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/services/identity-service/prisma/seed.ts

@@ -61,68 +61,78 @@ const SYSTEM_ACCOUNTS = [
 async function main() {
   console.log('Seeding database...');
 
-  // 清理现有数据
-  await prisma.deadLetterEvent.deleteMany();
-  await prisma.smsCode.deleteMany();
-  await prisma.userEvent.deleteMany();
-  await prisma.deviceToken.deleteMany();
-  await prisma.walletAddress.deleteMany();
-  await prisma.userDevice.deleteMany();
-  await prisma.userAccount.deleteMany();
+  // 检查是否已有用户数据，如果有则跳过 seed（防止数据丢失）
+  const existingUserCount = await prisma.userAccount.count();
+  if (existingUserCount > 5) {
+    console.log(`Database already has ${existingUserCount} users, skipping seed to prevent data loss.`);
+    console.log('Seed is only intended for initial database setup.');
+    return;
+  }
 
-  // 初始化账户序列号生成器 (新格式: D + YYMMDD + 5位序号)
-  await prisma.accountSequenceGenerator.deleteMany();
+  // 确保账户序列号生成器存在（不删除，使用 upsert）
   const today = new Date();
   const year = String(today.getFullYear()).slice(-2);
   const month = String(today.getMonth() + 1).padStart(2, '0');
   const day = String(today.getDate()).padStart(2, '0');
   const dateKey = `${year}${month}${day}`;
 
-  await prisma.accountSequenceGenerator.create({
-    data: {
-      id: 1,
-      dateKey: dateKey,
-      currentSequence: 0,
-    },
-  });
+  // 只有当序列号生成器不存在时才创建
+  const existingGenerator = await prisma.accountSequenceGenerator.findFirst();
+  if (!existingGenerator) {
+    await prisma.accountSequenceGenerator.create({
+      data: {
+        id: 1,
+        dateKey: dateKey,
+        currentSequence: 0,
+      },
+    });
+    console.log(`Initialized account sequence generator for date ${dateKey}`);
+  } else {
+    console.log(`Account sequence generator already exists (dateKey=${existingGenerator.dateKey}, seq=${existingGenerator.currentSequence})`);
+  }
 
-  // 创建系统账户
-  console.log('Creating system accounts...');
+  // 创建系统账户（使用 upsert，不会删除现有数据）
+  console.log('Ensuring system accounts exist...');
   for (const account of SYSTEM_ACCOUNTS) {
     await prisma.userAccount.upsert({
       where: { userId: account.userId },
-      update: account,
+      update: {
+        nickname: account.nickname,
+        referralCode: account.referralCode,
+        status: account.status,
+      },
       create: account,
     });
-    console.log(`  - Created system account: ${account.nickname} (accountSequence=${account.accountSequence})`);
+    console.log(`  - Ensured system account: ${account.nickname} (accountSequence=${account.accountSequence})`);
   }
 
-  // 创建管理员账户
-  console.log('Creating admin accounts...');
+  // 创建管理员账户（使用 upsert，不会删除现有数据）
+  console.log('Ensuring admin accounts exist...');
   for (const admin of ADMIN_ACCOUNTS) {
-    const passwordHash = await bcrypt.hash(admin.password, 10);
-    await prisma.adminAccount.upsert({
+    const existing = await prisma.adminAccount.findUnique({
       where: { email: admin.email },
-      update: {
-        passwordHash,
-        nickname: admin.nickname,
-        role: admin.role,
-      },
-      create: {
-        email: admin.email,
-        passwordHash,
-        nickname: admin.nickname,
-        role: admin.role,
-        status: 'ACTIVE',
-      },
     });
-    console.log(`  - Created admin account: ${admin.email} (role=${admin.role})`);
+
+    if (!existing) {
+      const passwordHash = await bcrypt.hash(admin.password, 10);
+      await prisma.adminAccount.create({
+        data: {
+          email: admin.email,
+          passwordHash,
+          nickname: admin.nickname,
+          role: admin.role,
+          status: 'ACTIVE',
+        },
+      });
+      console.log(`  - Created admin account: ${admin.email} (role=${admin.role})`);
+    } else {
+      console.log(`  - Admin account already exists: ${admin.email}`);
+    }
   }
 
-  console.log('Database seeded successfully!');
-  console.log(`- Initialized account sequence generator for date ${dateKey}`);
-  console.log(`- Created ${SYSTEM_ACCOUNTS.length} system accounts (S0000000001-S0000000005)`);
-  console.log(`- Created ${ADMIN_ACCOUNTS.length} admin accounts`);
+  console.log('Database seed completed successfully!');
+  console.log(`- System accounts ensured (${SYSTEM_ACCOUNTS.length})`);
+  console.log(`- Admin accounts ensured (${ADMIN_ACCOUNTS.length})`);
 }
 
 main()