fix some error

src/app/api/users/sync/route.ts

@@ -13,14 +13,16 @@ export async function POST() {
       return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
     }
 
-    // 检查用户是否已存在于Prisma数据库中
-    const existingUser = await prisma.user.findUnique({
+    // 先检查用户是否存在
+    let user = await prisma.user.findUnique({
       where: { id: supabaseUser.id }
     })
 
-    if (existingUser) {
+    let isNewUser = false
+
+    if (user) {
       // 用户已存在，更新信息
-      const updatedUser = await prisma.user.update({
+      user = await prisma.user.update({
         where: { id: supabaseUser.id },
         data: {
           email: supabaseUser.email!,
@@ -31,40 +33,68 @@ export async function POST() {
           updatedAt: new Date()
         }
       })
-      
-      return NextResponse.json({ 
-        message: 'User updated successfully', 
-        user: updatedUser 
-      })
     } else {
-      // 用户不存在，创建新用户
-      const newUser = await prisma.user.create({
+      // 用户不存在，需要创建
+      try {
+        user = await prisma.user.create({
           data: {
             id: supabaseUser.id,
             email: supabaseUser.email!,
             username: supabaseUser.user_metadata?.username || supabaseUser.user_metadata?.full_name || null,
             avatar: supabaseUser.user_metadata?.avatar_url || null,
             bio: supabaseUser.user_metadata?.bio || null,
-          language: supabaseUser.user_metadata?.language || 'en'
+            language: supabaseUser.user_metadata?.language || 'en',
+            subscriptionPlanId: 'free'
           }
         })
+        isNewUser = true
+      } catch (createError: unknown) {
+        // 如果是唯一约束错误，可能是并发创建导致的
+        const prismaError = createError as { code?: string }
+        if (prismaError.code === 'P2002') {
+          console.warn(`Concurrent user creation detected for ${supabaseUser.id}, fetching existing user`)
+          user = await prisma.user.findUnique({
+            where: { id: supabaseUser.id }
+          })
+          if (!user) {
+            throw createError // 如果还是找不到用户，重新抛出错误
+          }
+        } else {
+          throw createError
+        }
+      }
+    }
 
+    // isNewUser 变量已经在上面定义了
+
+    if (isNewUser) {
       // 为新用户添加系统赠送的5USD信用额度（1个月后过期）
       const expiresAt = new Date()
       expiresAt.setMonth(expiresAt.getMonth() + 1)
       
+      try {
         await addCredit(
-        newUser.id,
+          user.id,
           5.0,
           'system_gift',
           '系统赠送 - 新用户礼包',
           expiresAt
         )
+        console.log(`Added welcome credit for new user: ${user.id}`)
+      } catch (creditError) {
+        console.error('Failed to add welcome credit:', creditError)
+        // 不影响用户创建流程
+      }
 
       return NextResponse.json({ 
         message: 'User created successfully', 
-        user: newUser 
+        user 
       }, { status: 201 })
+    } else {
+      return NextResponse.json({ 
+        message: 'User updated successfully', 
+        user 
+      })
     }
 
   } catch (error) {