diff --git a/app.py b/app.py
index 2c9f661..a8cca29 100644
--- a/app.py
+++ b/app.py
@@ -229,13 +229,8 @@ def upload_pdf():
         os.makedirs(output_dir, exist_ok=True)
         output_path = os.path.join(output_dir, f"{filename}_translated.md")
         
-        # 创建异步翻译任务
+        # 创建异步翻译任务（先不创建，等translation_id生成后）
         task_id = str(uuid.uuid4())
-        TranslationTask.create_task(
-            task_id, upload_path, output_path,
-            {'LLM_CONFIG': LLM_CONFIG},
-            instruction
-        )
     
     # 创建翻译记录
     translation = Translation(
@@ -252,6 +247,20 @@ def upload_pdf():
     )
     db.session.add(translation)
     
+    # 预先提交获取 translation_id
+    if not from_cache:
+        db.session.flush()  # 获取 ID 但不提交完整事务
+    
+    # 创建异步翻译任务（需要翻译时）
+    if not from_cache:
+        TranslationTask.create_task(
+            task_id, upload_path, output_path,
+            {'LLM_CONFIG': LLM_CONFIG},
+            instruction,
+            translation_id=translation.id,
+            app=app
+        )
+    
     # 更新用户/访客计数
     if user:
         user.increment_count()
diff --git a/models.py b/models.py
index 5e1898a..a4002b7 100644
--- a/models.py
+++ b/models.py
@@ -67,8 +67,10 @@ class User(db.Model):
         if max_pages > 0 and pages > max_pages:
             return False, f"PDF页数超出限制（最大{max_pages}页）"
         
-        # 检查每日次数限制
-        today = datetime.utcnow().date()
+        # 检查每日次数限制 - 使用上海时间（UTC+8）
+        from datetime import timezone, timedelta
+        shanghai_tz = timezone(timedelta(hours=8))
+        today = datetime.now(shanghai_tz).date()
         if self.last_translate_date != today:
             self.daily_count = 0
             self.last_translate_date = today
@@ -81,7 +83,9 @@ class User(db.Model):
     
     def increment_count(self):
         """增加翻译计数"""
-        today = datetime.utcnow().date()
+        from datetime import timezone, timedelta
+        shanghai_tz = timezone(timedelta(hours=8))
+        today = datetime.now(shanghai_tz).date()
         if self.last_translate_date != today:
             self.daily_count = 0
             self.last_translate_date = today
diff --git a/services.py b/services.py
index cb2af14..4b6a2ba 100644
--- a/services.py
+++ b/services.py
@@ -255,7 +255,7 @@ class TranslationTask:
     lock = threading.Lock()
     
     @classmethod
-    def create_task(cls, task_id, pdf_path, output_path, config, instruction=None):
+    def create_task(cls, task_id, pdf_path, output_path, config, instruction=None, translation_id=None, app=None):
         """创建翻译任务"""
         task = {
             'id': task_id,
@@ -266,6 +266,7 @@ class TranslationTask:
             'error': None,
             'started_at': None,
             'completed_at': None,
+            'translation_id': translation_id,
         }
         
         with cls.lock:
@@ -277,10 +278,28 @@ class TranslationTask:
             task['status'] = 'processing'
             task['started_at'] = datetime.now().isoformat()
             
+            # 更新数据库状态为 processing
+            if app and translation_id:
+                with app.app_context():
+                    from models import db, Translation
+                    trans = Translation.query.get(translation_id)
+                    if trans:
+                        trans.status = 'processing'
+                        db.session.commit()
+            
             def progress_callback(progress, total, message):
                 with cls.lock:
                     task['progress'] = progress
                     task['message'] = message
+                
+                # 更新数据库进度
+                if app and translation_id:
+                    with app.app_context():
+                        from models import db, Translation
+                        trans = Translation.query.get(translation_id)
+                        if trans:
+                            trans.progress = progress
+                            db.session.commit()
             
             try:
                 result = service.translate_pdf(
@@ -291,11 +310,32 @@ class TranslationTask:
                 task['message'] = '翻译完成'
                 task['completed_at'] = datetime.now().isoformat()
                 task['result'] = result
+                
+                # 更新数据库状态为 completed
+                if app and translation_id:
+                    with app.app_context():
+                        from models import db, Translation
+                        trans = Translation.query.get(translation_id)
+                        if trans:
+                            trans.status = 'completed'
+                            trans.progress = 100
+                            trans.completed_at = datetime.now()
+                            db.session.commit()
             
             except Exception as e:
                 task['status'] = 'failed'
                 task['error'] = str(e)
                 task['message'] = f'翻译失败: {e}'
+                
+                # 更新数据库状态为 failed
+                if app and translation_id:
+                    with app.app_context():
+                        from models import db, Translation
+                        trans = Translation.query.get(translation_id)
+                        if trans:
+                            trans.status = 'failed'
+                            trans.error_message = str(e)
+                            db.session.commit()
         
         thread = threading.Thread(target=run_translation)
         thread.start()