修改了Chrome配置文件清理功能

每次运行的时候都会查看配置文件中文件的大小，超过50MB自动清理
暴露最重要的用户登录信息。

backend/handlers/Rankings/rank_data_scraper.py

@@ -97,6 +97,8 @@ class DouyinPlayVVScraper:
             logging.info('[定时器模式] 使用批量存储')
         
         self._cleanup_old_profiles()
+        # 智能清理Chrome缓存（仅当超过50MB时）
+        self._cleanup_chrome_cache_smart()
         self._setup_mongodb()
         self._load_image_cache()
 
@@ -221,6 +223,101 @@ class DouyinPlayVVScraper:
             logging.warning(f'清理Chrome进程时出错: {e}')
             return False
 
+    def _get_directory_size(self, directory_path):
+        """计算目录大小（MB）"""
+        total_size = 0
+        try:
+            for dirpath, dirnames, filenames in os.walk(directory_path):
+                for filename in filenames:
+                    filepath = os.path.join(dirpath, filename)
+                    try:
+                        total_size += os.path.getsize(filepath)
+                    except (OSError, FileNotFoundError):
+                        continue
+        except Exception as e:
+            logging.warning(f'计算目录大小时出错: {e}')
+        return total_size / (1024 * 1024)  # 转换为MB
+
+    def _cleanup_chrome_cache_smart(self, size_threshold_mb=50):
+        """智能清理Chrome配置文件缓存
+        
+        Args:
+            size_threshold_mb (int): 触发清理的大小阈值（MB），默认50MB
+        """
+        try:
+            script_dir = os.path.dirname(os.path.abspath(__file__))
+            profile_dir = os.path.join(script_dir, 'config', 'chrome_profile', 'douyin_persistent')
+            
+            if not os.path.exists(profile_dir):
+                logging.info('Chrome配置文件目录不存在，跳过缓存清理')
+                return False
+            
+            # 计算当前配置文件大小
+            current_size_mb = self._get_directory_size(profile_dir)
+            logging.info(f'Chrome配置文件当前大小: {current_size_mb:.2f} MB')
+            
+            # 检查是否超过阈值
+            if current_size_mb <= size_threshold_mb:
+                logging.info(f'配置文件大小 ({current_size_mb:.2f} MB) 未超过阈值 ({size_threshold_mb} MB)，跳过清理')
+                return False
+            
+            logging.info(f'配置文件大小 ({current_size_mb:.2f} MB) 超过阈值 ({size_threshold_mb} MB)，开始清理缓存...')
+            
+            # 定义需要清理的缓存目录和文件
+            cache_items = [
+                'Default/Cache',
+                'Default/Code Cache', 
+                'Default/GPUCache',
+                'Default/Service Worker/CacheStorage',
+                'Default/Service Worker/ScriptCache',
+                'Default/IndexedDB',
+                'Default/Local Storage',
+                'Default/Session Storage',
+                'Default/Web Data-journal',
+                'Default/History-journal',
+                'Default/Favicons-journal',
+                'GrShaderCache',
+                'optimization_guide_model_store',
+                'BrowserMetrics'
+            ]
+            
+            cleaned_size = 0
+            cleaned_items = 0
+            
+            for cache_item in cache_items:
+                cache_path = os.path.join(profile_dir, cache_item)
+                if os.path.exists(cache_path):
+                    try:
+                        # 计算要删除的大小
+                        if os.path.isdir(cache_path):
+                            item_size = self._get_directory_size(cache_path)
+                            shutil.rmtree(cache_path)
+                        else:
+                            item_size = os.path.getsize(cache_path) / (1024 * 1024)
+                            os.remove(cache_path)
+                        
+                        cleaned_size += item_size
+                        cleaned_items += 1
+                        logging.debug(f'已清理: {cache_item} ({item_size:.2f} MB)')
+                        
+                    except Exception as e:
+                        logging.warning(f'清理 {cache_item} 时出错: {e}')
+            
+            # 计算清理后的大小
+            final_size_mb = self._get_directory_size(profile_dir)
+            
+            logging.info(f'缓存清理完成:')
+            logging.info(f'  - 清理前大小: {current_size_mb:.2f} MB')
+            logging.info(f'  - 清理后大小: {final_size_mb:.2f} MB')
+            logging.info(f'  - 释放空间: {cleaned_size:.2f} MB')
+            logging.info(f'  - 清理项目: {cleaned_items} 个')
+            
+            return True
+            
+        except Exception as e:
+            logging.error(f'智能缓存清理失败: {e}')
+            return False
+
     def setup_driver(self):
         logging.info('初始化Chrome WebDriver (启用CDP网络日志)')