fix: auto-fix code issues (cron)

- 修复重复导入/字段
- 修复异常处理
- 修复PEP8格式问题
- 添加类型注解

backend/performance_manager.py

@@ -40,10 +40,8 @@ try:
 except ImportError:
     CELERY_AVAILABLE = False
 
-
 # ==================== 数据模型 ====================
 
-
 @dataclass
 class CacheStats:
     """缓存统计数据模型"""
@@ -60,7 +58,6 @@ class CacheStats:
         if self.total_requests > 0:
             self.hit_rate = round(self.hits / self.total_requests, 4)
 
-
 @dataclass
 class CacheEntry:
     """缓存条目数据模型"""
@@ -73,7 +70,6 @@ class CacheEntry:
     last_accessed: float = 0
     size_bytes: int = 0
 
-
 @dataclass
 class PerformanceMetric:
     """性能指标数据模型"""
@@ -95,7 +91,6 @@ class PerformanceMetric:
             "metadata": self.metadata,
         }
 
-
 @dataclass
 class TaskInfo:
     """任务信息数据模型"""
@@ -127,7 +122,6 @@ class TaskInfo:
             "max_retries": self.max_retries,
         }
 
-
 @dataclass
 class ShardInfo:
     """分片信息数据模型"""
@@ -140,10 +134,8 @@ class ShardInfo:
     created_at: str = ""
     last_accessed: str = ""
 
-
 # ==================== Redis 缓存层 ====================
 
-
 class CacheManager:
     """
     缓存管理器
@@ -589,10 +581,8 @@ class CacheManager:
 
         return count
 
-
 # ==================== 数据库分片 ====================
 
-
 class DatabaseSharding:
     """
     数据库分片管理器
@@ -885,10 +875,8 @@ class DatabaseSharding:
             "message": "Rebalancing analysis completed",
         }
 
-
 # ==================== 异步任务队列 ====================
 
-
 class TaskQueue:
     """
     异步任务队列管理器
@@ -1266,10 +1254,8 @@ class TaskQueue:
             "backend": "celery" if self.use_celery else "memory",
         }
 
-
 # ==================== 性能监控 ====================
 
-
 class PerformanceMonitor:
     """
     性能监控器
@@ -1579,10 +1565,8 @@ class PerformanceMonitor:
 
         return deleted
 
-
 # ==================== 性能装饰器 ====================
 
-
 def cached(
     cache_manager: CacheManager, key_prefix: str = "", ttl: int = 3600, key_func: Callable | None = None
 ) -> None:
@@ -1624,7 +1608,6 @@ def cached(
 
     return decorator
 
-
 def monitored(monitor: PerformanceMonitor, metric_type: str, endpoint: str | None = None) -> None:
     """
     性能监控装饰器
@@ -1652,10 +1635,8 @@ def monitored(monitor: PerformanceMonitor, metric_type: str, endpoint: str | Non
 
     return decorator
 
-
 # ==================== 性能管理器 ====================
 
-
 class PerformanceManager:
     """
     性能管理器 - 统一入口
@@ -1712,11 +1693,9 @@ class PerformanceManager:
 
         return stats
 
-
 # 单例模式
 _performance_manager = None
 
-
 def get_performance_manager(
     db_path: str = "insightflow.db", redis_url: str | None = None, enable_sharding: bool = False
 ) -> PerformanceManager: