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

@@ -42,6 +42,7 @@ except ImportError:
 
 # ==================== 数据模型 ====================
 
+
 @dataclass
 class CacheStats:
     """缓存统计数据模型"""
@@ -58,6 +59,7 @@ 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"""
@@ -70,6 +72,7 @@ class CacheEntry:
     last_accessed: float = 0
     size_bytes: int = 0
 
+
 @dataclass
 class PerformanceMetric:
     """性能指标数据模型"""
@@ -91,6 +94,7 @@ class PerformanceMetric:
             "metadata": self.metadata,
         }
 
+
 @dataclass
 class TaskInfo:
     """任务信息数据模型"""
@@ -122,6 +126,7 @@ class TaskInfo:
             "max_retries": self.max_retries,
         }
 
+
 @dataclass
 class ShardInfo:
     """分片信息数据模型"""
@@ -134,8 +139,10 @@ class ShardInfo:
     created_at: str = ""
     last_accessed: str = ""
 
+
 # ==================== Redis 缓存层 ====================
 
+
 class CacheManager:
     """
     缓存管理器
@@ -592,8 +599,10 @@ class CacheManager:
 
         return count
 
+
 # ==================== 数据库分片 ====================
 
+
 class DatabaseSharding:
     """
     数据库分片管理器
@@ -893,8 +902,10 @@ class DatabaseSharding:
             "message": "Rebalancing analysis completed",
         }
 
+
 # ==================== 异步任务队列 ====================
 
+
 class TaskQueue:
     """
     异步任务队列管理器
@@ -1276,8 +1287,10 @@ class TaskQueue:
             "backend": "celery" if self.use_celery else "memory",
         }
 
+
 # ==================== 性能监控 ====================
 
+
 class PerformanceMonitor:
     """
     性能监控器
@@ -1594,8 +1607,10 @@ class PerformanceMonitor:
 
         return deleted
 
+
 # ==================== 性能装饰器 ====================
 
+
 def cached(
     cache_manager: CacheManager,
     key_prefix: str = "",
@@ -1640,6 +1655,7 @@ def cached(
 
     return decorator
 
+
 def monitored(monitor: PerformanceMonitor, metric_type: str, endpoint: str | None = None) -> None:
     """
     性能监控装饰器
@@ -1667,8 +1683,10 @@ 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
@@ -1730,9 +1748,11 @@ 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: