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/test_phase8_task4.py

@@ -13,7 +13,6 @@ from ai_manager import ModelType, PredictionType, get_ai_manager
 # Add backend directory to path
 sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
 
-
 def test_custom_model():
     """测试自定义模型功能"""
     print("\n=== 测试自定义模型 ===")
@@ -88,7 +87,6 @@ def test_custom_model():
 
     return model.id
 
-
 async def test_train_and_predict(model_id: str):
     """测试训练和预测"""
     print("\n=== 测试模型训练和预测 ===")
@@ -115,7 +113,6 @@ async def test_train_and_predict(model_id: str):
     except Exception as e:
         print(f"   预测失败: {e}")
 
-
 def test_prediction_models():
     """测试预测模型"""
     print("\n=== 测试预测模型 ===")
@@ -157,7 +154,6 @@ def test_prediction_models():
 
     return trend_model.id, anomaly_model.id
 
-
 async def test_predictions(trend_model_id: str, anomaly_model_id: str):
     """测试预测功能"""
     print("\n=== 测试预测功能 ===")
@@ -192,7 +188,6 @@ async def test_predictions(trend_model_id: str, anomaly_model_id: str):
     )
     print(f"   检测结果: {anomaly_result.prediction_data}")
 
-
 def test_kg_rag():
     """测试知识图谱 RAG"""
     print("\n=== 测试知识图谱 RAG ===")
@@ -222,7 +217,6 @@ def test_kg_rag():
 
     return rag.id
 
-
 async def test_kg_rag_query(rag_id: str):
     """测试 RAG 查询"""
     print("\n=== 测试知识图谱 RAG 查询 ===")
@@ -293,7 +287,6 @@ async def test_kg_rag_query(rag_id: str):
     except Exception as e:
         print(f"   查询失败: {e}")
 
-
 async def test_smart_summary():
     """测试智能摘要"""
     print("\n=== 测试智能摘要 ===")
@@ -341,7 +334,6 @@ async def test_smart_summary():
         except Exception as e:
             print(f"   生成失败: {e}")
 
-
 async def main():
     """主测试函数"""
     print("=" * 60)
@@ -380,6 +372,5 @@ async def main():
 
         traceback.print_exc()
 
-
 if __name__ == "__main__":
     asyncio.run(main())