统计分析模块更新，待测试，优化所有模块main.py文件，修复bug。

main.py

@@ -17,9 +17,10 @@ app.include_router(Teachers_API,tags=["teachers"])
 # app.include_router(StatCalc_API,tags=["StatCalc"])
 
 
-Base_all.metadata.create_all(bind=engine_all)
 
 if __name__ == "__main__":
+    Base_all.metadata.create_all(bind=engine_all)
+
     def main():
         print("Hello from student-manage-system!")