修改导入顺序

app/core/rainfall_manager.py

@@ -6,7 +6,6 @@ import time
 from datetime import datetime
 from typing import Optional
 
-from app.utils import thread_pool_manager
 from app.utils.logger import get_logger
 
 
@@ -25,6 +24,8 @@ class RainfallManager:
         Args:
             query_time: 查询时间，默认为当前时间
         """
+        from app.utils import thread_pool_manager
+        
         if query_time is None:
             query_time = datetime.now()
         
@@ -55,6 +56,8 @@ class RainfallManager:
                 
                 # 如果ID为空（刚启动）或者改变，则生成降雨栅格
                 if self.last_max_id is None or max_id != self.last_max_id:
+                    from app.utils import thread_pool_manager
+                    
                     self.logger.info(f"检测到数据更新，旧ID: {self.last_max_id}, 新ID: {max_id}")
                     
                     # 提交栅格生成任务