修改导入顺序

app/utils/__init__.py

@@ -1,7 +1,25 @@
 """
 Utility functions package
 """
-from app.utils.db_helper import db_helper, PostgresSQLHelper
-from app.utils.thread_pool_manager import thread_pool_manager, ThreadPoolManager, block_main_thread
+
+
+def __getattr__(name):
+    """延迟导入，只在首次使用时才导入模块"""
+    if name in ('db_helper', 'PostgresSQLHelper'):
+        from app.utils.db_helper import db_helper, PostgresSQLHelper
+        return db_helper if name == 'db_helper' else PostgresSQLHelper
+    elif name in ('thread_pool_manager', 'ThreadPoolManager', 'block_main_thread'):
+        from app.utils.thread_pool_manager import (
+            thread_pool_manager,
+            ThreadPoolManager,
+            block_main_thread
+        )
+        if name == 'thread_pool_manager':
+            return thread_pool_manager
+        elif name == 'ThreadPoolManager':
+            return ThreadPoolManager
+        else:
+            return block_main_thread
+    raise AttributeError(f"module {__name__!r} has no attribute {name!r}")
 
 __all__ = ['db_helper', 'PostgresSQLHelper', 'thread_pool_manager', 'ThreadPoolManager', 'block_main_thread']