perf: 优化订阅处理，形成框架

apps/common/db/utils.py

@@ -1,6 +1,9 @@
-from common.utils import get_logger
+from contextlib import contextmanager
+
 from django.db import connections
 
+from common.utils import get_logger
+
 logger = get_logger(__file__)
 
 
@@ -44,3 +47,10 @@ def get_objects(model, pks):
 def close_old_connections():
     for conn in connections.all():
         conn.close_if_unusable_or_obsolete()
+
+
+@contextmanager
+def safe_db_connection():
+    close_old_connections()
+    yield
+    close_old_connections()