refactor(db): 修复异步连接池无界增长，并完成 SQLAlchemy 2.0 迁移与分层归位 (#6320)

tests/test_subscribe_endpoint.py

@@ -654,13 +654,14 @@ class SubscribeEndpointTest(TestCase):
         """
         owner-aware 创建不应把他人已有订阅当作当前用户订阅。
         """
-        from app.db.subscribe_oper import SubscribeOper
+        from app.application.subscribe import async_add_subscribe
+        from app.db.oper.subscribe import SubscribeOper
 
         other = _EndpointSubscribe(id=21, username="bob")
         own = _EndpointSubscribe(id=22, username="alice")
         created = SimpleNamespace(async_create=AsyncMock())
 
-        with patch("app.db.subscribe_oper.Subscribe") as subscribe_model:
+        with patch("app.db.oper.subscribe.Subscribe") as subscribe_model:
             subscribe_model.async_exists = AsyncMock(return_value=other)
             subscribe_model.async_exists_by_username = AsyncMock(
                 side_effect=[None, own]
@@ -668,7 +669,8 @@ class SubscribeEndpointTest(TestCase):
             subscribe_model.return_value = created
 
             sid, message = asyncio.run(
-                SubscribeOper(db=object()).async_add(
+                async_add_subscribe(
+                    subscribe_oper=SubscribeOper(db=object()),
                     mediainfo=_EndpointMediaInfo(),
                     username="alice",
                     owner_scope=True,