refactor: make subscription lifecycle events durable

tests/test_agent_delete_subscribe.py

@@ -0,0 +1,63 @@
+"""Agent 删除订阅工具的事务作用域委托测试。"""
+
+import asyncio
+from contextlib import asynccontextmanager
+from types import SimpleNamespace
+from unittest.mock import AsyncMock, patch
+
+from app.agent.tools.impl.delete_subscribe import DeleteSubscribeTool
+
+
+@asynccontextmanager
+async def _scope(value):
+    """把测试替身包装成工具使用的异步作用域。"""
+    yield value
+
+
+def test_agent_delete_subscribe_uses_transactional_delete_command():
+    """Agent 删除必须委托带 UoW/outbox 的应用命令，不能直接调用 Oper。"""
+    subscribe = SimpleNamespace(id=7, name="测试订阅", year="2026")
+    mutation = SimpleNamespace(get_accessible=AsyncMock(return_value=subscribe))
+    command = SimpleNamespace(execute=AsyncMock(return_value=True))
+
+    with patch(
+        "app.agent.tools.impl.delete_subscribe.get_subscription_mutation_scope",
+        side_effect=lambda: _scope(mutation),
+    ), patch(
+        "app.agent.tools.impl.delete_subscribe.get_delete_subscribe_scope",
+        side_effect=lambda: _scope(command),
+    ):
+        result = asyncio.run(
+            DeleteSubscribeTool(session_id="session-1", user_id="10001").run(
+                subscribe_id=7
+            )
+        )
+
+    assert result == "成功删除订阅：测试订阅 (2026)"
+    mutation.get_accessible.assert_awaited_once()
+    command.execute.assert_awaited_once()
+    subscribe_id, actor = command.execute.await_args.args
+    assert subscribe_id == 7
+    assert actor.is_superuser is True
+
+
+def test_agent_delete_subscribe_skips_command_when_record_is_missing():
+    """预读未命中时保持原有不存在提示，且不创建删除副作用。"""
+    mutation = SimpleNamespace(get_accessible=AsyncMock(return_value=None))
+    delete_scope = AsyncMock()
+
+    with patch(
+        "app.agent.tools.impl.delete_subscribe.get_subscription_mutation_scope",
+        side_effect=lambda: _scope(mutation),
+    ), patch(
+        "app.agent.tools.impl.delete_subscribe.get_delete_subscribe_scope",
+        delete_scope,
+    ):
+        result = asyncio.run(
+            DeleteSubscribeTool(session_id="session-1", user_id="10001").run(
+                subscribe_id=404
+            )
+        )
+
+    assert result == "订阅 ID 404 不存在"
+    delete_scope.assert_not_called()