feat: enable local docker demo mode

backend/tests/test_provider_router.py

@@ -125,6 +125,70 @@ class TestProviderFailover:
                         data="测试",
                     )
 
+    @pytest.mark.asyncio
+    async def test_default_provider_skips_fk_backed_metrics(self):
+        """环境变量/default provider 没有 providers 表记录，不写带外键的指标表。"""
+        from app.services import provider_router
+
+        mock_result = StoryOutput(
+            mode="generated",
+            title="本地演示故事",
+            story_text="内容",
+            cover_prompt_suggestion="prompt",
+        )
+
+        class MockAdapter:
+            estimated_cost = 0.0
+
+            def __init__(self, config):
+                self.config = config
+
+            async def execute(self, **kwargs):
+                return mock_result
+
+        with patch.object(
+            provider_router,
+            "_get_providers_with_config",
+            new_callable=AsyncMock,
+        ) as mock_providers:
+            mock_providers.return_value = [("demo", AdapterConfig(api_key=""), None)]
+
+            with patch.object(provider_router.AdapterRegistry, "get", return_value=MockAdapter):
+                with patch.object(
+                    provider_router.health_checker,
+                    "is_healthy",
+                    new_callable=AsyncMock,
+                ) as mock_is_healthy:
+                    with patch.object(
+                        provider_router.metrics_collector,
+                        "record_call",
+                        new_callable=AsyncMock,
+                    ) as mock_record_call:
+                        with patch.object(
+                            provider_router.health_checker,
+                            "record_call_result",
+                            new_callable=AsyncMock,
+                        ) as mock_record_call_result:
+                            with patch.object(
+                                provider_router.cost_tracker,
+                                "record_cost",
+                                new_callable=AsyncMock,
+                            ) as mock_record_cost:
+                                result = await provider_router._route_with_failover(
+                                    "text",
+                                    db=AsyncMock(),
+                                    user_id="user-1",
+                                    input_type="keywords",
+                                    data="测试",
+                                )
+
+        assert result == mock_result
+        mock_is_healthy.assert_not_called()
+        mock_record_call.assert_not_called()
+        mock_record_call_result.assert_not_called()
+        mock_record_cost.assert_awaited_once()
+        assert mock_record_cost.await_args.kwargs["provider_id"] is None
+
 
 class TestProviderConfigFromDB:
     """从 DB 加载 provider 配置测试。"""
@@ -187,7 +251,10 @@ class TestProviderCacheStartup:
             mock_factory.return_value.__aenter__ = AsyncMock(return_value=mock_session)
             mock_factory.return_value.__aexit__ = AsyncMock()
 
-            with patch("app.services.provider_cache.reload_providers", new_callable=AsyncMock) as mock_reload:
+            with patch(
+                "app.services.provider_cache.reload_providers",
+                new_callable=AsyncMock,
+            ) as mock_reload:
                 mock_reload.return_value = {"text": [], "image": [], "tts": []}
 
                 await _load_provider_cache()