Round 4 fixes: scheduler DB save check, empty validation_targets, proxy list page fallback, scheduler frontend state sync, tests

tests/integration/test_settings_api.py

@@ -164,3 +164,22 @@ class TestSettingsAPI:
         response = await client.get("/api/settings")
         saved_settings = response.json()["data"]
         assert saved_settings["validation_targets"] == test_settings["validation_targets"]
+
+    @pytest.mark.asyncio
+    async def test_save_settings_empty_validation_targets(self, client):
+        """测试保存空的 validation_targets"""
+        response = await client.get("/api/settings")
+        current_settings = response.json()["data"]
+
+        new_settings = current_settings.copy()
+        new_settings["validation_targets"] = []
+
+        response = await client.post("/api/settings", json=new_settings)
+        assert response.status_code == 200
+        data = response.json()
+        assert data["data"]["validation_targets"] == []
+
+        # 读取确认
+        response = await client.get("/api/settings")
+        saved_settings = response.json()["data"]
+        assert saved_settings["validation_targets"] == []