fix(site): use explicit transactions for connectivity paths

tests/test_site_connectivity.py

@@ -0,0 +1,28 @@
+"""站点连通性测试链路的数据库回归测试。"""
+
+from app.chain.site import SiteChain
+from app.db.models.site import Site
+from app.db.models.sitestatistic import SiteStatistic
+
+
+def test_site_connectivity_records_result_without_injected_session(db, monkeypatch):
+    """默认站点端口完成测试后应提交统计，而不是对空会话调用 execute。"""
+    db.watermark(Site, SiteStatistic)
+    db.add(Site(
+        name="连通性测试站点",
+        domain="connectivity.test",
+        url="https://connectivity.test/",
+        is_active=True,
+    ))
+    monkeypatch.setattr(
+        SiteChain,
+        "_SiteChain__test",
+        lambda _self, _site: (True, "连接成功"),
+    )
+
+    status, message = SiteChain().test("https://connectivity.test/")
+
+    statistic = SiteStatistic.get_by_domain(db.session, "connectivity.test")
+    assert (status, message) == (True, "连接成功")
+    assert statistic.success == 1
+    assert statistic.lst_state == 0