diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 14f3cb7..fe972d3 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,7 +16,9 @@ jobs:
           --health-cmd pg_isready --health-interval 5s
           --health-timeout 5s --health-retries 10
     env:
-      DATABASE_URL: postgresql://postgres:ci-only-password@localhost:5432/traceiq
+      # Gitea act_runner 的 job 跑在容器里，与服务容器同网络：主机名必须用服务名
+      # postgres（GitHub 托管 runner 的 localhost 语义在这里连不通，勿改回）。
+      DATABASE_URL: postgresql://postgres:ci-only-password@postgres:5432/traceiq
       E2E_PASSWORD: CI-Test-Only-SecurePassword882!
       PYTHONPATH: .
     steps: