diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d64f6bf..de9133b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -42,6 +42,11 @@ jobs:
           pip install black isort flake8 pylint
           cd backend && pip install -r requirements.txt
 
+      - name: Auto-format with Black and isort
+        run: |
+          black backend/app
+          isort backend/app
+
       - name: Black – format check
         run: black --check backend/app
 
diff --git a/backend/app/main.py b/backend/app/main.py
index 4531a75..a138648 100644
--- a/backend/app/main.py
+++ b/backend/app/main.py
@@ -15,7 +15,7 @@ from app.core.database import Base, SessionLocal, engine
 from app.core.security import add_api_key, generate_api_key, require_admin_auth
 from app.middleware.security import SecurityHeadersMiddleware
 from app.models.mail_source import MailSource  # noqa: F401 – ensure table is registered
-from app.models.user import User  # noqa: F401 – ensure mapper is registered before UserDomain resolves "User"
+from app.models.user import User  # noqa: F401 – ensure User mapper is registered
 from app.services.imap_client import IMAPClient
 from app.services.report_store import ReportStore