change user_name still used as login and add display_name for dashboard view instead of username on login

backend/apps/jobs/management/commands/seed_demo.py

@@ -75,10 +75,10 @@ class Command(BaseCommand):
             defaults["managed_by"] = managed_by
 
         user, created = User.objects.get_or_create(
-            user_login=spec["user_name"],
+            user_name=spec["user_name"],
             defaults={
                 **defaults,
-                "user_name": spec["user_name"],
+                "display_name": spec["user_name"],
             },
         )
         user.status = spec["status"]
@@ -93,7 +93,7 @@ class Command(BaseCommand):
         role = spec["status"]
         if user.is_superuser:
             role = f"{role}+superuser"
-        link = f", managed_by={managed_by.user_name}" if managed_by else ""
+        link = f", managed_by={managed_by.display_name}" if managed_by else ""
         action = "Created" if created else "Updated"
         self.stdout.write(
             f"{action} user {spec['user_name']} / {spec['password']} ({role}{link})"
@@ -102,8 +102,8 @@ class Command(BaseCommand):
 
     def _remove_legacy_staff(self, gm: User) -> None:
         staff = (
-            User.objects.filter(user_login="staff").first()
-            or User.objects.filter(user_name="staff").first()
+            User.objects.filter(user_name="staff").first()
+            or User.objects.filter(display_name="staff").first()
         )
         if not staff:
             return