Seed and bootstrap users via user_login.

Co-authored-by: Cursor <cursoragent@cursor.com>

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

@@ -75,8 +75,11 @@ class Command(BaseCommand):
             defaults["managed_by"] = managed_by
 
         user, created = User.objects.get_or_create(
-            user_name=spec["user_name"],
-            defaults=defaults,
+            user_login=spec["user_name"],
+            defaults={
+                **defaults,
+                "user_name": spec["user_name"],
+            },
         )
         user.status = spec["status"]
         user.is_superuser = spec.get("is_superuser", False)
@@ -98,7 +101,10 @@ class Command(BaseCommand):
         return user
 
     def _remove_legacy_staff(self, gm: User) -> None:
-        staff = User.objects.filter(user_name="staff").first()
+        staff = (
+            User.objects.filter(user_login="staff").first()
+            or User.objects.filter(user_name="staff").first()
+        )
         if not staff:
             return
         moved_sites = Site.objects.filter(user=staff).update(user=gm)