UPDATE

account/management/__init__.py

@@ -0,0 +1 @@
+

account/management/commands/__init__.py

@@ -0,0 +1 @@
+

account/management/commands/seed_admin_user.py

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+from django.core.management.base import BaseCommand, CommandError
+
+from account.seeds import ADMIN_USER_DATA, seed_admin_user
+
+
+class Command(BaseCommand):
+    help = "Create or update the default admin user."
+
+    def handle(self, *args, **options):
+        try:
+            user, created = seed_admin_user()
+        except ValueError as exc:
+            raise CommandError(str(exc)) from exc
+
+        action = "created" if created else "updated"
+        self.stdout.write(
+            self.style.SUCCESS(
+                f"Admin user {action}: username={user.username}, email={user.email}, "
+                f"phone_number={user.phone_number}, password={ADMIN_USER_DATA['password']}"
+            )
+        )

account/seeds.py

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+from django.contrib.auth import get_user_model
+from django.db import transaction
+from django.db.models import Q
+
+
+ADMIN_USER_DATA = {
+    "username": "admin",
+    "email": "admin@example.com",
+    "phone_number": "0912345678",
+    "first_name": "admin",
+    "last_name": "admin",
+    "password": "admin123456",
+}
+
+
+@transaction.atomic
+def seed_admin_user():
+    user_model = get_user_model()
+    lookup = (
+        Q(username=ADMIN_USER_DATA["username"])
+        | Q(email=ADMIN_USER_DATA["email"])
+        | Q(phone_number=ADMIN_USER_DATA["phone_number"])
+    )
+    matched_users = list(user_model.objects.filter(lookup).order_by("id"))
+
+    if len(matched_users) > 1:
+        raise ValueError(
+            "Multiple users matched the admin seeder lookup. Resolve duplicates before seeding."
+        )
+
+    created = not matched_users
+    user = matched_users[0] if matched_users else user_model()
+    user.username = ADMIN_USER_DATA["username"]
+    user.email = ADMIN_USER_DATA["email"]
+    user.phone_number = ADMIN_USER_DATA["phone_number"]
+    user.first_name = ADMIN_USER_DATA["first_name"]
+    user.last_name = ADMIN_USER_DATA["last_name"]
+    user.is_staff = True
+    user.is_superuser = True
+    user.is_active = True
+    user.set_password(ADMIN_USER_DATA["password"])
+    user.save()
+
+    return user, created