some changes

apps/herd/migrations/0011_rancher_herd_code.py

@@ -0,0 +1,18 @@
+# Generated by Django 5.0 on 2025-08-06 07:25
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('herd', '0010_rancher_without_herd'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='rancher',
+            name='herd_code',
+            field=models.CharField(max_length=100, null=True),
+        ),
+    ]