duration can be blank

alkatorapi/migrations/0003_alter_user_duration.py

@@ -0,0 +1,18 @@
+# Generated by Django 4.2.7 on 2024-03-12 20:07
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('alkatorapi', '0002_user_date_of_birth'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='user',
+            name='duration',
+            field=models.DurationField(blank=True, null=True),
+        ),
+    ]