Enhance adventure management: add error handling for category fetch, implement unique email constraint in user model, and update adventure save logic to ensure category assignment

backend/server/adventures/migrations/0014_alter_category_unique_together.py

@@ -0,0 +1,19 @@
+# Generated by Django 5.0.8 on 2024-11-17 21:43
+
+from django.conf import settings
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('adventures', '0013_remove_adventure_type_alter_adventure_category'),
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+    ]
+
+    operations = [
+        migrations.AlterUniqueTogether(
+            name='category',
+            unique_together={('name', 'user_id')},
+        ),
+    ]