chore: Add created_at field to Adventure and Collection models

backend/server/adventures/migrations/0010_adventure_created_at_collection_created_at.py

@@ -0,0 +1,26 @@
+# Generated by Django 5.0.6 on 2024-07-18 19:27
+
+import django.utils.timezone
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('adventures', '0009_alter_adventure_image'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='adventure',
+            name='created_at',
+            field=models.DateTimeField(auto_now_add=True, default=django.utils.timezone.now),
+            preserve_default=False,
+        ),
+        migrations.AddField(
+            model_name='collection',
+            name='created_at',
+            field=models.DateTimeField(auto_now_add=True, default=django.utils.timezone.now),
+            preserve_default=False,
+        ),
+    ]