Refactor deleteCollection function to use DELETE method for API call; update endpoint to match new API structure.

backend/server/adventures/migrations/0030_set_end_date_equal_start.py

@@ -0,0 +1,19 @@
+# Generated by Django 5.2.1 on 2025-05-27 16:38
+
+from django.db import migrations
+
+def set_end_date_equal_to_start(apps, schema_editor):
+    Visit = apps.get_model('adventures', 'Visit')
+    for visit in Visit.objects.filter(end_date__isnull=True):
+        visit.end_date = visit.start_date
+        visit.save()
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('adventures', '0029_adventure_city_adventure_country_adventure_region'),
+    ]
+
+    operations = [
+        migrations.RunPython(set_end_date_equal_to_start),
+    ]