Closes #20954: Add indexes for GFKs (#21015)

netbox/virtualization/migrations/0052_gfk_indexes.py

@@ -0,0 +1,19 @@
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ('contenttypes', '0002_remove_content_type_name'),
+        ('dcim', '0225_gfk_indexes'),
+        ('extras', '0134_owner'),
+        ('tenancy', '0022_add_comments_to_organizationalmodel'),
+        ('users', '0015_owner'),
+        ('virtualization', '0051_add_comments_to_organizationalmodel'),
+    ]
+
+    operations = [
+        migrations.AddIndex(
+            model_name='cluster',
+            index=models.Index(fields=['scope_type', 'scope_id'], name='virtualizat_scope_t_fb3b6e_idx'),
+        ),
+    ]

netbox/virtualization/models/clusters.py

@@ -107,6 +107,9 @@ class Cluster(ContactsMixin, CachedScopeMixin, PrimaryModel):
                 name='%(app_label)s_%(class)s_unique__site_name'
             ),
         )
+        indexes = (
+            models.Index(fields=('scope_type', 'scope_id')),
+        )
         verbose_name = _('cluster')
         verbose_name_plural = _('clusters')