fix

submission/migrations/0003_add_contest_create_time_idx.py

@@ -0,0 +1,19 @@
+# Generated by Django 6.0 on 2026-03-09 13:06
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('contest', '0001_initial'),
+        ('problem', '0005_remove_spj_fields'),
+        ('submission', '0002_submission_user_create_time_idx'),
+    ]
+
+    operations = [
+        migrations.AddIndex(
+            model_name='submission',
+            index=models.Index(fields=['contest_id', '-create_time'], name='contest_create_time_idx'),
+        ),
+    ]