diff --git a/contest/migrations/0013_auto_20151017_1511.py b/contest/migrations/0013_auto_20151017_1511.py
new file mode 100644
index 00000000..ba3b201f
--- /dev/null
+++ b/contest/migrations/0013_auto_20151017_1511.py
@@ -0,0 +1,64 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+import utils.models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('contest', '0012_auto_20151008_1124'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='contestproblemtestcase',
+            name='problem',
+        ),
+        migrations.RemoveField(
+            model_name='contestsubmission',
+            name='contest',
+        ),
+        migrations.RemoveField(
+            model_name='contestsubmission',
+            name='problem',
+        ),
+        migrations.RemoveField(
+            model_name='contestsubmission',
+            name='user',
+        ),
+        migrations.RemoveField(
+            model_name='contest',
+            name='mode',
+        ),
+        migrations.RemoveField(
+            model_name='contest',
+            name='show_user_submission',
+        ),
+        migrations.RemoveField(
+            model_name='contestproblem',
+            name='score',
+        ),
+        migrations.AddField(
+            model_name='contestproblem',
+            name='is_public',
+            field=models.BooleanField(default=False),
+        ),
+        migrations.AddField(
+            model_name='contestproblem',
+            name='last_update_time',
+            field=models.DateTimeField(null=True, blank=True),
+        ),
+        migrations.AlterField(
+            model_name='contestproblem',
+            name='hint',
+            field=utils.models.RichTextField(null=True, blank=True),
+        ),
+        migrations.DeleteModel(
+            name='ContestProblemTestCase',
+        ),
+        migrations.DeleteModel(
+            name='ContestSubmission',
+        ),
+    ]