Simplified the locking procedure

src/pretix/base/migrations/0014_auto_20150916_1319.py

@@ -0,0 +1,25 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0013_auto_20150916_0941'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='EventLock',
+            fields=[
+                ('event', models.CharField(primary_key=True, max_length=36, serialize=False)),
+                ('date', models.DateTimeField(auto_now=True)),
+            ],
+        ),
+        migrations.RemoveField(
+            model_name='quota',
+            name='locked',
+        ),
+    ]