Further SQL optimizations

src/pretix/base/migrations/0045_auto_20161108_1542.py

@@ -0,0 +1,30 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.2 on 2016-11-08 15:42
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0044_auto_20161101_1610'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='cartposition',
+            name='expires',
+            field=models.DateTimeField(db_index=True, verbose_name='Expiration date'),
+        ),
+        migrations.AlterField(
+            model_name='voucher',
+            name='redeemed',
+            field=models.BooleanField(db_index=True, default=False, verbose_name='Redeemed'),
+        ),
+        migrations.AlterField(
+            model_name='voucher',
+            name='valid_until',
+            field=models.DateTimeField(blank=True, db_index=True, null=True, verbose_name='Valid until'),
+        ),
+    ]