Add database cache for quotas

src/pretix/base/migrations/0078_auto_20171003_1650.py

@@ -0,0 +1,40 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.5 on 2017-10-03 16:50
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0077_auto_20170829_1126'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='quota',
+            name='cached_availability_number',
+            field=models.PositiveIntegerField(blank=True, null=True),
+        ),
+        migrations.AddField(
+            model_name='quota',
+            name='cached_availability_state',
+            field=models.PositiveIntegerField(blank=True, null=True),
+        ),
+        migrations.AddField(
+            model_name='quota',
+            name='cached_availability_time',
+            field=models.DateTimeField(blank=True, null=True),
+        ),
+        migrations.AlterField(
+            model_name='eventmetaproperty',
+            name='default',
+            field=models.TextField(blank=True),
+        ),
+        migrations.AlterField(
+            model_name='taxrule',
+            name='eu_reverse_charge',
+            field=models.BooleanField(default=False, help_text='Not recommended. Most events will NOT be qualified for reverse charge since the place of taxation is the location of the event. This option disables charging VAT for all customers outside the EU and for business customers in different EU countries who entered a valid EU VAT ID. Only enable this option after consulting a tax counsel. No warranty given for correct tax calculation. USE AT YOUR OWN RISK.', verbose_name='Use EU reverse charge taxation rules'),
+        ),
+    ]