Refs #273 -- Fix broken migration tree and timezone issues

src/pretix/base/migrations/0041_auto_20161019_1757.py

@@ -1,23 +0,0 @@
-# -*- coding: utf-8 -*-
-# Generated by Django 1.10.2 on 2016-10-19 17:57
-from __future__ import unicode_literals
-
-from django.db import migrations
-
-
-def forwards(apps, schema_editor):
-    Order = apps.get_model('pretixbase', 'Order')
-    for order in Order.objects.all():
-        order.expires = order.expires.replace(hour=23, minute=59, second=59)
-        order.save()
-
-
-class Migration(migrations.Migration):
-
-    dependencies = [
-        ('pretixbase', '0040_u2fdevice'),
-    ]
-
-    operations = [
-        migrations.RunPython(forwards)
-    ]

src/pretix/base/migrations/0042_order_expires.py

@@ -0,0 +1,31 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.2 on 2016-10-19 17:57
+from __future__ import unicode_literals
+
+import pytz
+from django.db import migrations
+from django.utils import timezone
+
+
+def forwards(apps, schema_editor):
+    Order = apps.get_model('pretixbase', 'Order')
+    EventSetting = apps.get_model('pretixbase', 'EventSetting')
+    etz = {
+        s['object_id']: s['value']
+        for s in EventSetting.objects.filter(key='timezone').values('object_id', 'value')
+    }
+    for order in Order.objects.all():
+        tz = pytz.timezone(etz.get(order.event_id, 'UTC'))
+        order.expires = order.expires.astimezone(tz).replace(hour=23, minute=59, second=59)
+        order.save()
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0041_auto_20161018_1654'),
+    ]
+
+    operations = [
+        migrations.RunPython(forwards)
+    ]