Add custom thumbnailer

src/pretix/helpers/models.py

@@ -0,0 +1,10 @@
+from django.db import models
+
+
+class Thumbnail(models.Model):
+    source = models.CharField(max_length=255)
+    size = models.CharField(max_length=255)
+    thumb = models.FileField(upload_to='pub/thumbs/')
+
+    class Meta:
+        unique_together = (('source', 'size'),)