Thumbnails: Store creation date

src/pretix/helpers/migrations/0003_thumbnail_created.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.2.16 on 2022-11-21 17:22
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixhelpers', '0002_auto_20180320_1219'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='thumbnail',
+            name='created',
+            field=models.DateTimeField(auto_now_add=True, null=True),
+        ),
+    ]

src/pretix/helpers/models.py

@@ -29,6 +29,7 @@ class Thumbnail(models.Model):
     source = models.CharField(max_length=255)
     size = models.CharField(max_length=255)
     thumb = models.FileField(upload_to='pub/thumbs/', max_length=255)
+    created = models.DateTimeField(auto_now_add=True, null=True)
 
     class Meta:
         unique_together = (('source', 'size'),)