improve image hashing

longs/migrations/0012_longseriesimage_image_blake3_hash.py

@@ -0,0 +1,18 @@
+# Generated by Django 4.1.4 on 2023-12-26 16:06
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('longs', '0011_longseries_modified_longseriesimage_removed'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='longseriesimage',
+            name='image_blake3_hash',
+            field=models.CharField(blank=True, max_length=32, null=True),
+        ),
+    ]