Simpler migration

kfet/migrations/0049_remove_checkout.py

@@ -6,13 +6,9 @@ from django.db import migrations, models
 
 def adapt_operation_types(apps, schema_editor):
     Operation = apps.get_model("kfet", "Operation")
-    edits = Operation.objects.filter(
+    Operation.objects.filter(
         is_checkout=False,
-        type__in=['withdraw', 'deposit'])
-
-    for ope in edits:
-        ope.type = 'edit'
-        ope.save()
+        type__in=['withdraw', 'deposit']).update(type='edit')
 
 
 def revert_operation_types(apps, schema_editor):