create_order_transactions: Make suitable for large datasets

src/pretix/base/management/commands/create_order_transactions.py

@@ -53,8 +53,17 @@ class Command(BaseCommand):
             require_approval=False,
         ).prefetch_related(
             'all_positions', 'all_fees'
+        ).order_by(
+            'pk'
         )
-        for o in tqdm(qs):
+        last_pk = 0
+        with tqdm(total=qs.count()) as pbar:
+            while True:
+                batch = list(qs.filter(pk__gt=last_pk)[:5000])
+                if not batch:
+                    break
+
+                for o in batch:
                     if o.last_transaction is None:
                         tn = o.create_transactions(
                             positions=o.all_positions.all(),
@@ -79,6 +88,8 @@ class Command(BaseCommand):
                         )
                     if tn:
                         t += 1
-            time.sleep(options.get('slowdown', 0) / 1000)
+                    time.sleep(0)
+                    pbar.update(1)
+                last_pk = batch[-1].pk
 
         self.stderr.write(self.style.SUCCESS(f'Created transactions for {t} orders.'))