Add a data migration which deletes any stock items which have been scheduled for deletion.

Also deletes any instance of the "delete_old_stock_items" worker task

InvenTree/stock/migrations/0071_auto_20211205_1733.py

@@ -0,0 +1,47 @@
+# Generated by Django 3.2.5 on 2021-12-05 06:33
+
+from django.db import migrations
+
+import logging
+
+
+logger = logging.getLogger('inventree')
+
+
+def delete_scheduled(apps, schema_editor):
+    """
+    Delete all stock items which are marked as 'scheduled_for_deletion'.
+
+    The issue that this field was addressing has now been fixed,
+    and so we can all move on with our lives...
+    """
+
+    StockItem = apps.get_model('stock', 'stockitem')
+
+    items = StockItem.objects.filter(scheduled_for_deletion=True)
+
+    logger.info(f"Removing {items.count()} stock items scheduled for deletion")
+
+    items.delete()
+
+    Task = apps.get_model('django_q', 'schedule')
+
+    Task.objects.filter(func='stock.tasks.delete_old_stock_items').delete()
+
+
+def reverse(apps, schema_editor):
+    pass
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('stock', '0070_auto_20211128_0151'),
+    ]
+
+    operations = [
+        migrations.RunPython(
+            delete_scheduled,
+            reverse_code=reverse,
+        )
+    ]