Skeleton for data migration

src/backend/InvenTree/common/migrations/0045_auto_20260525_0956.py

@@ -0,0 +1,59 @@
+# Generated by Django 5.2.14 on 2026-05-25 09:56
+
+from tqdm import tqdm
+
+from django.db import migrations
+
+
+def migrate_notes(apps, schema_editor):
+    """Migrate existing notes to the new Note model."""
+
+    # New target models
+    Note = apps.get_model('common', 'Note')
+    NotesImage = apps.get_model('common', 'NotesImage')
+
+    for app, model in [
+        ('build', 'Build'),
+        ('company', 'Company'),
+        ('company', 'ManufacturerPart'),
+        ('company', 'SupplierPart'),
+        ('order', 'PurchaseOrder'),
+        ('order', 'ReturnOrder'),
+        ('order', 'SalesOrder'),
+        ('order', 'TransferOrder'),
+        ('part', 'Part'),
+        ('stock', 'StockItem'),
+    ]:
+        # Find old model which contains the 'notes' field
+        OldModel = apps.get_model(app, model)
+        with_notes = OldModel.objects.exclude(notes__isnull=True).exclude(notes='')
+
+        if not with_notes.exists():
+            continue
+
+        progress = tqdm(total=with_notes.count(), desc=f'Migrating notes for {app}.{model}')
+
+        for obj in with_notes:
+            # TODO ...
+
+            progress.update(1)
+
+
+class Migration(migrations.Migration):
+
+    # Ensure that each app which supports 'notes' is up-to-date first
+    dependencies = [
+        ("build", "0058_buildline_consumed"),
+        ("common", "0044_note"),
+        ("company", "0079_auto_20260212_1054"),
+        ("order", "0119_transferorderlineitem_line_int"),
+        ("part", "0150_part_maximum_stock"),
+        ("stock", "0119_alter_stockitemtestresult_date")
+    ]
+
+    operations = [
+        migrations.RunPython(
+            code=migrate_notes,
+            reverse_code=migrations.RunPython.noop,
+        )
+    ]