fix(migration): remove orgs dependency and preserve system rate sheet links

Author: danh91

modules/core/karrio/server/providers/migrations/0106_system_rate_sheet.py

@@ -64,8 +64,9 @@ def migrate_system_rate_sheets(apps, schema_editor):
     if migrated_count:
         print(f"\n  Migrated {migrated_count} system rate sheet(s) to SystemRateSheet table")
 
-    # Delete all migrated rows from the old RateSheet table
-    RateSheet.objects.filter(id__in=all_ids).delete()
+    # DO NOT delete here — deleting before the FK switch in 0107 triggers
+    # on_delete=SET_NULL and nulls SystemConnection.rate_sheet_id. Cleanup
+    # runs in 0109_cleanup_legacy_system_rate_sheets after the FK transition.
 
 
 class Migration(migrations.Migration):

modules/core/karrio/server/providers/migrations/0109_cleanup_legacy_system_rate_sheets.py

@@ -0,0 +1,37 @@
+from django.db import migrations
+
+
+def cleanup_legacy_system_rate_sheets(apps, schema_editor):
+    """Delete legacy RateSheet rows that were migrated to SystemRateSheet.
+
+    Runs after providers.0107 switches SystemConnection.rate_sheet FK to
+    SystemRateSheet, so deleting legacy rows cannot null SystemConnection FK.
+    Also runs after providers.0108 (DHL Parcel DE credential cleanup).
+    """
+    RateSheet = apps.get_model("providers", "RateSheet")
+    SystemRateSheet = apps.get_model("providers", "SystemRateSheet")
+
+    system_ids = list(SystemRateSheet.objects.values_list("id", flat=True))
+    if not system_ids:
+        return
+
+    deleted, _ = RateSheet.objects.filter(id__in=system_ids).delete()
+    if deleted:
+        print(
+            f"\n  Cleanup: deleted {deleted} legacy RateSheet row(s) "
+            f"migrated to SystemRateSheet"
+        )
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("providers", "0108_clear_dhl_parcel_de_username_password"),
+    ]
+
+    operations = [
+        migrations.RunPython(
+            cleanup_legacy_system_rate_sheets,
+            reverse_code=migrations.RunPython.noop,
+        ),
+    ]