feat: added n-to-1 relation between sales_order_item and printing_job model

business/migrations/0018_alter_salesorderitem_printing_job.py

@@ -0,0 +1,20 @@
+# Generated by Django 5.2.8 on 2025-12-11 04:51
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('business', '0017_salesorderitem_printing_job'),
+        ('printing', '0022_printingjob_work_state'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='salesorderitem',
+            name='printing_job',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.PROTECT, related_name='sales_order_items', to='printing.printingjob', verbose_name='关联印染任务'),
+        ),
+    ]