feat: 批次关系链时创建新批次支持使用已有批次号2

apps/wpm/migrations/0112_auto_20250422_1430.py

@@ -0,0 +1,27 @@
+# Generated by Django 3.2.12 on 2025-04-22 06:30
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('wpm', '0111_auto_20250422_0912'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='batchst',
+            name='version',
+            field=models.IntegerField(db_index=True, default=1, verbose_name='版本号'),
+        ),
+        migrations.AlterField(
+            model_name='batchst',
+            name='batch',
+            field=models.TextField(db_index=True, verbose_name='批次号'),
+        ),
+        migrations.AlterUniqueTogether(
+            name='batchst',
+            unique_together={('batch', 'version')},
+        ),
+    ]