仅商户整户额度可换号，并支持后台用户绑定固定收款商户。

Co-authored-by: Cursor <cursoragent@cursor.com>

peizhi/migrations/0023_user_wechat_mch_bind.py

@@ -0,0 +1,30 @@
+# Generated manually: UserWechatMchBind
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('peizhi', '0022_wechat_pay_mch_config'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='UserWechatMchBind',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('yonghuid', models.CharField(db_index=True, max_length=32, unique=True, verbose_name='用户ID')),
+                ('mch_id', models.CharField(db_index=True, max_length=32, verbose_name='绑定商户号')),
+                ('enabled', models.BooleanField(db_index=True, default=True, verbose_name='是否启用')),
+                ('remark', models.CharField(blank=True, default='', max_length=200, verbose_name='备注')),
+                ('create_time', models.DateTimeField(auto_now_add=True, verbose_name='创建时间')),
+                ('update_time', models.DateTimeField(auto_now=True, verbose_name='更新时间')),
+            ],
+            options={
+                'verbose_name': '用户转账商户绑定',
+                'verbose_name_plural': '用户转账商户绑定',
+                'db_table': 'user_wechat_mch_bind',
+            },
+        ),
+    ]