feat: settlement lineup

basic_info/models.py

@@ -439,6 +439,12 @@ class Customer(ModelBase):
     class Meta:
         verbose_name = '客户资料'
         verbose_name_plural = '客户资料'
+        constraints = [
+            models.UniqueConstraint(
+                fields=['merchant', 'name'],
+                name='uniq_customer_merchant_name',
+            ),
+        ]
         permissions = [
             ('view_all_customers', '查看所有客户资料'),
         ]