#9 feat(Sale): add external_id field.

tienda_ilusion/don_confiao/models.py

@@ -105,6 +105,7 @@ class Sale(models.Model):
         related_name='Sales',
         null=True
     )
+    external_id = models.CharField(max_length=100, null=True, blank=True)
 
     def __str__(self):
         return f"{self.date} {self.customer}"