id_deal unique test

models/reporting/xero/schema.yml

@@ -296,6 +296,9 @@ models:
       - name: id_contact
         data_type: character varying
         description: Xero's unique identifier for the contact.
+        data_tests:
+          - not_null
+          - unique
 
       - name: account_number
         data_type: character varying
@@ -309,6 +312,8 @@ models:
 
           You can use this to find specific deal ids or even as a proxy bool to
           keep or remove deal id customers.
+        data_tests:
+          - unique
 
       - name: contact_name
         data_type: character varying