[IMP] shopinvader_cart_expiry: improve job

Improve the job in charge of unlink old carts by adding an identity key (to avoid having too much jobs who are doing the same cleaning on the same backend)

shopinvader_cart_expiry/models/shopinvader_backend.py

@@ -35,7 +35,10 @@ def _scheduler_manage_cart_expiry(self, domain=False):
         domain = expression.AND([domain, [("cart_expiry_delay", ">", 0)]])
         for backend in self.search(domain):
             description = _("Manage cart expired for backend %s") % backend.name
-            backend.with_delay(description=description).manage_cart_expiry()
+            backend.with_delay(
+                description=description,
+                identity_key="shopinvader_manage_cart_expiry_%s" % (str(backend.id),),
+            ).manage_cart_expiry()
 
     def _get_cart_expiry_delay_domain(self):
         expiry_date = fields.Datetime.from_string(fields.Datetime.now())