update only changed fields optimisation now done

core/models/wallets.py

@@ -329,7 +329,7 @@ class Wallet(models.Model):
             return None
         else:
             self.walletyear = datetime.date(year, 1, 1)
-            self.save()
+            self.save(update_fields=["walletdate"])
             return str(year)
 
     # Yes this is horribly, horribly inefficient, esp. for a page that have date, people and cave in it