progress on vendor database

persistence.lua

@@ -12,6 +12,10 @@ function private.get_dataset_key()
 	return private.realm..'|'..private.faction
 end
 
+function public.blizzard_boolean(bool)
+    return bool and 1 or nil
+end
+
 function public.load_dataset()
     local dataset_key = private.get_dataset_key()
     aux_datasets[dataset_key] = aux_datasets[dataset_key] or {}