no need to store 0 for all messages

for deleted and system, if its missing it defaults to 0

src/messaging/create.js

@@ -48,10 +48,12 @@ module.exports = function (Messaging) {
 			timestamp: timestamp,
 			fromuid: uid,
 			roomId: roomId,
-			deleted: 0,
-			system: data.system || 0,
 		};
 
+		if (data.system) {
+			message.system = data.system;
+		}
+
 		if (data.ip) {
 			message.ip = data.ip;
 		}