10 minutes chat history, limit of 20 messages

server/handlers/db.js

@@ -2,6 +2,8 @@ var mongo_db_cred = {config: 'mydb'};
 var mongojs = require('mongojs');
 var db = mongojs(mongo_db_cred.config);
 
+db.collection("chat_logs").createIndex({ "createdAt": 1 }, { expireAfterSeconds: 600 });
+
 db.on('connected', function(err) {
     console.log("connected");
 })