code clean in storage.js

lib/storage.js

@@ -22,7 +22,7 @@ var Storage = function(opts) {
 };
 
 var zeroPad = function(x, length) {
-  return (Array(length).join('0') + parseInt(x)).slice(-length);
+  return _.padLeft(parseInt(x), length, '0');
 };
 
 var walletPrefix = function(id) {
@@ -33,7 +33,8 @@ var opKey = function(key) {
   return key ? '!' + key : '';
 };
 
-var MAX_TS = Array(14).join('9');
+var MAX_TS = _.repeat('9', 14);
+
 var opKeyTs = function(key) {
   return key ? '!' + zeroPad(key, 14) : '';
 };
@@ -106,16 +107,6 @@ Storage.prototype.fetchCopayerLookup = function(copayerId, cb) {
   });
 };
 
-Storage.prototype.fetchNotification = function(walletId, notificationId, cb) {
-  this.db.get(KEY.NOTIFICATION(walletId, notificationId), function(err, data) {
-    if (err) {
-      if (err.notFound) return cb();
-      return cb(err);
-    }
-    return cb(null, Notification.fromObj(data));
-  });
-};
-
 Storage.prototype._completeTxData = function(walletId, txs, cb) {
   var txList = [].concat(txs);
   this.fetchWallet(walletId, function(err, wallet) {