converted option operations to repository

src/entities/option.js

@@ -1,11 +1,18 @@
 "use strict";
 
 const Entity = require('./entity');
+const dateUtils = require('../services/date_utils');
 
 class Option extends Entity {
     static get tableName() { return "options"; }
     static get primaryKeyName() { return "name"; }
     static get syncedProperties() { return ["name", "value"]; }
+
+    beforeSaving() {
+        super.beforeSaving();
+
+        this.dateModified = dateUtils.nowDate();
+    }
 }
 
 module.exports = Option;