old_contents: var mongoose     = require('mongoose');
  var Schema       = mongoose.Schema;
  
  var ObjectId = mongoose.Schema.Types.ObjectId;
  var Organisation = require("./organisation_model");
  var Membership = require("./membership_model");
  var User = require("./user_model");
  var Location = require("./location_model");
  var Claytag = require("./claytag_model");
  var diff = require('deep-diff').diff;
  var Log = require("./log_model");
  
  var LicenseSchema   = new Schema({
  	organisation_id: { type: ObjectId, ref: 'Organisation', index: true, required: true },
  	membership_id: { type: ObjectId, ref: 'Membership', required: true },
  	location_id: { type: ObjectId, ref: 'Location', required: true },
  	xero_account: String,
  	user_id: { type: ObjectId, ref: 'User', index: true },
  	claytag_id: { type: ObjectId, ref: "Claytag" },
  	date_created: { type: Date, default: Date.now },
  	_owner_id: ObjectId,
  	_deleted: { type: Boolean, default: false, index: true },
  });
  
  LicenseSchema.set("_perms", {
  	admin: "crud",
  	primary_member: "ru",
  	user: "r"
  });
  
  /*
   * Log changes
   */
  LicenseSchema.post('validate', function(doc) {
  	console.log("Validating");
  	var self = this;
  	var log = null;
  	var LicenseModel = mongoose.model('License', LicenseSchema);
  	LicenseModel.findOne({ _id: doc._id }, function(err, original) {
  		if (!original) {
  			log = new Log({
  				id: doc._id,
  				model: "license",
  				level: 3,
  				user_id: self.__user,
  				title: "License created",
  				message: "License created",
  				code: "license-create",
  				data: doc,
  			}).save();
  		} else {
  			var d = diff(original.toObject(), doc.toObject());
  			if (d) {
  				log = new Log({
  					id: doc._id,
  					model: "license",
  					level: 3,
  					user_id: self.__user,
  					title: "License changed",
  					message: "License changed",
  					code: "license-change",
  					data: d,
  				}).save();
  			}
  		}
  	});
  });
  
  module.exports = mongoose.model('License', LicenseSchema);
new_contents: var mongoose     = require('mongoose');
  var Schema       = mongoose.Schema;
  
  var ObjectId = mongoose.Schema.Types.ObjectId;
  var Organisation = require("./organisation_model");
  var Membership = require("./membership_model");
  var User = require("./user_model");
  var Location = require("./location_model");
  var Claytag = require("./claytag_model");
  var diff = require('deep-diff').diff;
  var Log = require("./log_model");
  
  var LicenseSchema   = new Schema({
  	organisation_id: { type: ObjectId, ref: 'Organisation', index: true, required: true },
  	membership_id: { type: ObjectId, ref: 'Membership', required: true },
  	location_id: { type: ObjectId, ref: 'Location', required: true },
  	xero_account: String,
  	user_id: { type: ObjectId, ref: 'User', index: true },
  	claytag_id: { type: ObjectId, ref: "Claytag" },
  	date_created: { type: Date, default: Date.now },
  	_owner_id: ObjectId,
  	_deleted: { type: Boolean, default: false, index: true },
  });
  
  LicenseSchema.set("_perms", {
  	admin: "crud",
  	primary_member: "ru",
  	user: "r"
  });
  
  /*
   * Log changes
   */
  LicenseSchema.post('validate', function(doc) {
  	var self = this;
  	var log = null;
  	var LicenseModel = mongoose.model('License', LicenseSchema);
  	LicenseModel.findOne({ _id: doc._id }, function(err, original) {
  		if (!original) {
  			log = new Log({
  				id: doc._id,
  				model: "license",
  				level: 3,
  				user_id: self.__user,
  				title: "License created",
  				message: "License created",
  				code: "license-create",
  				data: doc,
  			}).save();
  		} else {
  			var d = diff(original.toObject(), doc.toObject());
  			if (d) {
  				log = new Log({
  					id: doc._id,
  					model: "license",
  					level: 3,
  					user_id: self.__user,
  					title: "License changed",
  					message: "License changed",
  					code: "license-change",
  					data: d,
  				}).save();
  			}
  		}
  	});
  });
  
  module.exports = mongoose.model('License', LicenseSchema);
subject: Remove useless log