text: const moment = require('moment');
  const { createTimeFormat } = require('../constants');
  const db = require('../utils/db');
  
  module.exports = db.defineModel('tags', {
      title: {
          type: db.STRING,
          allowNull: false,
          unique: true,
      },
      alias: db.STRING,
      create_time: {
          type: db.STRING,
          allowNull: false,
          defaultValue: moment().format(createTimeFormat),
      }
  });