title: How to use bigserial for primary key id with Sails js
body: <p>I have the following model definition:</p>
  
  <pre><code>module.exports = {
    attributes: {
      id: {
      type: 'bigserial',
      primaryKey: true
    },
    email: {
      type: 'email',
      required: true,
      unique: true
    }
  }
  </code></pre>
  
  <p>When I lifed sails, it didn't give me warning about "bigserial" data type, even though it is not officially documented.</p>
  
  <p>However, on the table created on Postgresql, the column "id" has a type "text". How do I have bigserial primary key?</p>