text: ///////////////////////////////////////
  //  ESTRUCTURA DE LA BASES DE DATOS  //
  ///////////////////////////////////////
  
  // MySql
  
  drop table users;
  
  create table users (
    id INT not null AUTO_INCREMENT, 
    email VARCHAR(256) NOT NULL UNIQUE, 
    encrypted_password VARCHAR(1024) NOT NULL, 
    createdAt DATETIME, 
    updatedAt DATETIME, 
    primary key (id) );
  
  
  // PostgreSql
  
  drop table users;
  
  create table users (
    id SERIAL, 
    email VARCHAR(256) NOT NULL UNIQUE, 
    encrypted_password VARCHAR(1024) NOT NULL, 
    created_at timestamp, 
    updated_at timestamp, 
    primary key (id) );
  
  