text: 
  exports.up = function(knex) {
      return knex.schema.createTable('post', function(table) {
          table.increments();
          table.string('source_id').notNullable();
          table.string('title').notNullable();
          table.string('description').notNullable();
          table.string('url').notNullable();
          table.string('banner_url').notNullable();
          table.string('tags').notNullable();
        })
    };
    
    exports.down = function(knex) {
      return knex.schema.dropTable('post');
    };