Edit file File name : 20201202144329_AddEstimatedReadingTime.php Content :<?php namespace Yoast\WP\SEO\Config\Migrations; use Yoast\WP\Lib\Migrations\Migration; use Yoast\WP\Lib\Model; /** * AddEstimatedReadingTime class. */ class AddEstimatedReadingTime extends Migration { /** * The plugin this migration belongs to. * * @var string */ public static $plugin = 'free'; /** * Migration up. * * @return void */ public function up() { $table_name = $this->get_table_name(); $this->add_column( $table_name, 'estimated_reading_time_minutes', 'integer', [ 'null' => true, 'default' => null, ] ); } /** * Migration down. * * @return void */ public function down() { $table_name = $this->get_table_name(); $this->remove_column( $table_name, 'estimated_reading_time_minutes' ); } /** * Retrieves the table name to use. * * @return string The table name to use. */ protected function get_table_name() { return Model::get_table_name( 'Indexable' ); } } Save