Edit file File name : 20191011111109_WpYoastIndexableHierarchy.php Content :<?php namespace Yoast\WP\SEO\Config\Migrations; use Yoast\WP\Lib\Migrations\Migration; use Yoast\WP\Lib\Model; /** * Class WpYoastIndexableHierarchy. */ class WpYoastIndexableHierarchy 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(); $indexable_table = $this->create_table( $table_name, [ 'id' => false ] ); $indexable_table->column( 'indexable_id', 'integer', [ 'primary_key' => true, 'unsigned' => true, 'null' => true, 'limit' => 11, ] ); $indexable_table->column( 'ancestor_id', 'integer', [ 'primary_key' => true, 'unsigned' => true, 'null' => true, 'limit' => 11, ] ); $indexable_table->column( 'depth', 'integer', [ 'unsigned' => true, 'null' => true, 'limit' => 11, ] ); $indexable_table->finish(); $this->add_index( $table_name, 'indexable_id', [ 'name' => 'indexable_id' ] ); $this->add_index( $table_name, 'ancestor_id', [ 'name' => 'ancestor_id' ] ); $this->add_index( $table_name, 'depth', [ 'name' => 'depth' ] ); } /** * Migration up. * * @return void */ public function down() { $this->drop_table( $this->get_table_name() ); } /** * Retrieves the table name to use. * * @return string The table name to use. */ protected function get_table_name() { return Model::get_table_name( 'Indexable_Hierarchy' ); } } Save