bbp_admin_repair_forum_meta()

function bbp_admin_repair_forum_meta() {
	global $wpdb;

	$statement = __( 'Recalculating the forum for each post … %s', 'buddyboss' );
	$result    = __( 'Failed!', 'buddyboss' );

	// First, delete everything.
	if ( is_wp_error( $wpdb->query( "DELETE FROM `$wpdb->postmeta` WHERE `meta_key` = '_bbp_forum_id';" ) ) )
		return array( 1, sprintf( $statement, $result ) );

	// Next, give all the topics with replies the ID their last reply.
	if ( is_wp_error( $wpdb->query( "INSERT INTO `$wpdb->postmeta` (`post_id`, `meta_key`, `meta_value`)
			( SELECT `forum`.`ID`, '_bbp_forum_id', `forum`.`post_parent`
			FROM `$wpdb->posts`
				AS `forum`
			WHERE `forum`.`post_type` = 'forum'
			GROUP BY `forum`.`ID` );" ) ) )
		return array( 2, sprintf( $statement, $result ) );

	// Next, give all the topics with replies the ID their last reply.
	if ( is_wp_error( $wpdb->query( "INSERT INTO `$wpdb->postmeta` (`post_id`, `meta_key`, `meta_value`)
			( SELECT `topic`.`ID`, '_bbp_forum_id', `topic`.`post_parent`
			FROM `$wpdb->posts`
				AS `topic`
			WHERE `topic`.`post_type` = 'topic'
			GROUP BY `topic`.`ID` );" ) ) )
		return array( 3, sprintf( $statement, $result ) );

	// Next, give all the topics with replies the ID their last reply.
	if ( is_wp_error( $wpdb->query( "INSERT INTO `$wpdb->postmeta` (`post_id`, `meta_key`, `meta_value`)
			( SELECT `reply`.`ID`, '_bbp_forum_id', `topic`.`post_parent`
			FROM `$wpdb->posts`
				AS `reply`
			INNER JOIN `$wpdb->posts`
				AS `topic`
				ON `reply`.`post_parent` = `topic`.`ID`
			WHERE `topic`.`post_type` = 'topic'
				AND `reply`.`post_type` = 'reply'
			GROUP BY `reply`.`ID` );" ) ) )
		return array( 4, sprintf( $statement, $result ) );

	// Complete results
	return array( 0, sprintf( $statement, __( 'Complete!', 'buddyboss' ) ) );
}