wp_delete_signup_on_user_delete()

wp_delete_signup_on_user_delete( int $id, int|null $reassign, WP_User $user )

function wp_delete_signup_on_user_delete( $id, $reassign, $user ) {
	global $wpdb;

	$wpdb->delete( $wpdb->signups, array( 'user_login' => $user->user_login ) );
}