I want to "save" my menus into transients. I want to update those when there's been any changes to the menus via the admin custom menus. I've looked for an action but can't see to find anything. Perhaps I missed the obvious?
do_action( 'wp_update_nav_menu', $menu_id, $menu_data );
Consequently, a nav menu is a custom post type, as are its menu items, so all of the usual hooks for publish/save/update/trash apply