WordPress hooks for saving, trashing, restoring, and deleting custom fields in a custom post type

//Saving
add_action('save_post', 'custom_save_function');

//Trashing
add_action('wp_trash_post', 'custom_trash_function');

//Restoring
add_action('untrash_post', 'custom_restore_function');

//Deleting
add_action('delete_post', 'custom_delete_function');