I suspect you don’t want to delete all your bookmarks… So if you want to select multiple bookmarks to help manage them, I’d say it would be more of a reasonable Contribute > Feature request 
Also, a reminder that though using rails command can be useful at times, it’s also dangerous as a tiny error can have disastrous effects. Backups should be mandatory in these cases, but you’d also have to wonder if you really want to go this way to achieve your goal 