Some (long) time ago, someone on irc suggested that I add option to keep track of optimizations of queries.
Sorry, I forgot your name, and the mails disappeared in some crash.
Anyway – right now, when you are on some plan page, you can press “Add optimization" button, and you will be redirected to index page, but when you will add plan there, it will be understood to be plan from optimization of the query. Like this one.
You can have any number of optimizations per plan, and when viewing plan that has optimizations, or is an optimization of earlier plan – you will see this above plan table.
Whether you'll use it – it's up to you. Someone wanted it, and it looked like sensible thing to add, so there it is 🙂