Hello,
Just a suggestion, it’s may be better to permit to delete key for free (or a very small price), because I suppose most of users don’t delete unused keys to not waste money… (the cost per GB isn’t really the problem… except if all your keys take 10MB of course)
For the good of your KV, your servers, and the planet, it’s may be better to permit to developer to clean the KV for free, or at a very small cost, what do you think ?