Retrospective opt-out

Currently, there is a way to opt out of Plausible analytics by setting the plausible_ignore flag in localStorage: https://plausible.io/docs/excluding-localstorage

However, if this option is behind a toggle, it means that there is usually some event (or events) still logged for each user that opts out in this way. It would be nice if there was a “opt-out” endpoint which also deletes the entries for a particular user and particular day. Since it’s not possible to delete entries after the salt had been rotated, it would be nice to give the user at least the option to delete entries for the current salt.