Add a way for users to upvote/downvote timestamp revisions
A new table should be created, with a foreign key to a timestamp revision.
A user should be able to upvote/downvote timestamp revision just to help validate that revision are correct. This could be used to determine whether users are submitting invalid timestamps.
I'm unsure whether users need to be signed in in order to vote for submissions. If not, then we can probably add a custom viewset GET action to record votes, rate limit submitting votes, and somehow "uniquely" identify anonymous users to avoid duplicate votes.