Break the hourly/daily/weekly/monthly maintenance tasks down into
individual delayed jobs. This way if one task fails, it won't prevent
other tasks from running. Also, jobs can be run in parallel, and can be
individually retried if they fail.
* Move the Curated pool updater from Reportbooru to Danbooru.
* Change the process for selecting curated posts. Previously it was
every post from the last week with at least three supervotes. This was
flawed because it included both super-upvotes and super-downvotes. Now
it's the top 100 posts from the last week, ordered from most super-upvoted
to least.
Drop support for https://danbooru.donmai.us/cache/tags.json. This was a
nightly dump of the tags table that was originally added in #1012. It
was never documented and never really used except for by the DanbooruUp
extension.
