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Problems

1. What to do with users that are queued, and then it turns out they do not exist on MAL?
   Do quick ajax request?

Solved problems

1. Dequeuing users: When you visit any user page regardless whether it's cached or not, ready to be served or not - add the user to queue. Back end should pick up users from queue and immediately remove them before processing.
2. Back end control flow:
   1. Pick up queued users,
   2. Download their stuff and put it into DB (UserProcessor),
   3. Download missing or old anime/manga stuff and put it into DB (AnimeProcessor, MangaProcessor),
   4. Render content for all users that were just downloaded (*Controller),
   5. Render global data (GlobalDataPresenter).
3. Front end control flow:
   1. Queue users into back end,
   2. If cache exists:
      1. Send the cache
   3. Otherwise:
      1. If user exists in local DB:
         1. render and save cache, then send the cache,
      2. Otherwise:
         1. Display friendly message that user does not exists and he was put in the processing queue.
4. Back end operating mode - for now, let's assume it should pick up maximally n users every run and use control flow described above.
5. User settings regarding image colors - when tweaking settings, bypass proxy, else read cached image
6. Cache generation - pages shouldn't be generated in cron