add hourly check for upload queue issues, restore old note coloring

config/monit.conf

@@ -0,0 +1,4 @@
+set alert r888888888@gmail.com
+
+check process delayed_job with pidfile /var/www/danbooru2/shared/pids/delayed_job.pid
+  alert r888888888@gmail.com only on {nonexist}

config/schedule.rb

@@ -4,6 +4,10 @@ every 4.hours do
   runner "TagSubscription.process_all"
 end
 
+every 1.hour do
+  runner "UploadErrorChecker.new.check!"
+end
+
 every 1.day do
   runner "PostPruner.new.prune!"
 end