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

app/logical/upload_error_checker.rb

@@ -0,0 +1,20 @@
+#!/usr/bin/env ruby
+
+require 'mail'
+
+class UploadErrorChecker
+  def check!
+    count = Upload.where("status like 'error%' and created_at >= ?", 1.hour.ago).count
+    if count > 5
+      mail = Mail.new do
+        from "webmaster@danbooru.donmai.us"
+        to "r888888888@gmail.com"
+        subject "[danbooru] Upload error count at #{count}"
+        body "nt"
+      end
+      mail.delivery_method :sendmail
+      mail.deliver
+    end
+  end
+end
+