eliminate monthly janitor trial messages

app/logical/monthly_maintenance.rb

@@ -1,6 +1,5 @@
 class MonthlyMaintenance
   def run
     ActiveRecord::Base.connection.execute("set statement_timeout = 0")
-    JanitorTrial.message_candidates!
   end
 end

app/models/janitor_trial.rb

@@ -22,36 +22,6 @@ class JanitorTrial < ApplicationRecord
     q.apply_default_order(params)
   end
 
-  def self.message_candidates!
-    admin = User.admins.first
-    n = 0
-
-    User.without_timeout do
-      User.where("last_logged_in_at >= ? and created_at <= ? and email is not null and (favorite_count >= 300 OR post_upload_count >= 300) and bit_prefs & ? = 0", 1.week.ago, 6.months.ago, User.flag_value_for("can_approve_posts")).find_each do |user|
-        if !Dmail.where("from_id = ? and to_id = ? and title = ?", admin.id, user.id, "Test Janitor Invitation").exists?
-          favorites = user.favorites.order("random()").limit(400).map(&:post_id)
-          uploads = user.posts.order("random()").limit(400).map(&:id)
-          p50 = ActiveRecord::Base.select_value_sql("select percentile_cont(0.50) within group (order by score) from posts where id in (?)", favorites + uploads).to_f
-          
-          if p50 > 3
-            n += 1
-            if n > 8
-              break
-            end
-
-            CurrentUser.scoped(admin, "127.0.0.1") do
-              body = <<-EOS
-                Janitors on #{Danbooru.config.app_name} are responsible for helping maintain a high level of quality on the site. They approve uploads from other users and help with other moderation efforts. You would be expected at a minimum to approve a few posts a week. If you are interested, please respond to this message.
-              EOS
-
-              Dmail.create_split(:title => "Test Janitor Invitation", :body => body, :to_id => user.id)
-            end
-          end
-        end
-      end
-    end
-  end
-
   def initialize_status
     self.status = "active"
   end