diff --git a/config/routes.rb b/config/routes.rb
index 56f618c..8db2b20 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -1,6 +1,9 @@
 Rails.application.routes.draw do
   if ENV['worker_num']=='0' && File.basename($0) != 'rake' && !Rails.const_defined?('Console')
     Bulletin
+    if BulletinFeedCache.count>BulletinFeed.count*5
+      BulletinFeedCache.collection.drop
+    end
     Thread.new do
       BulletinFeedCache.regenerate_all
     end