remove mpixel search, remove some unused indexes on posts

db/migrate/20150116013315_remove_unused_indexes.rb

@@ -0,0 +1,8 @@
+class RemoveUnusedIndexes < ActiveRecord::Migration
+  def change
+    execute "set statement_timeout = 0"
+    remove_index :posts, :mpixels
+    remove_index :posts, :source
+    remove_index :posts, :uploader_ip_addr
+  end
+end