Add IP addr indexes on comments & artist/artcomm/wikipage versions.

db/migrate/20170112021922_add_ip_addr_indexes_to_tables.rb

@@ -0,0 +1,9 @@
+class AddIpAddrIndexesToTables < ActiveRecord::Migration
+  def change
+    reversible { execute "set statement_timeout = 0" }
+    add_index :wiki_page_versions, :updater_ip_addr
+    add_index :artist_commentary_versions, :updater_ip_addr
+    add_index :artist_versions, :updater_ip_addr
+    add_index :comments, :ip_addr
+  end
+end