No need for remember_token indexes.

.gitignore

@@ -5,4 +5,4 @@ coverage/*
 *.sqlite3
 rdoc/*
 devise.gemspec
-pkg/
+pkg

README.rdoc

@@ -56,7 +56,6 @@ You may also want to add some indexes to improve performance:
   add_index :your_table, :email
   add_index :your_table, :confirmation_token    # for confirmable
   add_index :your_table, :reset_password_token  # for recoverable
-  add_index :your_table, :remember_token        # for rememberable
 
 Now let's setup a User model adding the devise line to have your authentication working:
 

lib/devise/migrations.rb

@@ -12,7 +12,6 @@ module Devise
   # However this method does not add indexes. If you need them, here is the declaration:
   #
   #   add_index "accounts", ["email"],                :name => "email",                :unique => true
-  #   add_index "accounts", ["remember_token"],       :name => "remember_token",       :unique => true
   #   add_index "accounts", ["confirmation_token"],   :name => "confirmation_token",   :unique => true
   #   add_index "accounts", ["reset_password_token"], :name => "reset_password_token", :unique => true
   #