不要なカラムを削除

$ rails g migration RemoveUnwantedColumnsFromUsers reset_password_token:string reset_password_sent_at:datetime remember_created_at:datetime
/Users/yuta/tmp/rails/Twitter/config/initializers/devise.rb:255: warning: already initialized constant OpenSSL::SSL::VERIFY_PEER
      invoke  active_record
      create    db/migrate/20131015121550_remove_unwanted_columns_from_users.rb
$ rake db:migrate:reset
==  CreateTweets: migrating ===================================================
-- create_table(:tweets)
   -> 0.0021s
==  CreateTweets: migrated (0.0022s) ==========================================

==  DeviseCreateUsers: migrating ==============================================
-- create_table(:users)
   -> 0.0043s
-- add_index(:users, :email, {:unique=>true})
   -> 0.0010s
-- add_index(:users, :reset_password_token, {:unique=>true})
   -> 0.0007s
==  DeviseCreateUsers: migrated (0.0062s) =====================================

==  AddUserIdToTweet: migrating ===============================================
-- add_column(:tweets, :user_id, :integer)
   -> 0.0009s
==  AddUserIdToTweet: migrated (0.0010s) ======================================

==  AddColumnsToUsers: migrating ==============================================
-- add_column(:users, :provider, :string)
   -> 0.0009s
-- add_column(:users, :uid, :string)
   -> 0.0005s
-- add_column(:users, :name, :string)
   -> 0.0005s
==  AddColumnsToUsers: migrated (0.0022s) =====================================

==  CreateFriendships: migrating ==============================================
-- create_table(:friendships)
   -> 0.0015s
==  CreateFriendships: migrated (0.0016s) =====================================

==  RemoveUnwantedColumnsFromUsers: migrating =================================
-- remove_column(:users, :reset_password_token, :string)
   -> 0.0132s
-- remove_column(:users, :reset_password_sent_at, :datetime)
   -> 0.0082s
-- remove_column(:users, :remember_created_at, :datetime)
   -> 0.0069s
==  RemoveUnwantedColumnsFromUsers: migrated (0.0285s) ========================