Remove user authentication_token column

app/models/user.rb

@@ -21,6 +21,7 @@ class User < ActiveRecord::Base
 
   ignore_column :external_email
   ignore_column :email_provider
+  ignore_column :authentication_token
 
   add_authentication_token_field :incoming_email_token
   add_authentication_token_field :rss_token

db/post_migrate/20171012150314_remove_user_authentication_token.rb

+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class RemoveUserAuthenticationToken < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    remove_column :users, :authentication_token
+  end
+
+  def down
+    add_column :users, :authentication_token, :string
+
+    add_concurrent_index :users, :authentication_token, unique: true
+  end
+end

db/schema.rb

@@ -1670,7 +1670,6 @@ ActiveRecord::Schema.define(version: 20171017145932) do
     t.string "skype", default: "", null: false
     t.string "linkedin", default: "", null: false
     t.string "twitter", default: "", null: false
-    t.string "authentication_token"
     t.string "bio"
     t.integer "failed_attempts", default: 0
     t.datetime "locked_at"
@@ -1720,7 +1719,6 @@ ActiveRecord::Schema.define(version: 20171017145932) do
   end
 
   add_index "users", ["admin"], name: "index_users_on_admin", using: :btree
-  add_index "users", ["authentication_token"], name: "index_users_on_authentication_token", unique: true, using: :btree
   add_index "users", ["confirmation_token"], name: "index_users_on_confirmation_token", unique: true, using: :btree
   add_index "users", ["created_at"], name: "index_users_on_created_at", using: :btree
   add_index "users", ["email"], name: "index_users_on_email", unique: true, using: :btree