Add index to speed up loading projects from DeployToken

db/migrate/20180927073410_add_index_to_project_deploy_tokens_deploy_token_id.rb

+# frozen_string_literal: true
+
+class AddIndexToProjectDeployTokensDeployTokenId < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index :project_deploy_tokens, :deploy_token_id
+  end
+
+  def down
+    remove_concurrent_index(:project_deploy_tokens, :deploy_token_id) if Gitlab::Database.postgresql?
+  end
+end

db/schema.rb

@@ -1588,6 +1588,7 @@ ActiveRecord::Schema.define(version: 20181101144347) do
     t.datetime_with_timezone "created_at", null: false
   end
 
+  add_index "project_deploy_tokens", ["deploy_token_id"], name: "index_project_deploy_tokens_on_deploy_token_id", using: :btree
   add_index "project_deploy_tokens", ["project_id", "deploy_token_id"], name: "index_project_deploy_tokens_on_project_id_and_deploy_token_id", unique: true, using: :btree
 
   create_table "project_features", force: :cascade do |t|