Add index for old_username and old_old_usernames (#4593)

db/migrate/20191025185619_add_old_username_index_to_users.rb

@@ -0,0 +1,8 @@
+class AddOldUsernameIndexToUsers < ActiveRecord::Migration[5.2]
+  disable_ddl_transaction!
+
+  def change
+    add_index :users, :old_username, algorithm: :concurrently
+    add_index :users, :old_old_username, algorithm: :concurrently
+  end
+end

db/schema.rb

@@ -12,8 +12,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2019_10_16_135034) do
-
+ActiveRecord::Schema.define(version: 2019_10_25_185619) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
 
@@ -1178,6 +1177,8 @@ ActiveRecord::Schema.define(version: 2019_10_16_135034) do
     t.index ["email"], name: "index_users_on_email", unique: true
     t.index ["github_username"], name: "index_users_on_github_username", unique: true
     t.index ["language_settings"], name: "index_users_on_language_settings", using: :gin
+    t.index ["old_old_username"], name: "index_users_on_old_old_username"
+    t.index ["old_username"], name: "index_users_on_old_username"
     t.index ["organization_id"], name: "index_users_on_organization_id"
     t.index ["reset_password_token"], name: "index_users_on_reset_password_token", unique: true
     t.index ["twitter_username"], name: "index_users_on_twitter_username", unique: true