Merged PR 457: Accountレコード削除時に同時に削除されるよう外部キー制約を追加

## 概要
[Task2766: Accountレコード削除時に同時に削除されるよう外部キー制約を追加](https://paruru.nds-tyo.co.jp:8443/tfs/ReciproCollection/fa4924a4-d079-4fab-9fb5-a9a11eb205f0/_workitems/edit/2766)

各テーブルに外部キー制約を追加しました。
アカウント削除時にアカウントテーブルのデータを削除した際、ON DELETE CASCADEにより関連項目をすべて削除する用途になります。

## レビューポイント
設定内容は適切か。
設定箇所に過不足はないか。
マイグレーションの途中で元データの不整合などで失敗した場合、それまでに外部キー制約の追加・削除に成功していた分が巻き戻らなかったのですが、何か巻き戻す方法はあるでしょうか？

## UIの変更
なし

## 動作確認状況
ローカルでmigrate Up/Downの動作を確認

## 補足
なし

dictation_server/db/migrations/042-add-foreign-key-for-account-delete.sql

@@ -0,0 +1,33 @@
+-- +migrate Up
+ALTER TABLE `users` ADD CONSTRAINT `users_fk_account_id` FOREIGN KEY(account_id) REFERENCES accounts(id) ON DELETE CASCADE;
+ALTER TABLE `sort_criteria` ADD CONSTRAINT `sort_criteria_fk_user_id` FOREIGN KEY(user_id) REFERENCES users(id) ON DELETE CASCADE;
+ALTER TABLE `license_orders` ADD CONSTRAINT `license_orders_fk_from_account_id` FOREIGN KEY(from_account_id) REFERENCES accounts(id) ON DELETE CASCADE;
+ALTER TABLE `licenses` ADD CONSTRAINT `licenses_fk_account_id` FOREIGN KEY(account_id) REFERENCES accounts(id) ON DELETE CASCADE;
+ALTER TABLE `card_licenses` ADD CONSTRAINT `card_licenses_fk_license_id` FOREIGN KEY(license_id) REFERENCES licenses(id) ON DELETE CASCADE;
+ALTER TABLE `license_allocation_history` ADD CONSTRAINT `license_allocation_history_fk_account_id` FOREIGN KEY(account_id) REFERENCES accounts(id) ON DELETE CASCADE;
+ALTER TABLE `user_group` ADD CONSTRAINT `user_group_fk_account_id` FOREIGN KEY(account_id) REFERENCES accounts(id) ON DELETE CASCADE;
+ALTER TABLE `user_group_member` ADD CONSTRAINT `user_group_member_fk_user_group_id` FOREIGN KEY(user_group_id) REFERENCES user_group(id) ON DELETE CASCADE;
+ALTER TABLE `audio_files` ADD CONSTRAINT `audio_files_fk_account_id` FOREIGN KEY(account_id) REFERENCES accounts(id) ON DELETE CASCADE;
+ALTER TABLE `audio_option_items` ADD CONSTRAINT `audio_option_items_fk_audio_file_id` FOREIGN KEY(audio_file_id) REFERENCES audio_files(id) ON DELETE CASCADE;
+ALTER TABLE `worktypes` ADD CONSTRAINT `worktypes_fk_account_id` FOREIGN KEY(account_id) REFERENCES accounts(id) ON DELETE CASCADE;
+ALTER TABLE `option_items` ADD CONSTRAINT `option_items_fk_worktype_id` FOREIGN KEY(worktype_id) REFERENCES worktypes(id) ON DELETE CASCADE;
+ALTER TABLE `template_files` ADD CONSTRAINT `template_files_fk_account_id` FOREIGN KEY(account_id) REFERENCES accounts(id) ON DELETE CASCADE;
+ALTER TABLE `tasks` ADD CONSTRAINT `tasks_fk_account_id` FOREIGN KEY(account_id) REFERENCES accounts(id) ON DELETE CASCADE;
+ALTER TABLE `checkout_permission` ADD CONSTRAINT `checkout_permission_fk_task_id` FOREIGN KEY(task_id) REFERENCES tasks(id) ON DELETE CASCADE;
+
+-- +migrate Down
+ALTER TABLE `users` DROP FOREIGN KEY `users_fk_account_id`;
+ALTER TABLE `sort_criteria` DROP FOREIGN KEY `sort_criteria_fk_user_id`;
+ALTER TABLE `license_orders` DROP FOREIGN KEY `license_orders_fk_from_account_id`;
+ALTER TABLE `licenses` DROP FOREIGN KEY `licenses_fk_account_id`;
+ALTER TABLE `card_licenses` DROP FOREIGN KEY `card_licenses_fk_license_id`;
+ALTER TABLE `license_allocation_history` DROP FOREIGN KEY `license_allocation_history_fk_account_id`;
+ALTER TABLE `user_group` DROP FOREIGN KEY `user_group_fk_account_id`;
+ALTER TABLE `user_group_member` DROP FOREIGN KEY `user_group_member_fk_user_group_id`;
+ALTER TABLE `audio_files` DROP FOREIGN KEY `audio_files_fk_account_id`;
+ALTER TABLE `audio_option_items` DROP FOREIGN KEY `audio_option_items_fk_audio_file_id`;
+ALTER TABLE `worktypes` DROP FOREIGN KEY `worktypes_fk_account_id`;
+ALTER TABLE `option_items` DROP FOREIGN KEY `option_items_fk_worktype_id`;
+ALTER TABLE `template_files` DROP FOREIGN KEY `template_files_fk_account_id`;
+ALTER TABLE `tasks` DROP FOREIGN KEY `tasks_fk_account_id`;
+ALTER TABLE `checkout_permission` DROP FOREIGN KEY `checkout_permission_fk_task_id`;