Local attachments have no `created_at` value assigned

[ChristophWurst]

Expected behavior

Attachments added to new messages are stored in mail_attachments. At \OCA\Mail\Service\Attachment\AttachmentService::addFile we don't assign a value to createdAt, thus the timestamp is of default 0.

Actual behavior

The timestamp is set to a real value. We need this to clean up old data.

Mail app

Mail app version: v1.11

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Implementation detail

• Inject \OCP\AppFramework\Utility\ITimeFactory into \OCA\Mail\Service\Attachment\AttachmentService::__construct
• Assign the time factory to a new private class property
• Use the time factor and getTime() to fetch the current time stamp
• Assign the time stamp value to the attachment via LocalAttachment::setCreatedAt
• Bonus: write a migration that drops the default value of the mail_attachments.created_at column and make it NOT NULL. That enforces that a value has to be specified for an insert and would have prevented this bug.

[miaulalala]

Question for my understanding only: why do we not work with constraints like ON CREATE and ON UPDATE?

[ChristophWurst]

Triggers are not possible at the moment: nextcloud/server#31130