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Cancelling an empty chat task deletes the user message, and attachment.chat_message_id is ON DELETE CASCADE (migration 083), so the detach-before-delete in finalizeCancelledChatMessage is the only thing keeping the user's attachment from being silently destroyed. Nothing covered it. Add a DB regression test that binds an attachment to the cancelled user message and asserts: the row survives the cascade (chat_message_id NULL, chat_session_id retained), the cancel response returns it via cancelled_chat_message.attachments, and a resend re-binds it to the new message. Verified red when the detach step is removed. Related issue: MUL-3364 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Co-authored-by: multica-agent <github@multica.ai>