Changes to Re-make a Seedance 2.5 480p generation at 1080p: the same video, not an upscale, for 7 days after it was made. Spends credits, exactly what a 1080p run of the same input would have cost. A generation that can still be re-made carries `finalize_1080p` (credits, expires_at); otherwise 409 not_finalizable. No body.