Aaron Kimbrell 2277cbd7e2 fix(ugc): stopping the UGC server cancels the models being made ...

Stopping waited for every worker to finish its model, and with the path
traced hidden-face removal a big model takes minutes, so a restart hung.
UgcThrottle::Cancel(true) (set by UgcProcessor::Stop) makes Checkpoint,
which the long loops already call, throw UgcThrottle::Cancelled; the worker
abandons the job without writing or recording anything, so its row stays
waiting and is made again after the restart. The throttle's sleeps wake to
check it. Previews answer 503.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

2026-09-28 22:31:25 -05:00

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