Build a per-target dedup_key (tenant/workspace/article/platform/account) on
publish job creation, take an xact advisory lock on the keys, look up
already-active publish_records via the payload index, and skip creating
duplicate desktop_tasks. Surface created vs existing task ids on
CreatePublishJobResponse (and shared-types) so callers can tell the
difference, return `desktop_publish_duplicate` on unique-constraint races,
and expose desktop_account_id on PublishRecordResponse so the modal can
disable already-published accounts. Make the compliance ack consumer
accept a nullable job id since the dedup short-circuit no longer creates
one.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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