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- _cron_generate: per-rule savepoint isolation (one bad rule can't abort the whole daily batch) - fclk_attach_recurrence: clear an existing recurrence first (no orphaned rule generating forever) - fclk_apply_planner_cell: collapse split rows (search was limit=1 after the UNIQUE drop, orphaning extras) - fclk_release_shift: reject non-posted/open shifts (raw-POST guard) - delete_open_shift: report success=false when nothing was deleted + JS surfaces it - _generate: log before removing an empty recurrence Tests added for collapse, re-attach, draft-release. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>