1. once-rearm on edit: editing any field of a finished one-time job reset
completedOnce, silently resurrecting it. Now only a SCHEDULE edit
(scheduleType/runAt/interval/daily/weekly) re-arms a completed once job;
cosmetic edits (rename/notes) leave completedOnce intact.
2. update-validation gap: CronJobUpdateSchema = .partial() drops the cross-field
superRefine, so a PUT switching scheduleType without its dependent field
produced a dead enabled job (nextRunAt:null). updateJob now re-validates the
MERGED job against the full CronJobSchema and throws 400 on inconsistency,
leaving the stored job untouched.
3. concurrency-skip silent starvation: skip_if_same_agent_running advanced the
schedule but wrote no run record, so a perpetually-skipped job had empty
history. Now records a 'skipped' run (new CronJobRunStatus) + lastStatus.
Tests updated/added in cron-service.test.ts (37 pass): once non-schedule edit
preserves completedOnce, schedule edit re-arms, inconsistent partial update is
rejected with the stored job untouched, and the skip path records a skipped run.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PmvZR12aX2v8K7YhqxPUAU
