Census change history: Partial Sync Outage

Census reported a major Sync Engine outage starting 2024-09-11 19:00 UTC, lasting 5 h 5 min and resolved at 2024-09-12 00:06 UTC. Empty unload batches could fail with file or Parquet conversion errors; after a fix, some syncs encountered function errors, primarily advanced sync engine mirror syncs with no deletes.