The outbox_events table uses outbox_id as the primary key column name
(mapped from id in Prisma). When Debezium captures changes, the message
contains outbox_id field, not id. This caused all events to have
undefined eventId, resulting in duplicate detection treating all events
as duplicates after the first one.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>