What is Transaction Log Tailing, and how does it relate to the Transactional Outbox pattern?

Transaction Log Tailing is a specific implementation strategy for the Outbox pattern: instead of a separate poller reading an outbox table (Polling Publisher), a Change-Data-Capture tool (like Debezium) directly tails the database's own transaction/replication log to detect new committed rows and publish them as events. It achieves the same reliable dual-write guarantee as polling but with much lower latency and no added load from repeated polling queries.