Transactional Outbox Pattern

The Transactional Outbox Pattern is a way to reliably send messages or data updates between systems. When a change occurs in a primary database, the system records a message about that change in a special "outbox" table within the same database, ensuring the change and message are saved together atomically. A separate process then reads these messages from the outbox and delivers them to other systems or services. This approach guarantees that messages are not lost and happen exactly when the change occurs, maintaining consistency and reliability in distributed applications.