Notify Workflow Run Event

Notify an event to a specific workflow run's waiters.

This endpoint sends an event notification to waiters within a specific workflow run. Unlike the general notify endpoint, this uses a "safe notify" mechanism that guarantees delivery even if no waiter is currently active.

Safe Notify Behavior:

• If a waiter is currently active, it receives the notification immediately
• If no waiter is active, the notification is saved in the database
• When a waiter becomes active later, it will consume the saved notification
• This ensures events are never lost due to timing issues