# Delayed Real-time Events and Apparent Data Loss when Re-enabling Event Streams Webhook **URL:** \ **Category:** Get Help\ **Tags:** other, test\ **Created:** [May 8, 2026, 1:39pm UTC](https://community.auth0.com/t/delayed-real-time-events-and-apparent-data-loss-when-re-enabling-event-streams-webhook/199742 "2026-05-08T13:39:36Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![tu.nguyent](https://sea1.discourse-cdn.com/auth0/user_avatar/community.auth0.com/tu.nguyent/32/79316_2.png) [@tu.nguyent](https://community.auth0.com/u/tu.nguyent)\ **Post date:** [May 8, 2026, 1:39pm UTC](https://community.auth0.com/t/delayed-real-time-events-and-apparent-data-loss-when-re-enabling-event-streams-webhook/199742/1 "2026-05-08T13:39:36Z")
Hi, I am observing a strange behavior with Auth0 Event Streams and I need to understand the internal mechanism: 1. **Backlog Storm:** Whenever I enable my Webhook, it immediately starts sending a large volume of events for various users. These seem to be old events that occurred while the stream was disabled. Is there an internal buffer that flushes upon enablement? 2. **Delayed Real-time Events:** When I perform a “User Update” on my test user immediately after enabling the stream, the event does not appear. I have to wait for a long time (maybe 1-2 hours) for the “old” events to finish processing before I start seeing my test user’s real-time events. 3. **Missing Events:** If I perform a `User Update` within the first 1-2 minutes of enablement, these specific events do not appear to be delivered at all. **My questions:** - Does Auth0 Event Streams buffer events while a stream is disabled or failing? If yes, for how long? - Is there a way to “clear” the backlog before enabling a stream so I can focus on real-time testing? - Why is there a significant delay before new events are processed after a period of inactivity? Many thanks ---
**Author:** ![nik.baleca](https://sea1.discourse-cdn.com/auth0/user_avatar/community.auth0.com/nik.baleca/32/68749_2.png) [@nik.baleca](https://community.auth0.com/u/nik.baleca)\ **Post date:** [May 8, 2026, 5:32pm UTC](https://community.auth0.com/t/delayed-real-time-events-and-apparent-data-loss-when-re-enabling-event-streams-webhook/199742/3 "2026-05-08T17:32:00Z")
Hi @tu.nguyent Welcome to the Auth0 community! Auth0 utilizes an internal buffer and cursor system for Event Streams, which is responsible for the backlog storm and the subsequent delay in real-time events. However, Auth0 **does not** buffer new events while a stream is paused or disabled; it only buffers events that previously failed to deliver prior to the pause. To clear this backlog and immediately focus on real-time testing, you cannot simply flush the queue—you must **delete the existing Event Stream and create a brand new one**. Because Auth0 does not expose a “Purge Queue” or “Skip to Present” button for Event Streams, the only way to bypass the backlog is to abandon the old cursor entirely. To reset your testing environment: 1. **Delete** the currently disabled Event Stream in the Auth0 Dashboard. 2. **Create** a brand new Custom Webhook Event Stream pointing to your URL. Creating a new stream generates a fresh internal cursor starting at the exact moment of creation. The old retry backlog is permanently bypassed and discarded, and any `User Update` actions you perform immediately afterward will be delivered in near real-time without the backlog storm. If you have any other questions, let me know! Kind Regards, Nik ---
**Author:** ![system](https://global.discourse-cdn.com/auth0/original/3X/b/5/b560f266932fcce5d57f09a6595bd50518cae3f3.jpeg) [@system](https://community.auth0.com/u/system)\ **Post date:** [May 22, 2026, 5:32pm UTC](https://community.auth0.com/t/delayed-real-time-events-and-apparent-data-loss-when-re-enabling-event-streams-webhook/199742/4 "2026-05-22T17:32:19Z")
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