> For the complete documentation index, see [llms.txt](https://docs.tryterra.co/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.tryterra.co/faq/help-topics/webhook/delivery-timing-volume-and-ordering/backfill-volume-spikes.md).

# Why did my webhook volume suddenly spike?

Large webhook bursts are **expected recovery traffic**, not invalid requests. They typically follow an interruption: when delivery to your endpoint is down, Terra keeps retrying, and the data accumulated for that period is sent in bulk once your service resumes. This can recur after any future interruption.

**Put a queue or buffer in front of your webhook consumer** so bursts do not overload your database writes.

{% hint style="info" %}
If a `user_id` looks malformed in the dashboard, that is a display-only issue. The actual payload always carries the real identifier, and `user_id` is documented as an arbitrary string, not strictly a UUID.
{% endhint %}