History: Concepts

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1. 15 Oct 2026 · +3 −1 lines
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     Event types: `run.running`, `run.completed`, `run.failed`, `run.nsfw`, `run.canceled`. Output links are kept 72 h.
     
   + Your product can also opt in to congestion events, `queue.congestion_started` and `queue.congestion_ended`: see [Queue and congestion](queue-and-congestion.md#events).
   + 
     ## Limits {#limits}
     
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     |---|---|---|
     | Runs per end user per day | 20 | Over it: 429 `end_user_cap_reached` with `Retry-After` (resets 00:00 UTC). Your org can change its cap. |
   - | Runs at once per product | 20 | More runs wait in line (queued) instead of failing; Priority goes first. |
   + | Runs at once per product | 20 | More runs wait in line (queued); Priority goes first. As many priority runs can wait as you have slots; past that, a new priority run gets 429 `product_busy` with `Retry-After`. Submit answers show the numbers: see [Queue and congestion](queue-and-congestion.md). |
     | Active Relax runs per end user | 1 | The next Relax run of that end user starts when the last one ends. |
     | Webhook signature window | 300 s | Reject a webhook whose timestamp is older or newer than this. |
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2. 14 Oct 2026 · Page created