# Sigma Computing: Major incident: Scheduled Backend Tasks not running on AWS US

**Summary:** Sigma Computing reported a major AWS US outage affecting scheduled exports, materializations, and warehouse view updates from 2026-01-05 21:38 UTC to 2026-01-05 23:33 UTC, lasting 1 h 55 min. A fix was implemented, and Sigma stated that queued tasks should start recovering automatically after resolution. _(machine-written, sol)_
- Kind: Major incident · Label: outage (model (Jev))
- Changed: 2026-01-05 21:38 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/99psnr7j6763](https://stspg.io/99psnr7j6763)
- [Company: Sigma Computing](https://rewindex.com/company/sigma-computing.md)
- Versions: before (none: first archived) → after incident\_version:77/ys5j4xh9xxhs@d1a91918dd25
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ Scheduled Backend Tasks not running on AWS US
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2026-01-05 21:38 UTC
```

**5. Added: Resolved time**

```diff
+ 2026-01-05 23:33 UTC
```

**6. Added: Affected components**

```diff
+ AWS - Sigma - AWS (US), Sigma - AWS (US)
```

**7. Added: Update** (investigating) · 2026-01-05 21:38 UTC

```diff
+ We are currently investigating an issue affecting scheduled exports, materializations, and warehouse view updates on AWS US
```

**8. Added: Update** (monitoring) · 2026-01-05 23:13 UTC

```diff
+ A fix has been implemented and we are monitoring the results
```

**9. Added: Update** (resolved) · 2026-01-05 23:33 UTC

```diff
+ This incident has been resolved. The queued tasks should start recovering automatically
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2026-01-05 21:38 UTC | Major incident: Scheduled Backend Tasks not running on AWS US (this change) | outage |

All Sigma Computing changes: [timeline](https://rewindex.com/company/sigma-computing/changes.md)
_Diff excerpts are shown on normalized text: dates, counters and tokens appear as ‹date›, ‹count›, ‹tok›; noise-only edits are hidden. Rewindex shows the changed passages, not a copy of the page._


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Canonical: https://rewindex.com/change/if989190d842c56 · Markdown: https://rewindex.com/change/if989190d842c56.md · JSON: https://rewindex.com/api/v1/changes/if989190d842c56 · Generated 2026-10-18T03:33:53.992Z