# Census: Major incident: Some syncs failing with "Missing corresponding dataset file for prefix: record_deletes.0"

**Summary:** Census reported a major Sync Engine incident starting 2025-02-05 22:38 UTC: some syncs failed with "Missing corresponding dataset file for prefix: record\_deletes.0" after a code change introduced a bug. A revert deployed at 22:56 UTC; the incident was resolved at 2025-02-05 23:30 UTC after over 30 minutes without errors, with a computed duration of 51 min. _(machine-written, sol)_
- Kind: Major incident · Label: outage (model (Jev))
- Changed: 2025-02-05 22:38 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/gwj8z6vj45kb](https://stspg.io/gwj8z6vj45kb)
- [Company: Census](https://rewindex.com/company/census.md)
- Versions: before (none: first archived) → after incident\_version:136/3wf0x7vjyngr@66ee9110e474
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ Some syncs failing with "Missing corresponding dataset file for prefix: record_deletes.0"
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2025-02-05 22:38 UTC
```

**5. Added: Resolved time**

```diff
+ 2025-02-05 23:30 UTC
```

**6. Added: Affected components**

```diff
+ Sync Engine
```

**7. Added: Update** (identified) · 2025-02-05 22:38 UTC

```diff
+ A recent code change introduced a bug resulting in some syncs failing with the message "Missing corresponding dataset file for prefix: record_deletes.0". We have identified the problematic change, and a revert is in progress.
```

**8. Added: Update** (monitoring) · 2025-02-05 22:56 UTC

```diff
+ The revert has deployed.  We are monitoring to ensure that the errors subside.
```

**9. Added: Update** (resolved) · 2025-02-05 23:30 UTC

```diff
+ No errors have been seen for over 30 minutes.  We are declaring the incident resolved.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2025-02-05 22:38 UTC | Major incident: Some syncs failing with "Missing corresponding dataset file for prefix: record\_deletes.0" (this change) | outage |

All Census changes: [timeline](https://rewindex.com/company/census/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/i5121878e493f7f · Markdown: https://rewindex.com/change/i5121878e493f7f.md · JSON: https://rewindex.com/api/v1/changes/i5121878e493f7f · Generated 2026-10-18T02:55:37.945Z