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# Reindex migration
<details>
<summary><strong>🧭 Quick Return to Map</strong></summary>
<br>
> You are in a sub-page of **Chunking**.
> To reorient, go back here:
>
> - [**Chunking** — text segmentation and context window management](./README.md)
> - [**WFGY Global Fix Map** — main Emergency Room, 300+ structured fixes](../README.md)
> - [**WFGY Problem Map 1.0** — 16 reproducible failure modes](../../README.md)
>
> Think of this page as a desk within a ward.
> If you need the full triage and all prescriptions, return to the Emergency Room lobby.
</details>
A safe, auditable procedure to rebuild chunks and embeddings after edits while keeping references stable. This page shows how to preserve ids, remap offsets, and roll out without breaking citations or downstream apps.
## Open these first