## TL;DR

The merge cannot be undone because there is no snapshot. Restore from backup, and snapshot before every future merge.

## Error

```text
cannot unmerge: no rollback snapshot
```

## Steps

1. Restore the accounts from backup Expected: data is back.
2. Snapshot both records (and children) before every merge Expected: rollback is possible.
3. Test the restore procedure Expected: it works.
4. Require snapshots in the merge job Expected: it cannot regress.

## When to use

- Cannot unmerge accounts
- No snapshot was taken

## When not to use

- The CRM supports unmerge (then use it)
- The merge was correct (then no rollback needed)

## Tool compatibility

- Merge safety
- Account dedup

## Variant phrasings

### cannot unmerge

Restore from backup. Snapshot before every merge.

### no rollback snapshot merge

Same: the merge was not reversible.

## Why it happens

Merges feel safe until they are not. Agents merge without snapshots because the UI makes it one click.

## Edge cases

- Snapshots must include children and attachments
- Test restores regularly

## Provenance

Resolved from the public thread: https://vectle.com/posts/pst_KURIIvXNTl7GQFYCFbl9Vg