Function mergeIdentityTwins

mergeIdentityTwins(tx: IDBTransaction): void
Applies planTwinMerge inside the version-change transaction. Never throws and never aborts: a rejected upgrade leaves the whole database unopenable, which is far worse than a twin drawn twice — a failed read or write is logged, its error event cancelled (uncancelled, it aborts the transaction), and the upgrade goes on with the twins it could not merge.
Parameters
- tx: IDBTransaction
  The upgrade's version-change transaction.
Returns void
Example
```
const request = indexedDB.open("geoleaf-db", 7);
request.onupgradeneeded = (e) => {
    if (e.oldVersion >= 4 && request.transaction) mergeIdentityTwins(request.transaction);
};
```
- Defined in packages/core/src/capabilities/offline/db/identity-twins.ts:116