Sync fails: "'DFWD5YN1' is not a valid collection key" after deleting collection

Macdull
Hi,

I'm having a persistent sync issue in Zotero 10.0.1 on macOS 14.6 (ARM64).

The sync error is:

Error 400 for collection DFWD5YN1 in My Library:
ZoteroObjectUploadError: 'DFWD5YN1' is not a valid collection key

'DFWD5YN1' is not a valid collection key
Made no progress during upload -- stopping

I previously identified this key as belonging to a collection named:

ASD_孤岛能力_AI职业_系统综述

I moved the items to a new collection, deleted the original collection, and emptied the Trash, but the same key is still blocking sync.

Important context:
- My last successful sync was about 88 days ago.
- My local library contains many items added during those 88 days that are NOT present in the web library.
- Therefore I cannot simply reset the local database from the server.
- I have already made a complete backup of my Zotero data directory, including zotero.sqlite and storage.
- I upgraded from Zotero 9.0.6 to Zotero 10.0.1.
- After upgrading, Check Database Integrity reports no errors.
- Sync still fails specifically on DFWD5YN1.

Could you please advise how to safely remove or repair the residual invalid collection key without losing the unsynced local data?

Thank you.
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