does spiceDB support transaction operation?

WriteRelationships

API allows you to transactionally create, touch and delete one or more relationships, if that's what you mean. If you mean exposing transactions and rollbacks via the API, no it's not supported

thanks, dear vroldanbet. I mean the second.

this may be somewhat related https://github.com/authzed/spicedb/issues/1407 Would you mind describing your use-case?