Thanks. This is great feedback. We've written a blog post[0] about some of strategies developers are using to write relationships, but we haven't covered explicitly the failure scenarios.
For the scenario that you've described, you should be able to retry persisting the zedtoken, but if there's some fundamental reason that's not working, you can always perform a fully consistency check and persist the resulting value -- fresher zedtokens are always safe.
[0]: https://authzed.com/blog/writing-relationships-to-spicedb/
