SpiceDB v0.15 introduces stricter validation for undefined caveats in relationship tuples
The goal is to decide how to handle existing relationship tuples that reference caveats not defined in the schema after upgrading to SpiceDB v0.15, where such tuples are now rejected at write time. Operators must avoid runtime CheckPermission errors caused by the new INVALID_ARGUMENT response, while also considering the effort required to clean up or migrate
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