Does writing the schema cause any locking in spiceDB? Does performance of writing relationships and checking permissions possibly decrease when a new schema is being written? If so, are there any short-circuits for this if the new schema happens to be the same as the existing one? I want to know if I can write the schema on every deployment of our app, regardless of whether there are changes or not. But I won't want the performance of checks to degrade during the schema deployment.