What are permission spaces? Is that the

<space>/user:<id>

on all resources? Can I use that for partitioning relations in the same database / spicedb instances?

where did you read about permissions spaces?

It's a flag to

zed ... --permissions-system string   permissions system to query

That's a relic of our multi-tenant Authzed serverless, and does not do anything in OSS SpiceDB. You can append prefixes to your schema definitions, but in OSS it's just cosmetic for your own logical separation, in practice it's all in the same namespace

ah, thanks for the explanation