Every customer handler that names an instance resolves it through
ownedInstance, which returns 404 rather than 403 for another account's
instance -- a 403 confirms the instance exists, which is an existence
oracle over customer data.
The unique index on admin_instances.instance_id, not the pre-check, is what
actually prevents two accounts owning one instance. Relink issues a
replacement covering the REMAINING term, so it cannot be used to extend a
subscription, and the old licence is not revoked because offline
verification has no revocation -- its instance binding is what stops it.
The route table lands with the staff handlers in the next commit so every
commit builds.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
mrhid6andClaude Opus 5
c829cc41d9