CHW-5607 RepoStorageUnavailable

repository storage backend is not wired up; cache operations cannot proceed

Default message: repository storage backend is not wired up; cache operations cannot proceed
HTTP status: 500 (server)

Problem. A cache operation reached a repository whose storage backend is not wired up. Cause. The repository was constructed without a storage instance — typically a misconfigured local dev or a proxy that pre-dates the storage migration. Fix. Re-create the repository so the storage instance is attached, or restart the server after fixing the storage configuration. HTTP 500.