CHW-5308 TuningSuggestionStoreFailure

tuning suggestion store request failed; retry shortly or check the operator dashboard

Default message: tuning suggestion store request failed; retry shortly or check the operator dashboard
HTTP status: 500 (server)

Problem. A tuning-suggestion read or transition failed at the DB layer. Cause. Transient backend failure or a schema migration in flight; surfaced as 500 so operators can monitor the rate. Fix. Retry shortly; if persistent, check the operator dashboard for backend health. HTTP 500.