Requests rejected before handleChatCore — a pipeline-gate rejection
(provider circuit breaker OPEN / model cooldown) or a combo whose
targets were all exhausted — short-circuited in chat.ts and only wrote
a call_logs row (dashboard/logs). They never reached persistFailureUsage,
so no usage_history row was created and the per-api-key usage counter
(getApiKeyUsageRows reads usage_history) never incremented. An API key
whose traffic was entirely gate/breaker-rejected showed zero requests
despite real usage.
Route both rejection paths through recordRejectedRequestUsage(), which
writes the call_logs row (unchanged visibility) AND a usage_history row
attributed to the api key with success:false, mirroring persistFailureUsage.
Regression guard: tests/unit/rejected-request-usage.test.ts.
