feat: persist authenticated queue probe RTT

server/api/service.go

@@ -26,6 +26,9 @@ const maxBodyBytes = 8 << 10
 type CandidateProvider func(playerID, ticketID string) (domain.Candidate, error)
 type CandidateProviderV2 func(playerID, ticketID string, spec domain.QueueSpec) (domain.Candidate, error)
 type ProbeProvider func(playerID, region string, opaqueLocation, nonce []byte, receivedAt time.Time) (domain.ProbeEvidence, []byte, error)
+type ProbeRecorder interface {
+	RecordProbe(context.Context, string, string, time.Duration, time.Time) error
+}
 
 type QueueBackend interface {
 	Create(context.Context, string, string, string, domain.QueueSpec, time.Time) (domain.QueueTicket, error)
@@ -86,6 +89,7 @@ type Service struct {
 	QueueBackend    QueueBackend
 	CandidateIndex  CandidateIndex
 	Probe           ProbeProvider
+	ProbeRecorder   ProbeRecorder
 	Assignment      AssignmentProvider
 	Now             func() time.Time
 	Proposals       map[string]*domain.Proposal
@@ -653,6 +657,12 @@ func (s *Service) probe(w http.ResponseWriter, r *http.Request) {
 		writeError(w, http.StatusUnprocessableEntity, "invalid_probe")
 		return
 	}
+	if s.ProbeRecorder != nil {
+		if err := s.ProbeRecorder.RecordProbe(r.Context(), playerID, region, evidence.ServerRTT, receivedAt); err != nil {
+			writeError(w, http.StatusServiceUnavailable, "probe_persistence_failed")
+			return
+		}
+	}
 	writeJSON(w, http.StatusAccepted, map[string]any{"region": region, "server_rtt_ms": evidence.ServerRTT.Milliseconds(), "status": "accepted"})
 }