Make SCUM logs live relay only

platform/api/log_events_handlers.go

@@ -24,13 +24,17 @@ func (h *coreHandlers) serverLogEvents(w http.ResponseWriter, r *http.Request) {
 		writeMethodNotAllowed(w, http.MethodGet)
 		return
 	}
-	liveBoundary := time.Now().UTC().Add(-liveLogSourceClockSkew)
 	instance, streams, liveEligible, subscription, err := h.openLogEventSubscription(r)
 	if err != nil {
 		writeServiceError(w, err)
 		return
 	}
 	defer subscription.Close()
+	h.streamCurrentLogEvents(w, r, instance, streams, liveEligible, subscription)
+}
+
+func (h *coreHandlers) streamCurrentLogEvents(w http.ResponseWriter, r *http.Request, instance domain.ServerInstance, streams []domain.LogStream, liveEligible bool, subscription service.LogEventSubscription) {
+	liveBoundary := time.Now().UTC().Add(-liveLogSourceClockSkew)
 	flusher, ok := w.(http.Flusher)
 	if !ok {
 		writeServiceError(w, fmt.Errorf("streaming response unsupported"))
@@ -131,7 +135,7 @@ func (h *coreHandlers) serverLogEvents(w http.ResponseWriter, r *http.Request) {
 			if !active.contains(event.Stream) {
 				continue
 			}
-			if !sourceLogEntryIsLive(event.Entry, liveBoundary) {
+			if !subscriptionEvent.Live && !sourceLogEntryIsLive(event.Entry, liveBoundary) {
 				if event.Entry.Seq > emittedThrough[event.Stream.ID] {
 					emittedThrough[event.Stream.ID] = event.Entry.Seq
 				}
@@ -143,7 +147,10 @@ func (h *coreHandlers) serverLogEvents(w http.ResponseWriter, r *http.Request) {
 					return
 				}
 			}
-			if event.Entry.Seq <= emittedThrough[event.Stream.ID] {
+			// Live relay traffic is already a current best-effort observation.
+			// Do not sequence-gate it: a restarted Run intentionally starts with
+			// fresh in-memory sequence state and must still reach this subscriber.
+			if !subscriptionEvent.Live && event.Entry.Seq <= emittedThrough[event.Stream.ID] {
 				continue
 			}
 			if err := writeSSEJSON(w, "log", logEventID(event), dto.LogStreamEventFromDomain(event)); err != nil {
@@ -228,7 +235,9 @@ func (h *coreHandlers) writeCurrentLogSession(w http.ResponseWriter, serverInsta
 		return nil, err
 	}
 	for _, stream := range active.streams {
-		emittedThrough[stream.ID] = stream.LatestSeq
+		// Stream metadata identifies the current channel only. The platform
+		// never replays its old body when a live subscriber connects.
+		emittedThrough[stream.ID] = 0
 		if err := writeSSEJSON(w, "stream", "", dto.LogStreamFromDomain(stream)); err != nil {
 			return nil, err
 		}