update

pkg/proxy/remotehost.go

@@ -263,10 +263,16 @@ func (h *RemoteHost[V]) GetActorIds() []uint64 {
 	return reply.GetIds()
 }
 
-func (h *RemoteHost[V]) AnnounceOwnership(ownerHost string, uids []uint64) {
+func (h *RemoteHost[V]) AnnounceOwnership(ownerHost string, uids []uint64, lastChanges []int64) {
+	// lastChanges is parallel to uids and carries each grain's
+	// UnixNano lastChange stamp at the moment of broadcast. Receivers
+	// use it for first-spawn-wins arbitration on concurrent cold
+	// cache first touch; -1 entries signal "no local grain to back
+	// this id" and trigger the legacy "always accept remote" fallback.
 	_, err := h.controlClient.AnnounceOwnership(context.Background(), &messages.OwnershipAnnounce{
-		Host: ownerHost,
-		Ids:  uids,
+		Host:        ownerHost,
+		Ids:         uids,
+		LastChanges: lastChanges,
 	})
 	if err != nil {
 		log.Printf("ownership announce to %s failed: %v", h.host, err)
@@ -276,10 +282,14 @@ func (h *RemoteHost[V]) AnnounceOwnership(ownerHost string, uids []uint64) {
 	h.missedPings = 0
 }
 
-func (h *RemoteHost[V]) AnnounceExpiry(uids []uint64) {
+func (h *RemoteHost[V]) AnnounceExpiry(uids []uint64, lastChanges []int64) {
+	// lastChanges is a parallel UnixNano stamp slice; informational on
+	// this path (expiry is unilateral from the broadcaster), kept on
+	// the wire for symmetry with AnnounceOwnership.
 	_, err := h.controlClient.AnnounceExpiry(context.Background(), &messages.ExpiryAnnounce{
-		Host: h.host,
-		Ids:  uids,
+		Host:        h.host,
+		Ids:         uids,
+		LastChanges: lastChanges,
 	})
 	if err != nil {
 		log.Printf("expiry announce to %s failed: %v", h.host, err)