fix: harden group lifecycle and registration writes

server/store/store.go

@@ -1716,6 +1716,11 @@ func (groupBusinessMapper) UpdateSettings(tenantID types.TenantID, topic string,
 		} else {
 			_ = DeleteCachedObject(tenantID, cacheNamespaceGroupSettings, strings.TrimSpace(topic))
 		}
+		if patch.MuteAll != nil {
+			invalidateGroupMemberPages(tenantID, topic)
+			invalidateGroupMemberObjects(tenantID, topic)
+			invalidateTopicSubscriptions(tenantID, topic)
+		}
 	}
 	return settings, err
 }
@@ -1735,6 +1740,9 @@ func (groupBusinessMapper) Dissolve(tenantID types.TenantID, topic string, actor
 		} else {
 			_ = DeleteCachedObject(tenantID, cacheNamespaceGroupSettings, strings.TrimSpace(topic))
 		}
+		invalidateGroupMemberPages(tenantID, topic)
+		invalidateGroupMemberObjects(tenantID, topic)
+		invalidateTopicSubscriptions(tenantID, topic)
 	}
 	return settings, err
 }
@@ -1825,6 +1833,31 @@ func invalidateGroupMemberPages(tenantID types.TenantID, topic string) {
 	}
 }
 
+func invalidateGroupMemberObjects(tenantID types.TenantID, topic string) {
+	topic = strings.TrimSpace(topic)
+	if topic == "" {
+		return
+	}
+	if err := DeleteCachedObjectsByPrefix(tenantID, cacheNamespaceGroupMember, topic+":"); err != nil {
+		logs.Warn.Printf("cache group members[%s]: delete failed: %v", topic, err)
+	}
+}
+
+func invalidateTopicSubscriptions(tenantID types.TenantID, topic string) {
+	topic = strings.TrimSpace(topic)
+	if topic == "" {
+		return
+	}
+	if err := DeleteCachedObjectsByPrefix(tenantID, cacheNamespaceSub, topic+":"); err != nil {
+		logs.Warn.Printf("cache subscriptions[%s]: delete failed: %v", topic, err)
+	}
+	if channel := types.GrpToChn(topic); channel != topic {
+		if err := DeleteCachedObjectsByPrefix(tenantID, cacheNamespaceSub, channel+":"); err != nil {
+			logs.Warn.Printf("cache subscriptions[%s]: delete failed: %v", channel, err)
+		}
+	}
+}
+
 func (groupBusinessMapper) UpdateMember(tenantID types.TenantID, topic string, uid types.Uid, patch types.GroupMemberPatch) (*types.GroupMember, error) {
 	if strings.TrimSpace(topic) == "" || uid.IsZero() {
 		return nil, types.ErrMalformed