Only fetch events when review group is open

web/src/components/timeline/DetailStream.tsx

@@ -25,7 +25,7 @@ import { Tooltip, TooltipContent, TooltipTrigger } from "../ui/tooltip";
 import { Link } from "react-router-dom";
 import { Switch } from "@/components/ui/switch";
 import { useUserPersistence } from "@/hooks/use-user-persistence";
-import { isDesktop } from "react-device-detect";
+import { isDesktop, isOpera } from "react-device-detect";
 import { resolveZoneName } from "@/hooks/use-zone-friendly-name";
 import { PiSlidersHorizontalBold } from "react-icons/pi";
 import { MdAutoAwesome } from "react-icons/md";
@@ -67,37 +67,6 @@ export default function DetailStream({
     onSeek(timestamp, isPlaying);
   };
 
-  // Collect all unique event IDs from all review items
-  const allEventIds = useMemo(() => {
-    if (!reviewItems || reviewItems.length === 0) return [];
-    const idsSet = new Set<string>();
-    reviewItems.forEach((review) => {
-      if (review?.data?.detections?.length > 0) {
-        review.data.detections.forEach((id) => idsSet.add(id));
-      }
-    });
-    return Array.from(idsSet);
-  }, [reviewItems]);
-
-  // Fetch all events in a single API call
-  const { data: allFetchedEvents, isValidating: isValidatingEvents } = useSWR<
-    Event[]
-  >(
-    allEventIds.length > 0
-      ? ["event_ids", { ids: allEventIds.join(",") }]
-      : null,
-  );
-
-  // Create a Map for quick event lookup by ID
-  const eventsById = useMemo(() => {
-    if (!allFetchedEvents) return new Map<string, Event>();
-    const map = new Map<string, Event>();
-    allFetchedEvents.forEach((event) => {
-      map.set(event.id, event);
-    });
-    return map;
-  }, [allFetchedEvents]);
-
   // Ensure we initialize the active review when reviewItems first arrive.
   // This helps when the component mounts while the video is already
   // playing — it guarantees the matching review is highlighted right
@@ -247,8 +216,6 @@ export default function DetailStream({
                     onActivate={() => setActiveReviewId(id)}
                     onOpenUpload={(e) => setUpload(e)}
                     alwaysExpandActive={alwaysExpandActive}
-                    eventsById={eventsById}
-                    isValidatingEvents={isValidatingEvents}
                   />
                 );
               })
@@ -312,8 +279,6 @@ type ReviewGroupProps = {
   effectiveTime?: number;
   annotationOffset: number;
   alwaysExpandActive?: boolean;
-  eventsById: Map<string, Event>;
-  isValidatingEvents: boolean;
 };
 
 function ReviewGroup({
@@ -327,8 +292,6 @@ function ReviewGroup({
   effectiveTime,
   annotationOffset,
   alwaysExpandActive = false,
-  eventsById,
-  isValidatingEvents,
 }: ReviewGroupProps) {
   const { t } = useTranslation("views/events");
   const [open, setOpen] = useState(false);
@@ -353,14 +316,13 @@ function ReviewGroup({
     date_style: "medium",
   });
 
-  const shouldFetchEvents = review?.data?.detections?.length > 0;
+  const shouldFetchEvents = open && review?.data?.detections?.length > 0;
 
-  const fetchedEvents = useMemo(() => {
+  const { data: fetchedEvents, isValidating } = useSWR<Event[]>(
-    if (!shouldFetchEvents || !review?.data?.detections) return undefined;
+    shouldFetchEvents
-    return review.data.detections
+      ? ["event_ids", { ids: review.data.detections.join(",") }]
-      .map((eventId) => eventsById.get(eventId))
+      : null,
-      .filter((event): event is Event => event !== undefined);
+  );
-  }, [shouldFetchEvents, review?.data?.detections, eventsById]);
 
   const rawIconLabels: string[] = [
     ...(fetchedEvents
@@ -483,7 +445,7 @@ function ReviewGroup({
 
       {open && (
         <div className="space-y-0.5">
-          {shouldFetchEvents && isValidatingEvents && !fetchedEvents ? (
+          {shouldFetchEvents && isValidating && !fetchedEvents ? (
             <ActivityIndicator />
           ) : (
             (fetchedEvents || []).map((event, index) => {