diff --git a/apps/web/app/api/moments/route.ts b/apps/web/app/api/moments/route.ts
new file mode 100644
index 0000000..cb0f65d
--- /dev/null
+++ b/apps/web/app/api/moments/route.ts
@@ -0,0 +1,66 @@
+import { z } from "zod";
+
+import { getDb } from "@tline/db";
+import { clusterMoments } from "../../lib/moments";
+
+export const runtime = "nodejs";
+
+const querySchema = z
+  .object({
+    start: z.string().datetime().optional(),
+    end: z.string().datetime().optional(),
+    limit: z.coerce.number().int().positive().max(2000).default(1000),
+  })
+  .strict();
+
+export async function GET(request: Request): Promise<Response> {
+  const url = new URL(request.url);
+  const parsed = querySchema.safeParse({
+    start: url.searchParams.get("start") ?? undefined,
+    end: url.searchParams.get("end") ?? undefined,
+    limit: url.searchParams.get("limit") ?? undefined,
+  });
+
+  if (!parsed.success) {
+    return Response.json(
+      { error: "invalid_query", issues: parsed.error.issues },
+      { status: 400 },
+    );
+  }
+
+  const query = parsed.data;
+  const start = query.start ? new Date(query.start) : null;
+  const end = query.end ? new Date(query.end) : null;
+
+  const db = getDb();
+  const rows = await db<
+    {
+      id: string;
+      capture_ts_utc: string | null;
+    }[]
+  >`
+    select id, capture_ts_utc
+    from assets
+    where capture_ts_utc is not null
+      and (${start}::timestamptz is null or capture_ts_utc >= ${start}::timestamptz)
+      and (${end}::timestamptz is null or capture_ts_utc < ${end}::timestamptz)
+      and status <> 'failed'
+    order by capture_ts_utc asc, id asc
+    limit ${query.limit}
+  `;
+
+  const clusters = clusterMoments(
+    rows
+      .filter((row) => Boolean(row.capture_ts_utc))
+      .map((row) => ({
+        id: row.id,
+        capture_ts_utc: row.capture_ts_utc as string,
+      })),
+  );
+
+  return Response.json({
+    start: start ? start.toISOString() : null,
+    end: end ? end.toISOString() : null,
+    clusters,
+  });
+}
diff --git a/apps/web/app/components/TimelineTree.tsx b/apps/web/app/components/TimelineTree.tsx
index 5f594cd..8310628 100644
--- a/apps/web/app/components/TimelineTree.tsx
+++ b/apps/web/app/components/TimelineTree.tsx
@@ -27,6 +27,17 @@ type ApiTreeResponse = {
   nodes: ApiTreeRow[];
 };
 
+type MomentCluster = {
+  day: string;
+  count: number;
+};
+
+type MomentsResponse = {
+  start: string | null;
+  end: string | null;
+  clusters: MomentCluster[];
+};
+
 type Orientation = "vertical" | "horizontal";
 
 type ExpandedState = Record<string, boolean>;
@@ -147,6 +158,9 @@ export function TimelineTree(props: {
   const [expanded, setExpanded] = useState<ExpandedState>({});
   const [rows, setRows] = useState<ApiTreeRow[] | null>(null);
   const [error, setError] = useState<string | null>(null);
+  const [showMoments, setShowMoments] = useState(false);
+  const [moments, setMoments] = useState<MomentsResponse | null>(null);
+  const [momentsError, setMomentsError] = useState<string | null>(null);
 
   // simple pan/zoom via viewBox
   const svgRef = useRef<SVGSVGElement | null>(null);
@@ -182,6 +196,34 @@ export function TimelineTree(props: {
     };
   }, []);
 
+  useEffect(() => {
+    if (!showMoments || !rows) return;
+    let cancelled = false;
+    async function loadMoments() {
+      try {
+        setMomentsError(null);
+        if (!rows || rows.length === 0) return;
+        const start = rows[0]?.group_ts ?? null;
+        const end = rows[rows.length - 1]?.group_ts ?? null;
+        const params = new URLSearchParams();
+        if (start) params.set("start", start);
+        if (end) params.set("end", end);
+        const res = await fetch(`/api/moments?${params.toString()}`, {
+          cache: "no-store",
+        });
+        if (!res.ok) throw new Error(`moments_fetch_failed:${res.status}`);
+        const json = (await res.json()) as MomentsResponse;
+        if (!cancelled) setMoments(json);
+      } catch (e) {
+        if (!cancelled) setMomentsError(e instanceof Error ? e.message : String(e));
+      }
+    }
+    void loadMoments();
+    return () => {
+      cancelled = true;
+    };
+  }, [showMoments, rows]);
+
   const roots = useMemo(() => (rows ? buildHierarchy(rows) : []), [rows]);
   const visible = useMemo(
     () => gatherVisible(roots, expanded),
@@ -315,12 +357,18 @@ export function TimelineTree(props: {
         >
           Reset view
         </button>
+        <button type="button" onClick={() => setShowMoments((v) => !v)}>
+          {showMoments ? "Hide moments" : "Show moments"}
+        </button>
         {rows ? (
           <span style={{ color: "#666" }}>{rows.length} day nodes</span>
         ) : null}
       </div>
 
       {error ? <div style={{ color: "#b00" }}>Error: {error}</div> : null}
+      {momentsError ? (
+        <div style={{ color: "#b00" }}>Moments error: {momentsError}</div>
+      ) : null}
       {!rows && !error ? (
         <div
           style={{
@@ -390,6 +438,15 @@ export function TimelineTree(props: {
               const isDay = node.id.startsWith("d:");
               const clickCursor = hasChildren || isDay ? "pointer" : "default";
 
+              const dayKey = node.label;
+              const dayMoments = showMoments
+                ? moments?.clusters.filter((c) => c.day === dayKey) ?? []
+                : [];
+              const momentsCount = dayMoments.reduce(
+                (sum, c) => sum + c.count,
+                0,
+              );
+
               return (
                 <g
                   key={node.id}
@@ -404,6 +461,7 @@ export function TimelineTree(props: {
                   <text x={20} y={5} fontSize={14} fill="#111">
                     {node.label} ({node.countReady}/{node.countTotal})
                     {hasChildren ? (isExpanded ? " ▼" : " ▶") : ""}
+                    {showMoments && isDay ? ` · ${momentsCount} moment assets` : ""}
                   </text>
                 </g>
               );
diff --git a/apps/web/app/lib/moments.ts b/apps/web/app/lib/moments.ts
new file mode 100644
index 0000000..755d6ef
--- /dev/null
+++ b/apps/web/app/lib/moments.ts
@@ -0,0 +1,84 @@
+export type MomentAsset = {
+  id: string;
+  capture_ts_utc: string;
+};
+
+export type MomentCluster = {
+  day: string;
+  start: string;
+  end: string;
+  count: number;
+  assets: MomentAsset[];
+};
+
+const MOMENT_WINDOW_MINUTES = 30;
+const MOMENT_WINDOW_MS = MOMENT_WINDOW_MINUTES * 60 * 1000;
+
+function dayKeyFromIso(iso: string) {
+  const d = new Date(iso);
+  const yyyy = d.getUTCFullYear();
+  const mm = String(d.getUTCMonth() + 1).padStart(2, "0");
+  const dd = String(d.getUTCDate()).padStart(2, "0");
+  return `${yyyy}-${mm}-${dd}`;
+}
+
+export function clusterMoments(input: MomentAsset[]): MomentCluster[] {
+  const byDay = new Map<string, MomentAsset[]>();
+
+  for (const asset of input) {
+    if (!asset.capture_ts_utc) continue;
+    const key = dayKeyFromIso(asset.capture_ts_utc);
+    const list = byDay.get(key);
+    if (list) list.push(asset);
+    else byDay.set(key, [asset]);
+  }
+
+  const clusters: MomentCluster[] = [];
+
+  for (const [day, assets] of byDay) {
+    const sorted = [...assets].sort((a, b) =>
+      a.capture_ts_utc.localeCompare(b.capture_ts_utc),
+    );
+
+    let current: MomentAsset[] = [];
+    let lastTs: number | null = null;
+
+    for (const asset of sorted) {
+      const ts = new Date(asset.capture_ts_utc).getTime();
+      if (!Number.isFinite(ts)) continue;
+
+      if (lastTs === null || ts - lastTs <= MOMENT_WINDOW_MS) {
+        current.push(asset);
+      } else {
+        const start = current[0]?.capture_ts_utc;
+        const end = current[current.length - 1]?.capture_ts_utc;
+        if (start && end) {
+          clusters.push({
+            day,
+            start,
+            end,
+            count: current.length,
+            assets: current,
+          });
+        }
+        current = [asset];
+      }
+
+      lastTs = ts;
+    }
+
+    if (current.length) {
+      const start = current[0].capture_ts_utc;
+      const end = current[current.length - 1].capture_ts_utc;
+      clusters.push({
+        day,
+        start,
+        end,
+        count: current.length,
+        assets: current,
+      });
+    }
+  }
+
+  return clusters;
+}
diff --git a/apps/web/src/__tests__/moments.test.ts b/apps/web/src/__tests__/moments.test.ts
new file mode 100644
index 0000000..c9c1e63
--- /dev/null
+++ b/apps/web/src/__tests__/moments.test.ts
@@ -0,0 +1,47 @@
+import { test, expect } from "bun:test";
+
+import { clusterMoments } from "../../app/lib/moments";
+
+test("clusterMoments groups assets within 30 minutes", () => {
+  const clusters = clusterMoments([
+    { id: "a", capture_ts_utc: "2026-02-01T10:00:00.000Z" },
+    { id: "b", capture_ts_utc: "2026-02-01T10:20:00.000Z" },
+    { id: "c", capture_ts_utc: "2026-02-01T10:49:00.000Z" },
+  ]);
+
+  expect(clusters).toHaveLength(1);
+  expect(clusters[0]?.count).toBe(3);
+});
+
+test("clusterMoments splits after window gap", () => {
+  const clusters = clusterMoments([
+    { id: "a", capture_ts_utc: "2026-02-01T10:00:00.000Z" },
+    { id: "b", capture_ts_utc: "2026-02-01T11:05:00.000Z" },
+  ]);
+
+  expect(clusters).toHaveLength(2);
+  expect(clusters[0]?.count).toBe(1);
+  expect(clusters[1]?.count).toBe(1);
+});
+
+test("clusterMoments sorts inputs per day", () => {
+  const clusters = clusterMoments([
+    { id: "b", capture_ts_utc: "2026-02-01T10:20:00.000Z" },
+    { id: "a", capture_ts_utc: "2026-02-01T10:00:00.000Z" },
+    { id: "c", capture_ts_utc: "2026-02-01T10:40:00.000Z" },
+  ]);
+
+  expect(clusters).toHaveLength(1);
+  expect(clusters[0]?.assets.map((a) => a.id)).toEqual(["a", "b", "c"]);
+});
+
+test("clusterMoments splits by day", () => {
+  const clusters = clusterMoments([
+    { id: "a", capture_ts_utc: "2026-02-01T23:50:00.000Z" },
+    { id: "b", capture_ts_utc: "2026-02-02T00:10:00.000Z" },
+  ]);
+
+  expect(clusters).toHaveLength(2);
+  expect(clusters[0]?.day).toBe("2026-02-01");
+  expect(clusters[1]?.day).toBe("2026-02-02");
+});