diff --git a/viz/app/pending.js b/viz/app/pending.js
index e69de29..73c2540 100644
--- a/viz/app/pending.js
+++ b/viz/app/pending.js
@@ -0,0 +1,138 @@
+// viz/app/pending.js
+const LS_KEY = "stviz:v1:pendingSkuEdits";
+
+function safeParseJson(s) {
+  try {
+    return JSON.parse(String(s || ""));
+  } catch {
+    return null;
+  }
+}
+
+export function loadPendingEdits() {
+  const raw = (() => {
+    try {
+      return localStorage.getItem(LS_KEY) || "";
+    } catch {
+      return "";
+    }
+  })();
+
+  const j = safeParseJson(raw);
+  const links = Array.isArray(j?.links) ? j.links : [];
+  const ignores = Array.isArray(j?.ignores) ? j.ignores : [];
+
+  return {
+    links: links
+      .map((x) => ({
+        fromSku: String(x?.fromSku || "").trim(),
+        toSku: String(x?.toSku || "").trim(),
+      }))
+      .filter((x) => x.fromSku && x.toSku && x.fromSku !== x.toSku),
+    ignores: ignores
+      .map((x) => ({
+        skuA: String(x?.skuA || x?.a || "").trim(),
+        skuB: String(x?.skuB || x?.b || "").trim(),
+      }))
+      .filter((x) => x.skuA && x.skuB && x.skuA !== x.skuB),
+    createdAt: String(j?.createdAt || ""),
+  };
+}
+
+export function savePendingEdits(edits) {
+  const out = {
+    createdAt: edits?.createdAt || new Date().toISOString(),
+    links: Array.isArray(edits?.links) ? edits.links : [],
+    ignores: Array.isArray(edits?.ignores) ? edits.ignores : [],
+  };
+  try {
+    localStorage.setItem(LS_KEY, JSON.stringify(out));
+  } catch {}
+  return out;
+}
+
+export function clearPendingEdits() {
+  try {
+    localStorage.removeItem(LS_KEY);
+  } catch {}
+}
+
+function canonicalPairKey(a, b) {
+  const x = String(a || "").trim();
+  const y = String(b || "").trim();
+  if (!x || !y) return "";
+  return x < y ? `${x}|${y}` : `${y}|${x}`;
+}
+
+export function addPendingLink(fromSku, toSku) {
+  const f = String(fromSku || "").trim();
+  const t = String(toSku || "").trim();
+  if (!f || !t || f === t) return false;
+
+  const edits = loadPendingEdits();
+  const k = `${f}→${t}`;
+  const seen = new Set(edits.links.map((x) => `${x.fromSku}→${x.toSku}`));
+  if (seen.has(k)) return false;
+
+  edits.links.push({ fromSku: f, toSku: t });
+  savePendingEdits(edits);
+  return true;
+}
+
+export function addPendingIgnore(skuA, skuB) {
+  const a = String(skuA || "").trim();
+  const b = String(skuB || "").trim();
+  if (!a || !b || a === b) return false;
+
+  const edits = loadPendingEdits();
+  const k = canonicalPairKey(a, b);
+  const seen = new Set(edits.ignores.map((x) => canonicalPairKey(x.skuA, x.skuB)));
+  if (seen.has(k)) return false;
+
+  edits.ignores.push({ skuA: a, skuB: b });
+  savePendingEdits(edits);
+  return true;
+}
+
+export function pendingCounts() {
+  const e = loadPendingEdits();
+  return { links: e.links.length, ignores: e.ignores.length, total: e.links.length + e.ignores.length };
+}
+
+export function applyPendingToMeta(meta) {
+  const base = {
+    generatedAt: String(meta?.generatedAt || ""),
+    links: Array.isArray(meta?.links) ? meta.links.slice() : [],
+    ignores: Array.isArray(meta?.ignores) ? meta.ignores.slice() : [],
+  };
+
+  const p = loadPendingEdits();
+
+  // merge links (dedupe by from→to)
+  const seenL = new Set(
+    base.links.map((x) => `${String(x?.fromSku || "").trim()}→${String(x?.toSku || "").trim()}`)
+  );
+  for (const x of p.links) {
+    const k = `${x.fromSku}→${x.toSku}`;
+    if (!seenL.has(k)) {
+      seenL.add(k);
+      base.links.push({ fromSku: x.fromSku, toSku: x.toSku });
+    }
+  }
+
+  // merge ignores (dedupe by canonical pair key)
+  const seenI = new Set(
+    base.ignores.map((x) =>
+      canonicalPairKey(String(x?.skuA || x?.a || "").trim(), String(x?.skuB || x?.b || "").trim())
+    )
+  );
+  for (const x of p.ignores) {
+    const k = canonicalPairKey(x.skuA, x.skuB);
+    if (!seenI.has(k)) {
+      seenI.add(k);
+      base.ignores.push({ skuA: x.skuA, skuB: x.skuB });
+    }
+  }
+
+  return base;
+}