feat: URL and img changes

src/tracker/merge.js

@@ -1,3 +1,4 @@
+// src/tracker/merge.js
 "use strict";
 
 const { normalizeCspc } = require("../utils/sku");
@@ -10,6 +11,10 @@ function normImg(v) {
   return s;
 }
 
+function isRealSku(v) {
+  return Boolean(normalizeCspc(v));
+}
+
 function mergeDiscoveredIntoDb(prevDb, discovered) {
   const merged = new Map(prevDb.byUrl);
 
@@ -18,9 +23,40 @@ function mergeDiscoveredIntoDb(prevDb, discovered) {
   const removedItems = [];
   const restoredItems = [];
 
-  for (const [url, nowRaw] of discovered.entries()) {
+  // If a product's URL changes but it has a *real* SKU, treat it as the same product:
-    const prev = prevDb.byUrl.get(url);
+  // update DB entry (and URL key) but do NOT count it as New/Removed.
+  const prevByRealSku = new Map(); // sku6 -> { url, item }
+  for (const [url, it] of prevDb.byUrl.entries()) {
+    if (!it || it.removed) continue;
+    const sku6 = normalizeCspc(it.sku);
+    if (!sku6) continue;
+    // If dup SKUs exist, keep the first one we saw (stable enough).
+    if (!prevByRealSku.has(sku6)) prevByRealSku.set(sku6, { url, item: it });
+  }
 
+  const matchedPrevUrls = new Set(); // old URLs we "found" via SKU even if URL changed
+
+  for (const [url, nowRaw] of discovered.entries()) {
+    let prev = prevDb.byUrl.get(url);
+    let prevUrlForThisItem = url;
+
+    // URL not found in previous DB: try to match by *real* SKU.
+    if (!prev) {
+      const nowSku6 = normalizeCspc(nowRaw.sku);
+      if (nowSku6) {
+        const hit = prevByRealSku.get(nowSku6);
+        if (hit && hit.url && hit.url !== url) {
+          prev = hit.item;
+          prevUrlForThisItem = hit.url;
+          matchedPrevUrls.add(hit.url);
+
+          // Move record key from old URL -> new URL in DB map (no New/Removed noise)
+          if (merged.has(hit.url)) merged.delete(hit.url);
+        }
+      }
+    }
+
+    // Truly new (no URL match, no real-SKU match)
     if (!prev) {
       const now = {
         ...nowRaw,
@@ -33,7 +69,9 @@ function mergeDiscoveredIntoDb(prevDb, discovered) {
       continue;
     }
 
-    if (prev.removed) {
+    // If the previous record was removed and we found it by the SAME URL, keep current behavior (restored).
+    // Note: if it "came back" under a different URL, we only de-dupe New/Removed for URL changes on active items.
+    if (prevUrlForThisItem === url && prev.removed) {
       const now = {
         ...nowRaw,
         sku: normalizeCspc(nowRaw.sku) || normalizeCspc(prev.sku),
@@ -50,6 +88,7 @@ function mergeDiscoveredIntoDb(prevDb, discovered) {
       continue;
     }
 
+    // Update-in-place (or URL-move-with-real-SKU): update DB, report price changes normally.
     const prevPrice = normPrice(prev.price);
     const nowPrice = normPrice(nowRaw.price);
 
@@ -65,7 +104,7 @@ function mergeDiscoveredIntoDb(prevDb, discovered) {
     const skuChanged = prevSku !== nowSku;
     const imgChanged = prevImg !== nowImg;
 
-    if (nameChanged || priceChanged || skuChanged || imgChanged) {
+    if (nameChanged || priceChanged || skuChanged || imgChanged || prevUrlForThisItem !== url) {
       merged.set(url, { ...nowRaw, sku: nowSku, img: nowImg, removed: false });
     }
 
@@ -82,6 +121,7 @@ function mergeDiscoveredIntoDb(prevDb, discovered) {
 
   for (const [url, prev] of prevDb.byUrl.entries()) {
     if (discovered.has(url)) continue;
+    if (matchedPrevUrls.has(url)) continue; // de-dupe URL changes for real-SKU items
     if (!prev.removed) {
       const removed = { ...prev, removed: true };
       merged.set(url, removed);