diff --git a/backend/docs/feature-list.md b/backend/docs/feature-list.md
index cb39048..9994502 100644
--- a/backend/docs/feature-list.md
+++ b/backend/docs/feature-list.md
@@ -71,7 +71,8 @@ workflow and have no task numbers; see `git log` for real dates/history.
 
 - **6.1** Built standalone annotation page `manual-label-scan/page.tsx` for ground truth editing. Includes image browser, editable fields (`no_sku`, `nama_item`, `expiry_date`, `notes`), and a "Scan with AI" fill-blanks feature — shipped 2026-07-08.
 - **6.2** API + storage groundwork for scan annotation. Extended `api/manual-label-scan` with `GET` list mode and `DELETE`. Persisted uploaded scan photos as base64 images into `sources/product-test-images/`. Made the `scan-pfm` quick-save honest by allowing manual correction before save — shipped 2026-07-08.
-- **6.3** Built `backend/pfm-web-app/scripts/accuracy-check-scan.mts` mirroring the DO-harness architecture, measuring overall match rate plus per-field breakdown (`no_sku`, `expiry_date`) against the new stable labels — shipped 2026-07-08.
+- **6.3** Built `backend/scripts/accuracy-check-scan.mts` mirroring the DO-harness architecture, measuring overall match rate plus per-field breakdown (`no_sku`, `expiry_date`) against the new stable labels — shipped 2026-07-08.
+- **6.4** Ported the DO-harness's auto-diff-vs-previous-run reporting into `accuracy-check-scan.mts`: every run now prints a Δ column per field per split (Training/Validation) vs the last `product_accuracy_history.jsonl` entry, and calls out field- and image-level regressions/improvements explicitly. Added classifier method (`dinov2_similarity`/`yolo_classifier`) distribution and average confidence as informational (non-scoring) context. Created the previously-missing `sources/product-test-images/README.md` documenting the validation-photo drop workflow — shipped 2026-07-13, user-directed `n` request to make algorithm tuning self-verifying.
 
 ### Master Data Management
 - **8.1 & 8.3 CRUD APIs and Web UI**: Created `/api/v1/master/stores` and `/api/v1/master/skus` endpoints alongside a Next.js Admin page (`/admin/master-data`) to visually manage the core reference data used by the OCR matching engine — shipped 2026-07-08.
diff --git a/backend/docs/scan-product.md b/backend/docs/scan-product.md
index 25b052f..ca157b9 100644
--- a/backend/docs/scan-product.md
+++ b/backend/docs/scan-product.md
@@ -136,6 +136,32 @@ get mangled. Verify in `docker logs`: "DINOv2 index loaded with N reference
 images", "Using classifier weights: <new dated file>". Full worked example:
 `plans/next-enhancements.md` task 2.1.
 
+## Accuracy regression harness
+
+`backend/scripts/accuracy-check-scan.mts` — mirrors the DO-flow's
+`pfm-web-app/scripts/accuracy-check.mts`. Hits the live `/api/scan-pfm` for
+every labeled image in `sources/product_manual_labels.json`, checks 3 fields
+(`no_sku`, `nama_item`, `expiry_date`) against ground truth, and splits into:
+- **Training Set** — gallery photos under `foto-kemasan-v2/` (the classifier's
+  own reference images; scores here measure memorization, not generalization).
+- **Validation Set** — flat filenames dropped into
+  `sources/product-test-images/` (a real held-out set; see that folder's
+  `README.md` for the drop-photo → label → re-run workflow via
+  `/manual-label-scan`).
+
+Every run appends to `sources/product_accuracy_history.jsonl` and **auto-diffs
+against the previous run**: the printed summary shows a Δ column per field per
+split, flags field/image-level regressions and improvements, and reports
+classifier method (`dinov2_similarity`/`yolo_classifier`) distribution +
+average confidence as informational context (not scored pass/fail, since
+DINOv2's "confidence" is a raw cosine similarity, not a calibrated
+probability — see Stage 1 above). This is what makes it safe to tune
+`classify_ocr_server.py` and immediately see whether a change helped or hurt.
+
+```bash
+node scripts/accuracy-check-scan.mts   # from backend/
+```
+
 ## Operational notes
 
 - **Env vars**: `CLASSIFIER_SERVER_URL`, `PIPELINE_URL` (gateway, set in compose);
@@ -156,20 +182,18 @@ images", "Using classifier weights: <new dated file>". Full worked example:
 ## Known gaps & future recommendations
 
 Tracked ones (see `plans/next-enhancements.md`):
-- **§6.1–6.3 ground truth**: today's "Save Ground Truth" stores the model's own
-  predictions (only the SKU is editable) and uploads get phantom
-  `uploaded-<timestamp>.jpg` keys with no image persisted; §6 plans the editable
-  annotation page, persisted uploads, and a scan accuracy harness.
 - **Dataset thinness**: 2–16 photos/class caps both classifiers; every new real
-  photo (especially non-studio, in-warehouse shots) matters. The §6.3 harness
-  should report gallery vs. uploaded-photo accuracy separately — gallery photos
-  are training data, so scores on them measure memorization.
+  photo (especially non-studio, in-warehouse shots) matters. The harness above
+  already reports gallery (training) vs. held-out (validation) accuracy
+  separately — but as of this writing `sources/product-test-images/` is empty,
+  so the Validation Set is still 0 images and every published number so far is
+  a training/memorization score. Dropping real photos there is the next step,
+  not yet done.
 
 Additional recommendations (not yet tasks — promote via `e`/`n` when wanted):
-1. **Use `extracted_sku` in match ranking.** An exact 8-digit SKU hit read off
-   the label is far stronger evidence than fuzzy name similarity, yet ranking
-   currently ignores it. Suggested: exact `no_sku` match pins rank 1; blend name
-   similarity for the rest.
+1. ~~Use `extracted_sku` in match ranking.~~ **Done** — `product-scan.ts`'s
+   `classifyAndMatchProduct` already pins rank 1 to an exact `no_sku` match
+   (score forced to 1.0) before falling back to name similarity.
 2. **Fuse DINOv2 and YOLO instead of primary/fallback** (e.g. agreement boosts
    confidence; disagreement flags for review) — cheap, both already load.
 3. **"Not a known product" handling**: DINOv2 always returns *some* class; add a
diff --git a/backend/scripts/accuracy-check-scan.mts b/backend/scripts/accuracy-check-scan.mts
index 789f0e5..3d2d472 100644
--- a/backend/scripts/accuracy-check-scan.mts
+++ b/backend/scripts/accuracy-check-scan.mts
@@ -1,3 +1,20 @@
+// Product-scan (scan-pfm) accuracy regression tool.
+//
+// Hits the live /api/scan-pfm endpoint for every labeled image in
+// backend/sources/product_manual_labels.json, checks 3 fields (no_sku,
+// nama_item, expiry_date) against ground truth, splits results into a
+// Training Set (gallery photos under foto-kemasan-v2/ that trained the
+// classifier itself) vs a Validation Set (flat filenames dropped in
+// backend/sources/product-test-images/), and appends a summary to
+// backend/sources/product_accuracy_history.jsonl. Every run auto-diffs
+// against the last history entry and flags field/image regressions or
+// improvements, so a tuning change to classify_ocr_server.py shows its
+// effect immediately instead of requiring manual before/after comparison.
+//
+// Usage:
+//   node scripts/accuracy-check-scan.mts
+//   node scripts/accuracy-check-scan.mts --base-url http://localhost:3000
+
 import fs from "node:fs";
 import path from "node:path";
 import { fileURLToPath } from "node:url";
@@ -8,10 +25,15 @@ const __dirname = path.dirname(__filename);
 
 const APP_ROOT = path.join(__dirname, "..", "pfm-web-app");
 const SOURCES_DIR = path.join(__dirname, "..", "sources");
-const LABELS_PATH = path.join(SOURCES_DIR, "product_manual_labels.json");
-const HISTORY_PATH = path.join(SOURCES_DIR, "product_accuracy_history.jsonl");
+// Overridable for local smoke-testing against a scratch dataset without
+// touching the real ground-truth/history files.
+const LABELS_PATH = process.env.ACCURACY_LABELS_PATH || path.join(SOURCES_DIR, "product_manual_labels.json");
+const HISTORY_PATH = process.env.ACCURACY_HISTORY_PATH || path.join(SOURCES_DIR, "product_accuracy_history.jsonl");
 
 const FETCH_TIMEOUT_MS = 120_000;
+const FIELDS = ["no_sku", "nama_item", "expiry_date"] as const;
+type Field = typeof FIELDS[number];
+type Split = "training" | "validation";
 
 interface GroundTruth {
   filename: string;
@@ -24,6 +46,7 @@ interface ScanResponse {
   classification?: {
     top1_name: string;
     top1_confidence: number;
+    method?: string;
   };
   ocr?: {
     extracted_expired_date: string;
@@ -36,19 +59,30 @@ interface ScanResponse {
 }
 
 interface Check {
-  field: "no_sku" | "nama_item" | "expiry_date";
+  field: Field;
   match: boolean;
 }
 
+interface ResultItem {
+  gt: GroundTruth;
+  checks: Check[];
+  method?: string;
+  confidence?: number;
+}
+
+interface ClassificationStats {
+  methodCounts: Record<string, number>;
+  avgConfidence: number;
+}
+
 interface HistoryEntry {
   timestamp: string;
   commit: string;
   imageCount: { training: number; validation: number };
   failedImages: string[];
-  fields: {
-    training: Record<string, { correct: number; total: number }>;
-    validation: Record<string, { correct: number; total: number }>;
-  };
+  fields: Record<Split, Record<Field, { correct: number; total: number }>>;
+  classification: Record<Split, ClassificationStats>;
+  perImage: Record<string, number>;
 }
 
 function parseArgs(argv: string[]) {
@@ -107,6 +141,187 @@ function getGitCommit(): string {
 function pct(c: number, t: number) { return t === 0 ? 0 : (c / t) * 100; }
 function fmtPct(n: number) { return `${n.toFixed(1)}%`; }
 
+function fmtDelta(curr: number, prev: number | undefined): string {
+  if (prev === undefined) return "";
+  const d = curr - prev;
+  if (Math.abs(d) < 0.05) return "±0.0";
+  const sign = d > 0 ? "+" : "";
+  return `${sign}${d.toFixed(1)}`;
+}
+
+function loadLastHistoryEntry(): HistoryEntry | null {
+  if (!fs.existsSync(HISTORY_PATH)) return null;
+  const lines = fs.readFileSync(HISTORY_PATH, "utf8").trim().split("\n").filter(Boolean);
+  if (lines.length === 0) return null;
+  try {
+    return JSON.parse(lines[lines.length - 1]);
+  } catch {
+    return null;
+  }
+}
+
+function aggregateFields(list: ResultItem[]): Record<Field, { correct: number; total: number }> {
+  const agg = {
+    no_sku: { correct: 0, total: 0 },
+    nama_item: { correct: 0, total: 0 },
+    expiry_date: { correct: 0, total: 0 }
+  } as Record<Field, { correct: number; total: number }>;
+  for (const item of list) {
+    for (const check of item.checks) {
+      agg[check.field].total++;
+      if (check.match) agg[check.field].correct++;
+    }
+  }
+  return agg;
+}
+
+function overallFromFields(fields: Record<Field, { correct: number; total: number }> | undefined) {
+  if (!fields) return undefined;
+  let correct = 0, total = 0;
+  for (const f of FIELDS) {
+    const s = fields[f];
+    if (s) { correct += s.correct; total += s.total; }
+  }
+  return { correct, total };
+}
+
+function aggregateClassification(list: ResultItem[]): ClassificationStats {
+  const methodCounts: Record<string, number> = {};
+  let confSum = 0;
+  let confCount = 0;
+  for (const item of list) {
+    if (item.method) methodCounts[item.method] = (methodCounts[item.method] || 0) + 1;
+    if (typeof item.confidence === "number") {
+      confSum += item.confidence;
+      confCount++;
+    }
+  }
+  return { methodCounts, avgConfidence: confCount ? confSum / confCount : 0 };
+}
+
+function printClassificationLine(label: string, stats: ClassificationStats, prevStats: ClassificationStats | undefined) {
+  const methodStr = Object.entries(stats.methodCounts).map(([m, c]) => `${m}=${c}`).join(", ") || "n/a";
+  const confStr = stats.avgConfidence ? stats.avgConfidence.toFixed(3) : "n/a";
+  let suffix = "";
+  if (prevStats && prevStats.avgConfidence) {
+    const delta = fmtDelta(stats.avgConfidence, prevStats.avgConfidence);
+    suffix = delta ? ` (Δ ${delta} vs prev)` : "";
+  }
+  console.log(`  ${label.padEnd(11)}: ${methodStr.padEnd(28)} avg confidence ${confStr}${suffix}`);
+}
+
+function printSummary(
+  trainAgg: Record<Field, { correct: number; total: number }>,
+  valAgg: Record<Field, { correct: number; total: number }>,
+  trainClassStats: ClassificationStats,
+  valClassStats: ClassificationStats,
+  perImagePct: Record<string, number>,
+  prev: HistoryEntry | null,
+  imageCount: { training: number; validation: number },
+  failedImages: string[]
+) {
+  console.log("\n=== Product Scan Accuracy Summary ===");
+  console.log(`Training Images: ${imageCount.training} | Validation Images: ${imageCount.validation} | Failed: ${failedImages.length}\n`);
+
+  const fieldCol = 14, numCol = 9, deltaCol = 8;
+  const header =
+    "Field".padEnd(fieldCol) +
+    "Training".padStart(numCol) + "Δ".padStart(deltaCol) + "  " +
+    "Validation".padStart(numCol) + "Δ".padStart(deltaCol);
+  console.log(header);
+  console.log("-".repeat(header.length));
+
+  const overallTrain = { correct: 0, total: 0 };
+  const overallVal = { correct: 0, total: 0 };
+
+  for (const field of FIELDS) {
+    const t = trainAgg[field];
+    const v = valAgg[field];
+    overallTrain.correct += t.correct; overallTrain.total += t.total;
+    overallVal.correct += v.correct; overallVal.total += v.total;
+
+    const tPct = pct(t.correct, t.total);
+    const vPct = pct(v.correct, v.total);
+    const tPrevStat = prev?.fields?.training?.[field];
+    const vPrevStat = prev?.fields?.validation?.[field];
+    const tPrevPct = tPrevStat?.total ? pct(tPrevStat.correct, tPrevStat.total) : undefined;
+    const vPrevPct = vPrevStat?.total ? pct(vPrevStat.correct, vPrevStat.total) : undefined;
+
+    const tStr = t.total ? fmtPct(tPct) : "n/a";
+    const vStr = v.total ? fmtPct(vPct) : "n/a";
+
+    console.log(
+      field.padEnd(fieldCol) +
+      tStr.padStart(numCol) + fmtDelta(tPct, tPrevPct).padStart(deltaCol) + "  " +
+      vStr.padStart(numCol) + fmtDelta(vPct, vPrevPct).padStart(deltaCol)
+    );
+  }
+  console.log("-".repeat(header.length));
+
+  const tOverallPct = pct(overallTrain.correct, overallTrain.total);
+  const vOverallPct = pct(overallVal.correct, overallVal.total);
+  const prevTrainOverall = overallFromFields(prev?.fields?.training);
+  const prevValOverall = overallFromFields(prev?.fields?.validation);
+  const tOverallPrevPct = prevTrainOverall?.total ? pct(prevTrainOverall.correct, prevTrainOverall.total) : undefined;
+  const vOverallPrevPct = prevValOverall?.total ? pct(prevValOverall.correct, prevValOverall.total) : undefined;
+
+  console.log(
+    "OVERALL".padEnd(fieldCol) +
+    fmtPct(tOverallPct).padStart(numCol) + fmtDelta(tOverallPct, tOverallPrevPct).padStart(deltaCol) + "  " +
+    fmtPct(vOverallPct).padStart(numCol) + fmtDelta(vOverallPct, vOverallPrevPct).padStart(deltaCol)
+  );
+
+  if (failedImages.length) {
+    console.log(`\nFailed to parse: ${failedImages.join(", ")}`);
+  }
+
+  // Informational only - DINOv2 "confidence" is a raw cosine similarity, not a
+  // calibrated probability (see docs/scan-product.md), so a delta here doesn't
+  // by itself mean better/worse. Only the fields above drive regression flags.
+  console.log("\nClassification (informational, not scored as pass/fail):");
+  printClassificationLine("Training", trainClassStats, prev?.classification?.training);
+  printClassificationLine("Validation", valClassStats, prev?.classification?.validation);
+
+  if (prev) {
+    const fieldRegressions: string[] = [];
+    const fieldImprovements: string[] = [];
+    for (const split of ["training", "validation"] as Split[]) {
+      const agg = split === "training" ? trainAgg : valAgg;
+      for (const field of FIELDS) {
+        const stat = agg[field];
+        if (!stat.total) continue;
+        const currPct = pct(stat.correct, stat.total);
+        const prevStat = prev.fields?.[split]?.[field];
+        if (!prevStat?.total) continue;
+        const prevPct = pct(prevStat.correct, prevStat.total);
+        const d = currPct - prevPct;
+        const label = `${field} (${split})`;
+        if (d <= -0.05) fieldRegressions.push(`${label} ${fmtDelta(currPct, prevPct)}`);
+        else if (d >= 0.05) fieldImprovements.push(`${label} ${fmtDelta(currPct, prevPct)}`);
+      }
+    }
+    if (fieldRegressions.length) console.log(`\nField regressions: ${fieldRegressions.join(", ")}`);
+    if (fieldImprovements.length) console.log(`Field improvements: ${fieldImprovements.join(", ")}`);
+
+    const imageRegressions: string[] = [];
+    const imageImprovements: string[] = [];
+    for (const [filename, currPct] of Object.entries(perImagePct)) {
+      const prevPct = prev.perImage?.[filename];
+      if (prevPct === undefined) continue;
+      const d = currPct - prevPct;
+      if (d <= -0.5) imageRegressions.push(`${filename} ${fmtDelta(currPct, prevPct)}`);
+      else if (d >= 0.5) imageImprovements.push(`${filename} ${fmtDelta(currPct, prevPct)}`);
+    }
+    if (imageRegressions.length) console.log(`\nImage regressions: ${imageRegressions.join(", ")}`);
+    if (imageImprovements.length) console.log(`Image improvements: ${imageImprovements.join(", ")}`);
+
+    console.log(`\n(vs run at ${prev.timestamp}${prev.commit !== "unknown" ? `, commit ${prev.commit}` : ""})`);
+  } else {
+    console.log("\n(no previous run in product_accuracy_history.jsonl — this is the baseline)");
+  }
+  console.log("");
+}
+
 async function main() {
   const args = parseArgs(process.argv.slice(2));
   await checkServerReachable(args.baseUrl);
@@ -116,12 +331,14 @@ async function main() {
     process.exit(1);
   }
   const labels: GroundTruth[] = JSON.parse(fs.readFileSync(LABELS_PATH, "utf8"));
+  const prev = loadLastHistoryEntry();
 
   const results = {
-    training: [] as { gt: GroundTruth; checks: Check[] }[],
-    validation: [] as { gt: GroundTruth; checks: Check[] }[],
+    training: [] as ResultItem[],
+    validation: [] as ResultItem[],
     failed: [] as string[]
   };
+  const perImagePct: Record<string, number> = {};
 
   for (const gt of labels) {
     if (gt.filename.startsWith("uploaded-")) continue; // Skip phantom
@@ -135,7 +352,7 @@ async function main() {
     try {
       const b64 = "data:image/jpeg;base64," + fs.readFileSync(imgPath, "base64");
       const parsed = await fetchScan(args.baseUrl, b64);
-      
+
       const bestMatchSku = parsed.possibleMatches?.find(m => m.isBestMatch)?.no_sku || "";
       const predictedItemName = parsed.classification?.top1_name || "";
       const predictedExpiry = parsed.ocr?.extracted_expired_date || "";
@@ -146,13 +363,21 @@ async function main() {
         { field: "expiry_date", match: isMatch(gt.expiry_date, predictedExpiry) }
       ];
 
+      const item: ResultItem = {
+        gt,
+        checks,
+        method: parsed.classification?.method,
+        confidence: parsed.classification?.top1_confidence
+      };
+
       if (gt.filename.includes("/")) {
-        results.training.push({ gt, checks });
+        results.training.push(item);
       } else {
-        results.validation.push({ gt, checks });
+        results.validation.push(item);
       }
-      
+
       const score = checks.filter(c => c.match).length;
+      perImagePct[gt.filename] = (score / checks.length) * 100;
       console.log(`done (${score}/3)`);
     } catch (err) {
       console.log(`FAILED (${(err as Error).message})`);
@@ -160,42 +385,22 @@ async function main() {
     }
   }
 
-  const aggregate = (list: { checks: Check[] }[]) => {
-    const agg: Record<string, { correct: number; total: number }> = {
-      no_sku: { correct: 0, total: 0 },
-      nama_item: { correct: 0, total: 0 },
-      expiry_date: { correct: 0, total: 0 }
-    };
-    for (const item of list) {
-      for (const check of item.checks) {
-        agg[check.field].total++;
-        if (check.match) agg[check.field].correct++;
-      }
-    }
-    return agg;
-  };
+  const trainAgg = aggregateFields(results.training);
+  const valAgg = aggregateFields(results.validation);
+  const trainClassStats = aggregateClassification(results.training);
+  const valClassStats = aggregateClassification(results.validation);
+  const imageCount = { training: results.training.length, validation: results.validation.length };
 
-  const trainAgg = aggregate(results.training);
-  const valAgg = aggregate(results.validation);
-
-  console.log("\n=== Product Scan Accuracy Summary ===");
-  console.log(`Training Images: ${results.training.length} | Validation Images: ${results.validation.length} | Failed: ${results.failed.length}\n`);
-
-  console.log("Field          | Training Set | Validation Set");
-  console.log("---------------|--------------|---------------");
-  ["no_sku", "nama_item", "expiry_date"].forEach(f => {
-    const t = trainAgg[f].total ? fmtPct(pct(trainAgg[f].correct, trainAgg[f].total)) : "n/a";
-    const v = valAgg[f].total ? fmtPct(pct(valAgg[f].correct, valAgg[f].total)) : "n/a";
-    console.log(`${f.padEnd(14)} | ${t.padEnd(12)} | ${v.padEnd(14)}`);
-  });
-  console.log("");
+  printSummary(trainAgg, valAgg, trainClassStats, valClassStats, perImagePct, prev, imageCount, results.failed);
 
   const entry: HistoryEntry = {
     timestamp: new Date().toISOString(),
     commit: getGitCommit(),
-    imageCount: { training: results.training.length, validation: results.validation.length },
+    imageCount,
     failedImages: results.failed,
-    fields: { training: trainAgg, validation: valAgg }
+    fields: { training: trainAgg, validation: valAgg },
+    classification: { training: trainClassStats, validation: valClassStats },
+    perImage: perImagePct
   };
   fs.appendFileSync(HISTORY_PATH, JSON.stringify(entry) + "\n");
 }
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diff --git a/backend/sources/product-test-images/README.md b/backend/sources/product-test-images/README.md
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+# Product-scan validation images
+
+This folder is the **validation/test set** for the product-scan accuracy
+harness (`backend/scripts/accuracy-check-scan.mts`) — real-world photos that
+are *not* part of the classifier's reference dataset, so scoring against them
+measures actual accuracy instead of memorization.
+
+**Workflow:**
+1. Drop a photo here directly (flat, no subfolders — a filename with no `/`
+   is what marks an image as "validation" instead of "training").
+2. Label it via the `/manual-label-scan` page (correct `no_sku`, `nama_item`,
+   `expiry_date` by hand — don't just accept the AI-scan prefill, that would
+   make the ground truth equal to the model's own prediction).
+3. Run `node scripts/accuracy-check-scan.mts` from `backend/` — the photo now
+   scores under "Validation Set", separate from "Training Set".
+
+**This is not where new training photos go.** To improve the classifier
+itself (DINOv2 index / YOLO fine-tune), add photos to
+`pfm-web-app/public/produk-pfm/foto-kemasan-v2/<SKU folder>/` instead, then
+reindex/retrain per `docs/scan-product.md`'s "Model artifacts & retraining"
+section.