diff --git a/database/schema.py b/database/schema.py
index e6bd738..717b5aa 100644
--- a/database/schema.py
+++ b/database/schema.py
@@ -18,6 +18,7 @@ def _migrate(conn):
         ("declared_property_count", "INTEGER"),
         ("image_hash", "TEXT"),
         ("duplicate_of", "INTEGER"),
+        ("duplicate_dismissed", "INTEGER DEFAULT 0"),
     ]
     for col, col_type in migrations:
         if col not in existing:
diff --git a/routers/documents.py b/routers/documents.py
index 2acba5b..ecc38eb 100644
--- a/routers/documents.py
+++ b/routers/documents.py
@@ -281,7 +281,8 @@ async def scan_duplicates():
         for g in hash_groups:
             result = conn.execute(
                 """UPDATE documents SET duplicate_of=?
-                   WHERE image_hash=? AND id != ? AND status != 'staged'""",
+                   WHERE image_hash=? AND id != ? AND status != 'staged'
+                     AND COALESCE(duplicate_dismissed, 0) = 0""",
                 (g["keeper"], g["image_hash"], g["keeper"]),
             )
             flagged_by_hash += result.rowcount or 0
@@ -307,6 +308,7 @@ async def scan_duplicates():
                      AND COALESCE(TRIM(page_info),'')=?
                      AND id != ?
                      AND duplicate_of IS NULL
+                     AND COALESCE(duplicate_dismissed, 0) = 0
                      AND status IN ('extracted','confirmed')""",
                 (g["keeper"], g["rn"], g["sc"], g["pi"], g["keeper"]),
             )
@@ -395,16 +397,21 @@ async def delete_all_duplicates():
 
 @router.post("/documents/{doc_id}/unflag-duplicate")
 async def unflag_duplicate(doc_id: int):
-    """Mark a flagged-duplicate document as NOT a duplicate (clear duplicate_of)."""
+    """Mark a flagged-duplicate document as NOT a duplicate (clear duplicate_of
+    and remember the decision so future scans don't re-flag it)."""
     with get_db() as conn:
         row = conn.execute(
-            "SELECT id FROM documents WHERE id=? AND duplicate_of IS NOT NULL",
+            "SELECT id FROM documents WHERE id=?",
             (doc_id,),
         ).fetchone()
         if not row:
-            return JSONResponse({"error": "not flagged"}, status_code=404)
+            return JSONResponse({"error": "not found"}, status_code=404)
         conn.execute(
-            "UPDATE documents SET duplicate_of=NULL, updated_at=CURRENT_TIMESTAMP WHERE id=?",
+            """UPDATE documents
+               SET duplicate_of=NULL,
+                   duplicate_dismissed=1,
+                   updated_at=CURRENT_TIMESTAMP
+               WHERE id=?""",
             (doc_id,),
         )
     return JSONResponse({"ok": True})
diff --git a/routers/upload.py b/routers/upload.py
index 3fe50a8..7e58217 100644
--- a/routers/upload.py
+++ b/routers/upload.py
@@ -35,11 +35,13 @@ def _hash_file(path: Path) -> str:
 
 
 def _find_duplicate(conn, image_hash: str) -> dict | None:
-    """Return an existing non-staged document sharing the same image hash."""
+    """Return an existing non-staged document sharing the same image hash.
+    Skips rows the user has explicitly dismissed as 'not a duplicate'."""
     row = conn.execute(
         """SELECT id, status, image_path, person_id, request_number
            FROM documents
            WHERE image_hash=? AND status != 'staged'
+             AND COALESCE(duplicate_dismissed, 0) = 0
            ORDER BY id LIMIT 1""",
         (image_hash,),
     ).fetchone()
@@ -126,14 +128,21 @@ async def _extract_and_save(doc_id: int, image_path: str, provider: str = ""):
                          AND COALESCE(search_scope,'')=?
                          AND COALESCE(page_info,'')=?
                          AND status IN ('extracted','confirmed')
+                         AND COALESCE(duplicate_dismissed, 0) = 0
                        ORDER BY id LIMIT 1""",
                     (doc_id, req_num, scope, page_info),
                 ).fetchone()
                 if existing:
-                    conn.execute(
-                        "UPDATE documents SET duplicate_of=? WHERE id=?",
-                        (existing["id"], doc_id),
-                    )
+                    # Only auto-flag if THIS document hasn't itself been dismissed.
+                    self_row = conn.execute(
+                        "SELECT COALESCE(duplicate_dismissed, 0) AS d FROM documents WHERE id=?",
+                        (doc_id,),
+                    ).fetchone()
+                    if not (self_row and self_row["d"]):
+                        conn.execute(
+                            "UPDATE documents SET duplicate_of=? WHERE id=?",
+                            (existing["id"], doc_id),
+                        )
 
     except Exception as e:
         with get_db() as conn:
diff --git a/templates/duplicates.html b/templates/duplicates.html
index 7183de9..7b28540 100644
--- a/templates/duplicates.html
+++ b/templates/duplicates.html
@@ -206,15 +206,26 @@ async function deleteDoc(docId, btn) {
 }
 
 async function unflagDuplicate(docId, btn) {
-  if (!confirm('تأكيد أنها ليست وثيقة مكررة؟')) return;
+  const original = btn.textContent;
   btn.disabled = true;
-  const res = await fetch(`/documents/${docId}/unflag-duplicate`, { method: 'POST' });
-  if (res.ok) {
-    document.getElementById(`card-${docId}`)?.remove();
-  } else {
-    alert('فشل التحديث.');
-    btn.disabled = false;
+  btn.textContent = '...';
+  try {
+    const res = await fetch(`/documents/${docId}/unflag-duplicate`, {
+      method: 'POST',
+      headers: { 'Accept': 'application/json' },
+    });
+    if (res.ok) {
+      document.getElementById(`card-${docId}`)?.remove();
+      return;
+    }
+    let msg = `HTTP ${res.status}`;
+    try { const j = await res.json(); if (j.error) msg += ` — ${j.error}`; } catch (_) {}
+    alert(`فشل التحديث: ${msg}`);
+  } catch (e) {
+    alert(`خطأ في الشبكة: ${e.message}`);
   }
+  btn.disabled = false;
+  btn.textContent = original;
 }
 
 async function deleteAllDuplicates(btn) {