diff --git a/scripts/merge_dupe_thumb_asset.py b/scripts/merge_dupe_thumb_asset.py
new file mode 100644
index 0000000..0cb8a81
--- /dev/null
+++ b/scripts/merge_dupe_thumb_asset.py
@@ -0,0 +1,115 @@
+"""Merge tube-dup po asset-id miniatury (rodzina hdporn.gg / fullmovies.xxx).
+
+Te siostrzane platformy dzielą jedną przestrzeń id wideo i ingestują ten sam film pod
+RÓŻNYMI tytułami → bulk_dedup tego nie łapie (różne tytuły, brak phash, exact-title-merge
+nie działa). Sygnał: identyczny asset-id w ścieżce miniatury `/<bucket>000/<id>/` na
+`img.hdporn.gg` LUB `img.fullmovies.xxx` + IDENTYCZNA długość (co do sekundy) = ten sam
+film (zweryfikowane 2026-06-14, próbka = realne dupy; report 205b17d9 / 5a2944cb).
+
+KRYTYCZNE: wspólny id-space istnieje TYLKO dla tej pary hostów. Inne CDN-y z tym samym
+wzorcem ścieżki (ptx.cdntrex, porn00, freshporno, pornhat...) reużywają te numery dla
+NIEpowiązanych filmów — grupowanie cross-host po gołym numerze daje fałszywe pary
+(dry-run 2026-06-14: "UsePOV Gia Paige" vs "chelsie rae bikini squad" pod tym samym
+numerem). Stąd twarde `~ img.(hdporn.gg|fullmovies.xxx)` + guard długości (GROUP BY
+asset_id, dur → różna długość przy tym samym numerze NIE jest łączona).
+
+Keep = scena z największą liczbą external_refs → playback_sources → najstarsza.
+Merge przez resolve.scene_merge.merge_scenes (przenosi refs/performers/tags/fingerprints/
+playback_sources, kasuje drop).
+
+Użycie (kontener worker):
+  python scripts/merge_dupe_thumb_asset.py [STUDIO_ID] [--commit]
+Bez STUDIO_ID = global. Bez --commit = dry-run.
+"""
+from __future__ import annotations
+
+import sys
+import uuid as _u
+
+from sqlalchemy import text
+
+from app.db import session_scope
+from app.resolve.scene_merge import merge_scenes
+
+_HOST_RE = r"://img\.(hdporn\.gg|fullmovies\.xxx)/[0-9]+000/[0-9]+/"
+
+
+def _args() -> tuple[str | None, bool]:
+    commit = "--commit" in sys.argv
+    studio = None
+    for a in sys.argv[1:]:
+        if not a.startswith("--") and len(a) >= 32:
+            studio = a
+    return studio, commit
+
+
+def _groups(studio_id: str | None) -> list[list[str]]:
+    where_studio = "AND s.studio_id = :sid" if studio_id else ""
+    sql = f"""
+    WITH cand AS (
+      SELECT DISTINCT s.id,
+             substring(p.thumbnail_url from '/[0-9]+000/([0-9]+)/') AS asset_id,
+             s.duration_sec dur,
+             s.created_at,
+             (SELECT count(*) FROM scene_external_refs r WHERE r.scene_id=s.id) refs,
+             (SELECT count(*) FROM playback_sources pp WHERE pp.scene_id=s.id) srcs
+      FROM scenes s
+      JOIN playback_sources p ON p.scene_id=s.id
+      WHERE p.thumbnail_url ~ '{_HOST_RE}'
+        AND p.dead_at IS NULL
+        AND s.duration_sec IS NOT NULL
+        {where_studio}
+    )
+    SELECT array_agg(id::text ORDER BY refs DESC, srcs DESC, created_at ASC) members
+    FROM cand
+    WHERE asset_id IS NOT NULL
+    GROUP BY asset_id, dur
+    HAVING count(DISTINCT id) > 1
+    """
+    params = {"sid": studio_id} if studio_id else {}
+    with session_scope() as s:
+        rows = s.execute(text(sql), params).all()
+    seen: set[frozenset] = set()
+    out: list[list[str]] = []
+    for (members,) in rows:
+        key = frozenset(members)
+        if key in seen:
+            continue
+        seen.add(key)
+        out.append(list(members))
+    return out
+
+
+def main() -> None:
+    studio_id, commit = _args()
+    groups = _groups(studio_id)
+    pairs = sum(len(g) - 1 for g in groups)
+    print(
+        f"studio={studio_id or 'ALL'} groups={len(groups)} merges={pairs} commit={commit}",
+        flush=True,
+    )
+    merged = errors = 0
+    for g in groups:
+        keep = g[0]
+        for drop in g[1:]:
+            if not commit:
+                print(f"  [dry] keep {keep[:8]} <- drop {drop[:8]}")
+                continue
+            try:
+                with session_scope() as s:
+                    merge_scenes(
+                        s, keep_id=_u.UUID(keep), drop_id=_u.UUID(drop),
+                        resolved_by="merge_dupe_thumb_asset",
+                    )
+                merged += 1
+                if merged % 500 == 0:
+                    print(f"  progress merged={merged}/{pairs} errors={errors}", flush=True)
+            except Exception as e:
+                errors += 1
+                if errors <= 20:
+                    print(f"  ERR keep {keep[:8]} drop {drop[:8]}: {str(e)[:120]}")
+    print(f"DONE merged={merged}/{pairs} errors={errors}", flush=True)
+
+
+if __name__ == "__main__":
+    main()