feat(sxyprn): mark dead posts during thumbnail refresh sweep

resolve_post() now distinguishes "Post Not Found" (mark dead_at — the
link wouldn't play anyway) from a live page with no fresh poster (leave
untouched), on top of the existing thumbnail refresh. Batched into
refresh_batch() with refreshed/dead/untouched counters.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

scripts/refresh_sxyprn_thumbs.py

@@ -1,14 +1,18 @@
-"""Odśwież wygasłe miniaturki sxyprn z ich (żywych) stron post (bug 2026-06-10).
+"""Odśwież wygasłe miniaturki sxyprn z (żywych) stron post + oznacz martwe (bug 2026-06-10).
 
 sxyprn/trafficdeposit thumbnaile są podpisane czasowo i ROTUJĄ (token wygasa po
-~tygodniach → 404), ALE sama strona /post/<id>.html ŻYJE (200) i zawiera świeży
-poster sceny w `og:image` / `<video poster=>` (post-id w ścieżce, current timestamp).
-Search/listingi NIE re-surfaceują starych postów (0 overlap), więc jedyna droga to
-pobranie per-post page.
+~tygodniach → 404), ALE żywa strona /post/<id>.html zawiera świeży poster sceny w
+`og:image` / `<video poster>` (post-id w ścieżce, current timestamp). Search/listingi
+NIE re-surfaceują starych postów (0 overlap), więc jedyna droga to per-post page fetch.
 
-Strategia: iteruj żywe sxyprn playback_sources, fetch post page, wyłuskaj og:image
-(fresh signed thumbnail), UPDATE thumbnail_url. Wznawialne (--offset), idempotent.
-Thumbnaile dalej rotują → odpalać periodycznie (scheduled job _job_refresh_sxyprn_thumbs).
+Trzy wyniki per źródło:
+  - 'thumb' → strona żyje + ma świeży poster → UPDATE thumbnail_url
+  - 'dead'  → "Post Not Found" (post skasowany na sxyprn) → mark dead_at (martwy link,
+              nie tylko brak miniatury — i tak by nie zagrał)
+  - 'none'  → fetch fail / brak postera ale strona żyje → zostaw bez zmian
+
+Wznawialne (--offset), idempotent. Thumbnaile rotują → odpalać periodycznie
+(_job_refresh_sxyprn_thumbs co 12h).
 
 Użycie (kontener worker):
   python scripts/refresh_sxyprn_thumbs.py [--limit N] [--offset M]
@@ -29,24 +33,53 @@ _OG_RE2 = re.compile(r"content=[\"']([^\"']+)[\"'][^>]*property=[\"']og:image",
 _POSTER_RE = re.compile(r"<video[^>]*poster=[\"']([^\"']+)", re.IGNORECASE)
 
 
-def _fresh_thumb(page_url: str) -> str | None:
-    """Pobierz post page → świeży poster (og:image / video poster). None gdy strona
-    martwa (Post Not Found) albo brak postera."""
+def resolve_post(page_url: str) -> tuple[str, str | None]:
+    """Zwraca ('thumb', url) | ('dead', None) | ('none', None)."""
     try:
         html = browser_get(page_url, timeout=25).text
     except Exception:
-        return None
+        return ("none", None)
     if "Post Not Found" in html:
-        return None
+        return ("dead", None)
     m = _OG_RE.search(html) or _OG_RE2.search(html) or _POSTER_RE.search(html)
     if not m:
-        return None
+        return ("none", None)
     u = m.group(1).strip()
     if u.startswith("//"):
         u = "https:" + u
     if "trafficdeposit.com" not in u and "sxyprn" not in u:
-        return None
-    return u
+        return ("none", None)
+    return ("thumb", u)
+
+
+def refresh_batch(rows: list[tuple]) -> tuple[int, int, int]:
+    """rows: [(pb_id, page_url), ...]. Returns (refreshed, marked_dead, untouched)."""
+    refreshed = marked_dead = untouched = 0
+    for pbid, page_url in rows:
+        status, val = resolve_post(page_url)
+        if status == "thumb":
+            with session_scope() as s:
+                s.execute(
+                    text("UPDATE playback_sources SET thumbnail_url=:t WHERE id=:i").bindparams(
+                        t=val, i=pbid
+                    )
+                )
+                s.commit()
+            refreshed += 1
+        elif status == "dead":
+            with session_scope() as s:
+                s.execute(
+                    text(
+                        "UPDATE playback_sources SET dead_at=now(), "
+                        "dead_reason='sxyprn Post Not Found (refresh sweep)' WHERE id=:i"
+                    ).bindparams(i=pbid)
+                )
+                s.commit()
+            marked_dead += 1
+        else:
+            untouched += 1
+        time.sleep(0.25)
+    return refreshed, marked_dead, untouched
 
 
 def main() -> None:
@@ -67,27 +100,19 @@ def main() -> None:
             ).bindparams(off=offset, lim=limit)
         ).all()
 
-    print(f"sxyprn sources to refresh: {len(rows)} (offset={offset})", flush=True)
-    updated = 0
-    dead = 0
-    nothumb = 0
-    for idx, (pbid, page_url) in enumerate(rows):
-        thumb = _fresh_thumb(page_url)
-        if thumb:
-            with session_scope() as s:
-                s.execute(
-                    text("UPDATE playback_sources SET thumbnail_url=:t WHERE id=:i").bindparams(
-                        t=thumb, i=pbid
-                    )
-                )
-                s.commit()
-            updated += 1
-        else:
-            nothumb += 1
-        if (idx + 1) % 200 == 0:
-            print(f"  {idx+1}/{len(rows)} updated={updated} no_thumb={nothumb}", flush=True)
-        time.sleep(0.25)
-    print(f"DONE refreshed={updated}/{len(rows)} no_thumb={nothumb}", flush=True)
+    print(f"sxyprn sources: {len(rows)} (offset={offset})", flush=True)
+    refreshed = marked_dead = untouched = 0
+    CHUNK = 200
+    for i in range(0, len(rows), CHUNK):
+        r, d, u = refresh_batch(rows[i : i + CHUNK])
+        refreshed += r
+        marked_dead += d
+        untouched += u
+        print(
+            f"  {min(i+CHUNK, len(rows))}/{len(rows)} refreshed={refreshed} dead={marked_dead} untouched={untouched}",
+            flush=True,
+        )
+    print(f"DONE refreshed={refreshed} dead={marked_dead} untouched={untouched}", flush=True)
 
 
 if __name__ == "__main__":