Revert "Backfill watchlist alternative titles lazily"

This reverts commit 8aa490adf8.

app.py

@@ -1875,54 +1875,6 @@ class WatchlistStore:
                 continue
         return {"items": updated}
 
-    def ensure_alt_titles(self, show_id, force=False):
-        item = self.get(show_id)
-        if not force and (item.get("alt_titles") or item.get("english_title")):
-            return item
-        parsed = fetch_allmanga_alternative_titles(item["show_id"], item.get("title"), timeout=self._refresh_request_timeout())
-        updated_at = now_iso()
-        alt_titles_json = json.dumps(unique_title_values(parsed.get("alt_titles") or [], item.get("title")))
-        with self.lock, self._connect() as conn:
-            conn.execute(
-                """
-                UPDATE watchlist
-                SET english_title = ?, alt_titles_json = ?, updated_at = ?
-                WHERE show_id = ?
-                """,
-                (
-                    parsed.get("english_title") or None,
-                    alt_titles_json,
-                    updated_at,
-                    item["show_id"],
-                ),
-            )
-        return self.get(show_id)
-
-    def ensure_alt_titles_many(self, show_ids, limit=6, force=False):
-        normalized = []
-        for show_id in show_ids:
-            text = str(show_id or "").strip()
-            if text and text not in normalized:
-                normalized.append(text)
-        updated = []
-        for show_id in normalized[: max(1, min(int(limit or 6), 10))]:
-            try:
-                item = self.get(show_id)
-            except KeyError:
-                continue
-            if not force and (item.get("alt_titles") or item.get("english_title")):
-                updated.append(item)
-                continue
-            try:
-                updated.append(self.ensure_alt_titles(show_id, force=force))
-            except Exception as exc:
-                debug_log("watchlist.alt_titles.ensure_failed", show_id=show_id, error=exc)
-                try:
-                    updated.append(self.get(show_id))
-                except KeyError:
-                    continue
-        return {"items": updated}
-
 
 def add_to_watchlist(payload):
     ensure_runtime()