title modification

sentence_api/repository.py

@@ -349,6 +349,22 @@ class VideoRepository:
                 (remote_url, utc_now(), normalize_video_hash(video_hash)),
             )
 
+    def update_title(self, video_hash: str, title: str) -> Optional[Dict[str, Any]]:
+        normalized_hash = normalize_video_hash(video_hash)
+        cleaned_title = title.strip()[:200]
+        if not cleaned_title:
+            raise ValueError("Title cannot be empty.")
+
+        with self._connect() as connection:
+            cursor = connection.execute(
+                "UPDATE videos SET title = ?, updated_at = ? WHERE video_hash = ?",
+                (cleaned_title, utc_now(), normalized_hash),
+            )
+            if cursor.rowcount == 0:
+                return None
+
+        return self.get_video(normalized_hash)
+
     def list_videos(self) -> List[Dict[str, Any]]:
         with self._connect() as connection:
             rows = connection.execute(