Optimize agent tool async blocking paths

app/db/downloadhistory_oper.py

@@ -1,4 +1,4 @@
-from typing import List, Optional
+from typing import Dict, List, Optional
 
 from app.db import DbOper
 from app.db.models.downloadhistory import DownloadHistory, DownloadFiles
@@ -23,6 +23,17 @@ class DownloadHistoryOper(DbOper):
         """
         return DownloadHistory.get_by_hash(self._db, download_hash)
 
+    def get_by_hashes(self, download_hashes: List[str]) -> Dict[str, DownloadHistory]:
+        """
+        批量按 Hash 查询下载记录，并返回以 Hash 为键的映射。
+        """
+        histories = DownloadHistory.get_by_hashes(self._db, download_hashes)
+        return {
+            history.download_hash: history
+            for history in histories
+            if history and history.download_hash
+        }
+
     def get_by_mediaid(self, tmdbid: int, doubanid: str) -> List[DownloadHistory]:
         """
         按媒体ID查询下载记录