diff --git a/app/api/routers/database.py b/app/api/routers/database.py
index f86bd6c..4b1a270 100644
--- a/app/api/routers/database.py
+++ b/app/api/routers/database.py
@@ -1,5 +1,4 @@
 import re
-from contextlib import suppress
 from datetime import datetime
 from pathlib import Path
 from typing import Optional
@@ -12,17 +11,13 @@ from starlette.background import BackgroundTask
 from app import state
 from app.config import CACHE_DIR
 from app.database import DatabaseManager
+from app.utils.files import remove_file_safely
 
 
 router = APIRouter(tags=["database"])
 INVALID_SHEET_NAME_CHARS = re.compile(r"[:\\/?*\[\]]")
 
 
-def _remove_file(path: Path) -> None:
-    with suppress(OSError):
-        path.unlink()
-
-
 def _resolve_requested_tables(
     table_name: Optional[str],
     table_names: Optional[list[str]],
@@ -227,12 +222,12 @@ async def download_table(
                     df.to_excel(writer, sheet_name=_make_sheet_name(name, used_sheet_names), index=False)
             media_type = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
     except Exception:
-        _remove_file(filepath)
+        remove_file_safely(filepath)
         raise
 
     return FileResponse(
         path=str(filepath),
         filename=filename,
         media_type=media_type,
-        background=BackgroundTask(_remove_file, filepath),
+        background=BackgroundTask(remove_file_safely, filepath),
     )
diff --git a/app/api/routers/history.py b/app/api/routers/history.py
index a0d6a09..479bed0 100644
--- a/app/api/routers/history.py
+++ b/app/api/routers/history.py
@@ -1,5 +1,4 @@
 import zipfile
-from contextlib import suppress
 from datetime import datetime
 from pathlib import Path
 from typing import Any
@@ -10,17 +9,12 @@ from starlette.background import BackgroundTask
 
 from app import state
 from app.config import CACHE_DIR
-from app.utils.files import format_size, get_dir_size
+from app.utils.files import format_size, get_dir_size, remove_file_safely
 
 
 router = APIRouter(tags=["history"])
 
 
-def _remove_file(path: Path) -> None:
-    with suppress(OSError):
-        path.unlink()
-
-
 def _safe_filename_part(value: str) -> str:
     safe = "".join(char if char.isalnum() or char in {"-", "_"} else "_" for char in value)
     return safe.strip("_") or "history"
@@ -202,14 +196,14 @@ async def download_history(record_id: str = Body(..., embed=True)):
     try:
         _zip_directory(work_dir, archive_path)
     except Exception:
-        _remove_file(archive_path)
+        remove_file_safely(archive_path)
         raise
 
     return FileResponse(
         path=str(archive_path),
         filename=filename,
         media_type="application/zip",
-        background=BackgroundTask(_remove_file, archive_path),
+        background=BackgroundTask(remove_file_safely, archive_path),
     )
 
 
@@ -238,12 +232,12 @@ async def download_history_file(
     try:
         _zip_history_item(target_path, archive_path)
     except Exception:
-        _remove_file(archive_path)
+        remove_file_safely(archive_path)
         raise
 
     return FileResponse(
         path=str(archive_path),
         filename=filename,
         media_type="application/zip",
-        background=BackgroundTask(_remove_file, archive_path),
+        background=BackgroundTask(remove_file_safely, archive_path),
     )
diff --git a/app/utils/files.py b/app/utils/files.py
index dbe698f..9d64b93 100644
--- a/app/utils/files.py
+++ b/app/utils/files.py
@@ -1,6 +1,13 @@
 from pathlib import Path
 
 
+def remove_file_safely(path: Path) -> None:
+    try:
+        path.unlink()
+    except OSError:
+        pass
+
+
 def get_dir_size(path: Path) -> int:
     total_size = 0
     try:
@@ -26,4 +33,3 @@ def format_size(size_bytes: int) -> str:
             return f"{value:.2f} {unit}"
         value /= 1024.0
     return f"{value:.2f} PB"
-
diff --git a/docs/project_context.md b/docs/project_context.md
index c8d0355..ee71461 100644
--- a/docs/project_context.md
+++ b/docs/project_context.md
@@ -632,3 +632,9 @@
 - `app/api/routers/task_runtime.py` centralizes shared task-stage updates, processing license log output, and safe history-retention cleanup for manual processing and remote processing routes.
 - `app/api/routers/tasks.py` and `app/api/routers/remote.py` now reuse the shared helpers instead of carrying duplicate `_set_task_stage` and `_log_license_check` implementations.
 - Verification performed: `.venv\Scripts\python.exe -m compileall app`, `npm run build`, and `cargo check --manifest-path src-tauri\Cargo.toml` with a temporary sidecar placeholder all passed. Generated build output, Python caches, and temporary Tauri sidecar files were removed after verification.
+
+## 2026-06-01: Download cleanup helper
+
+- `app/utils/files.py` now provides `remove_file_safely()` for best-effort temporary file cleanup.
+- Database table export and history archive download routes now reuse this helper instead of carrying duplicate private `_remove_file()` functions.
+- Verification performed: `.venv\Scripts\python.exe -m compileall app`, `npm run build`, and `cargo check --manifest-path src-tauri\Cargo.toml` with a temporary sidecar placeholder all passed. Generated build output, Python caches, and temporary Tauri sidecar files were removed after verification.