From ee7550c890b7fea142813afcd4d94779e749a29f Mon Sep 17 00:00:00 2001
From: Drsakura <Drsakura@users.noreply.github.com>
Date: Fri, 23 Oct 2026 13:52:14 +0800
Subject: [PATCH] =?UTF-8?q?fix(data):=20=E6=B8=85=E7=90=86=E4=B8=B4?=
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transfers/ 下面还套着 multer 的 uploads/ 子目录；原来只清理一层，目录本身会被当成过期文件去 unlink（失败但刷日志），
而 uploads/ 里因体积超限被丢弃的残片又永远不会被清。现在只删普通文件，并两处都清。
---
 backend/lib/dataTransfer/index.js | 2 ++
 backend/routes/dataTransfer.js    | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/backend/lib/dataTransfer/index.js b/backend/lib/dataTransfer/index.js
index 6f62d97..5dc57bb 100644
--- a/backend/lib/dataTransfer/index.js
+++ b/backend/lib/dataTransfer/index.js
@@ -122,6 +122,8 @@ function cleanupUploads(dir, { maxAgeMs = 24 * 60 * 60 * 1000 } = {}) {
       const file = path.join(dir, name)
       try {
         const stat = fs.statSync(file)
+        /* 只删普通文件：目录里还套着 multer 的 uploads/，别把目录本身当过期文件删 */
+        if (!stat.isFile()) continue
         if (Date.now() - stat.mtimeMs > maxAgeMs) { fs.unlinkSync(file); removed++ }
       } catch { /* 单个文件失败不影响其它清理 */ }
     }
diff --git a/backend/routes/dataTransfer.js b/backend/routes/dataTransfer.js
index 5b68933..ca9881a 100644
--- a/backend/routes/dataTransfer.js
+++ b/backend/routes/dataTransfer.js
@@ -121,6 +121,8 @@ router.post('/import/preview', guard, upload.single('file'), async (req, res) =>
     fs.renameSync(req.file.path, target)
     /* 顺手清掉 24 小时前的旧包，避免上传目录无限增长（本次刚移入的 mtime 是现在，不会被删） */
     transfer.cleanupUploads(TRANSFER_DIR)
+    /* multer 落盘后因体积/字段错误被丢弃的残片留在 uploads/，一并清 */
+    transfer.cleanupUploads(UPLOAD_DIR)
 
     const categories = parseCategories(req.body?.categories)
     const preview = await transfer.previewImport(db, target, {