diff --git a/packages/backend/src/cloud/cloud.service.ts b/packages/backend/src/cloud/cloud.service.ts
index f2ce91a..70e488d 100644
--- a/packages/backend/src/cloud/cloud.service.ts
+++ b/packages/backend/src/cloud/cloud.service.ts
@@ -70,14 +70,14 @@ async function doSaveFromShare(shareUrl: string, cloudType: string, sourceTitle?
       if (alreadySaved && recentRecord.share_url) {
         console.log(`[Share] 🛡️ Dedup: ${shareUrl} was saved ${DEDUP_WINDOW_SEC}s ago (status=${recentRecord.status}), returning existing share link`);
         db.prepare(
-          `INSERT INTO save_records (source_type, source_title, source_url, target_cloud, share_url, share_pwd, file_size, file_count, folder_count, duration_ms, status, error_message, folder_name, original_folder_name, ip_address, ip_location, created_at)
-           VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`
+          `INSERT INTO save_records (source_type, source_title, source_url, target_cloud, share_url, share_pwd, file_size, file_count, folder_count, duration_ms, status, error_message, folder_name, original_folder_name, ip_address, ip_location, created_at, config_id)
+           VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`
         ).run(
           cloudType, sourceTitle || null, shareUrl, cloudType,
           recentRecord.share_url, recentRecord.share_pwd || null,
           null, 0, 0, 0, 'reused', null,
           recentRecord.folder_name || null, recentRecord.original_folder_name || null,
-          ipAddress || null, ipLocation, localTimestamp(),
+          ipAddress || null, ipLocation, localTimestamp(), null,
         );
         return {
           success: true,
@@ -141,7 +141,7 @@ async function doSaveFromShare(shareUrl: string, cloudType: string, sourceTitle?
   }
 
   // ── Unified credential validation ──
-  const credential = await getAndValidateCredential(cloudType, ipAddress);
+  const credential = await getAndValidateCredential(cloudType, ipAddress, shareUrl);
   if (!credential.valid || !credential.config) {
     return { success: false, message: credential.message };
   }
@@ -189,8 +189,8 @@ async function doSaveFromShare(shareUrl: string, cloudType: string, sourceTitle?
     }
 
     db.prepare(
-      `INSERT INTO save_records (source_type, source_title, source_url, target_cloud, share_url, share_pwd, file_size, file_count, folder_count, duration_ms, status, error_message, folder_name, original_folder_name, ip_address, ip_location, created_at)
-       VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`
+      `INSERT INTO save_records (source_type, source_title, source_url, target_cloud, share_url, share_pwd, file_size, file_count, folder_count, duration_ms, status, error_message, folder_name, original_folder_name, ip_address, ip_location, created_at, config_id)
+       VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`
     ).run(
       cloudType, sourceTitle || driverResult.folderName || null, shareUrl, cloudType,
       driverResult.shareUrl || null, driverResult.sharePwd || null,
@@ -198,7 +198,7 @@ async function doSaveFromShare(shareUrl: string, cloudType: string, sourceTitle?
       durationMs, driverResult.success ? 'success' : 'failed',
       driverResult.success ? null : driverResult.message,
       driverResult.folderName || null, driverResult.originalFolderName || null,
-      ipAddress || null, ipLocation, localTimestamp(),
+      ipAddress || null, ipLocation, localTimestamp(), config.id
     );
 
     return {
@@ -221,9 +221,9 @@ async function doSaveFromShare(shareUrl: string, cloudType: string, sourceTitle?
     ).run(config.id);
 
     db.prepare(
-      `INSERT INTO save_records (source_type, source_url, target_cloud, duration_ms, status, error_message, ip_address, ip_location, created_at)
+      `INSERT INTO save_records (source_type, source_url, target_cloud, duration_ms, status, error_message, ip_address, ip_location, created_at, config_id)
        VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)`
-    ).run(cloudType, shareUrl, cloudType, durationMs, 'failed', errorMessage, ipAddress || null, ipLocation, localTimestamp());
+    ).run(cloudType, shareUrl, cloudType, durationMs, 'failed', errorMessage, ipAddress || null, ipLocation, localTimestamp(), null);
 
     return { success: false, message: errorMessage };
   }
diff --git a/packages/backend/src/cloud/credential.service.ts b/packages/backend/src/cloud/credential.service.ts
index 17b8faf..bdfa923 100644
--- a/packages/backend/src/cloud/credential.service.ts
+++ b/packages/backend/src/cloud/credential.service.ts
@@ -423,11 +423,38 @@ export interface CredentialValidationResult {
  * 
  * Reference: search-ucmao get_and_validate_credential() pattern.
  */
-export async function getAndValidateCredential(cloudType: string, ipAddress?: string): Promise<CredentialValidationResult> {
+export async function getAndValidateCredential(cloudType: string, ipAddress?: string, shareUrl?: string): Promise<CredentialValidationResult> {
   const db = getDb();
 
   let config: CloudConfig | undefined;
 
+  // ── Resource history lookup: if this share URL was saved before, reuse that account ──
+  if (shareUrl) {
+    const historyRecord = db.prepare(
+      `SELECT config_id, target_cloud, folder_name FROM save_records
+       WHERE share_url = ? AND target_cloud = ? AND status IN ('success', 'reused')
+       ORDER BY id DESC LIMIT 1`
+    ).get(shareUrl, cloudType) as { config_id: number; target_cloud: string; folder_name: string } | undefined;
+
+    if (historyRecord) {
+      // Resource was previously saved — reuse the exact same config if still healthy
+      if (historyRecord.config_id) {
+        config = db.prepare(
+          `SELECT * FROM cloud_configs WHERE id = ? AND is_active = 1 AND consecutive_failures < 5`
+        ).get(historyRecord.config_id) as CloudConfig | undefined;
+      }
+      if (!config) {
+        // Fallback: pick any healthy account from this cloud type
+        config = db.prepare(
+          `SELECT * FROM cloud_configs
+           WHERE cloud_type = ? AND is_active = 1 AND consecutive_failures < 5
+           ORDER BY is_primary DESC, last_used_at ASC NULLS FIRST
+           LIMIT 1`
+        ).get(cloudType) as CloudConfig | undefined;
+      }
+    }
+  }
+
   if (!ipAddress) {
     // No IP info — fallback to simple LUR
     config = db.prepare(
diff --git a/packages/backend/src/database/database.ts b/packages/backend/src/database/database.ts
index f07b500..29cace1 100755
--- a/packages/backend/src/database/database.ts
+++ b/packages/backend/src/database/database.ts
@@ -138,27 +138,6 @@ function runMigrations(db: Database.Database): void {
 }
 
 /** 迁移: 给已有 save_records 表补充新列 */
-function migrateSaveRecords(db: Database.Database): void {
-  const newCols: { col: string; def: string }[] = [
-    { col: 'share_pwd', def: 'TEXT' },
-    { col: 'file_count', def: 'INTEGER DEFAULT 0' },
-    { col: 'folder_count', def: 'INTEGER DEFAULT 0' },
-    { col: 'duration_ms', def: 'INTEGER DEFAULT 0' },
-    { col: 'status', def: "TEXT NOT NULL DEFAULT ''" },
-    { col: 'error_message', def: 'TEXT' },
-    { col: 'folder_name', def: 'TEXT' },
-    { col: 'request_url', def: 'TEXT' },
-    { col: 'ip_location', def: 'TEXT' },
-    { col: 'original_folder_name', def: 'TEXT' },
-  ];
-  for (const { col, def } of newCols) {
-    try {
-      db.exec(`ALTER TABLE save_records ADD COLUMN ${col} ${def}`);
-    } catch {
-      // Column already exists — ignore
-    }
-  }
-}
 
 /** 迁移: 给 content_cache 表加 douban_url 列 */
 function migrateContentCache(db: Database.Database): void {
@@ -263,6 +242,14 @@ function migrateCloudConfigs(db: Database.Database): void {
   }
 }
 
+/** 迁移: 给 save_records 表加 config_id 字段 */
+function migrateSaveRecords(db: any): void {
+  if (!db.prepare("SELECT sql FROM sqlite_master WHERE name='save_records' AND sql LIKE '%config_id%'").get()) {
+    db.exec("ALTER TABLE save_records ADD COLUMN config_id INTEGER DEFAULT NULL");
+    console.log('[DB] save_records migration: config_id column added');
+  }
+}
+
 function seedAdmin(db: Database.Database): void {
   const existing = db.prepare('SELECT id FROM admins WHERE username = ?').get(config.adminUsername);
   if (existing) return;