兼容压缩旧版备份结果

兼容旧 result 缺少 symlinks 清单的历史格式
补充缺字段元数据压缩回归测试

scripts/check-database-backup-to-oss.mjs

@@ -371,9 +371,11 @@ async function assertDirectHistoryPublishesCatalogBeforeCleanup() {
   };
   const baseline = await runDirectFilesBackup({...common, mode: 'full', uploadManifestFn: harness.uploadManifestFn});
   const legacyResultFile = path.join(fixture.workDir, 'legacy-full-result.json');
+  const legacyCatalogWithoutSymlinks = {...baseline.catalog};
+  delete legacyCatalogWithoutSymlinks.symlinks;
   writeFileSync(legacyResultFile, `${JSON.stringify({
     ...baseline,
-    catalog: baseline.catalog,
+    catalog: legacyCatalogWithoutSymlinks,
   }, null, 2)}\n`);
   const plan = discoverHistoryPlan({dataDir: fixture.dataDir});
   let failure = null;
@@ -441,6 +443,7 @@ async function assertDirectHistoryPublishesCatalogBeforeCleanup() {
   assertEqual(diskResult.catalog.fileCount, success.fileCount, '紧凑 result 仍应保留文件计数。');
   const compactedLegacyResult = JSON.parse(readFileSync(legacyResultFile, 'utf8'));
   assertTrue(!Object.hasOwn(compactedLegacyResult.catalog, 'files'), '旧 result 中重复的 files 清单应在成功运行后压缩。');
+  assertEqual(compactedLegacyResult.catalog.symlinkCount, 0, '缺少 symlinks 的旧 result 应按零个符号链接兼容迁移。');
   assertTrue((success.metadataCleanup?.compactedResultCount ?? 0) >= 1, 'metadata 清理应报告已压缩旧 result。');
   const historyCatalogObjectKey = state.historyCatalogs[0].objectKey;
   harness.objects.delete(historyCatalogObjectKey);

scripts/database-backup-to-oss.mjs

@@ -1473,8 +1473,8 @@ function compactDirectFilesResult(result) {
       catalogObjectKey: catalog.catalogObjectKey,
       baselineCatalogId: catalog.baselineCatalogId,
       rootName: catalog.rootName,
-      fileCount: catalog.files.length,
-      symlinkCount: catalog.symlinks.length,
+      fileCount: Array.isArray(catalog.files) ? catalog.files.length : 0,
+      symlinkCount: Array.isArray(catalog.symlinks) ? catalog.symlinks.length : 0,
     },
   };
 }