fix: 服务器数据纪元保护(空快照不清空本地,自动全量重推自救) / 详情页导出指定日 / 全局计时时钟面板

server/index.js

@@ -127,7 +127,10 @@ function saveRegistry() { writeJson(registryFile, registry); try { doBackup() }
 
 function userFile(userId) { return path.join(DATA_DIR, 'users', userId + '.json') }
 function loadUserData(userId) {
-  return readJson('users/' + userId + '.json', { userId, cursor: 0, tables: {}, tombstones: {} })
+  const data = readJson('users/' + userId + '.json', { userId, cursor: 0, tables: {}, tombstones: {} })
+  // 数据纪元：用户数据文件首次创建时间。目录被误删重建后该值改变，客户端据此识别并全量重推自救
+  if (!data.created_at) data.created_at = new Date().toISOString()
+  return data
 }
 function saveUserData(userId, data) {
   fs.mkdirSync(path.join(DATA_DIR, 'users'), { recursive: true })
@@ -442,7 +445,7 @@ async function handle(req, res) {
       const tombs = userData.tombstones[t] || {}
       for (const [u, deletedAt] of Object.entries(tombs)) outTombs.push({ table: t, uuid: u, deleted_at: deletedAt })
     }
-    json(res, 200, { tables: outTables, tombstones: outTombs, serverTime: new Date().toISOString() })
+    json(res, 200, { tables: outTables, tombstones: outTombs, serverTime: new Date().toISOString(), dataEpoch: String(userData.created_at || '') })
     return
   }