Track successful sync runs

index.html

@@ -132,7 +132,6 @@
     </section>
 
     <section class="metrics" id="metrics" aria-label="数据概览" hidden>
-      <div class="metric"><span class="metric-label">数据更新时间</span><strong class="metric-value" id="updated-at">—</strong></div>
       <div class="metric"><span class="metric-label">记录数</span><strong class="metric-value" id="record-count">—</strong></div>
       <div class="metric"><span class="metric-label">LinkName 数</span><strong class="metric-value" id="link-count">—</strong></div>
       <div class="metric"><span class="metric-label">Total Commission</span><strong class="metric-value" id="total-commission">—</strong></div>
@@ -167,6 +166,7 @@
       'use strict';
 
       var DATA_URL = 'data/merged.html';
+      var SYNC_LOG_URL = 'data/sync-log.json';
       var RATES_URL = 'https://open.er-api.com/v6/latest/USD';
       var REQUIRED_FIELDS = ['Date', 'Commission', 'Order', 'GMV', 'Currency', 'LinkName'];
       var charts = [];
@@ -190,7 +190,6 @@
         rangeButtons: Array.from(document.querySelectorAll('[data-range]')),
         rateStatus: document.getElementById('rate-status'),
         metrics: document.getElementById('metrics'),
-        updatedAt: document.getElementById('updated-at'),
         recordCount: document.getElementById('record-count'),
         linkCount: document.getElementById('link-count'),
         totalCommission: document.getElementById('total-commission'),
@@ -205,7 +204,16 @@
         linkCommission: document.getElementById('link-commission-chart'),
         linkGmv: document.getElementById('link-gmv-chart')
       };
-      var state = { rawRecords: [], sourceCurrencies: [], selectedCurrency: '', latestDate: null, dateOnlyRows: 0, invalidCurrencyRows: 0 };
+      var state = {
+        rawRecords: [],
+        sourceCurrencies: [],
+        selectedCurrency: '',
+        latestDate: null,
+        dateOnlyRows: 0,
+        invalidCurrencyRows: 0,
+        syncLog: null,
+        syncLogUnavailable: false
+      };
 
       function setStatus(message, status) {
         elements.status.textContent = message;
@@ -277,6 +285,8 @@
 
       function updateNotice() {
         var messages = [];
+        if (state.syncLog) messages.push('最后成功运行：' + state.syncLog.displayTime);
+        if (state.syncLogUnavailable) messages.push('运行日志暂不可用。');
         if (state.dateOnlyRows) messages.push('已过滤 ' + formatNumber(state.dateOnlyRows) + ' 条只有 Date、Commission 和 GMV 均为空的日期行。');
         if (state.invalidCurrencyRows) messages.push('已排除 ' + formatNumber(state.invalidCurrencyRows) + ' 条币种为空、Unknown 或格式无效且包含金额的记录，请检查原始数据。');
         if (state.sourceCurrencies.length > 1) messages.push('检测到多个已知源币种（' + state.sourceCurrencies.join('、') + '），已统一换算为 USD，不能切换到 IDR。');
@@ -284,6 +294,15 @@
         elements.warning.hidden = messages.length === 0;
       }
 
+      function parseSyncLog(payload) {
+        if (!payload || typeof payload.last_success_at !== 'string' || !payload.last_success_at.trim() || Number.isNaN(Date.parse(payload.last_success_at))) {
+          throw new Error('运行日志缺少有效的 last_success_at。');
+        }
+        var shanghaiTime = typeof payload.last_success_at_shanghai === 'string' ? payload.last_success_at_shanghai.trim() : '';
+        var displayTime = shanghaiTime && !Number.isNaN(Date.parse(shanghaiTime)) ? shanghaiTime : payload.last_success_at;
+        return { displayTime: displayTime };
+      }
+
       function setRateStatus(message) { elements.rateStatus.textContent = message; }
 
       function updateCurrencyOptions() {
@@ -415,8 +434,7 @@
           return total + (record.gmv === null ? 0 : record.gmv);
         }, 0);
         elements.title.textContent = 'TTSHOP 销售看板 · ' + state.selectedCurrency;
-        elements.subtitle.textContent = 'Commission 与 GMV 趋势（当前加载时间：' + dateFormatter.format(new Date()) + '）';
-        elements.updatedAt.textContent = dateFormatter.format(new Date());
+        elements.subtitle.textContent = 'Commission 与 GMV 趋势（数据来自最近一次成功同步）';
         elements.recordCount.textContent = formatNumber(records.length);
         elements.linkCount.textContent = formatNumber(links.size);
         elements.totalCommission.textContent = state.selectedCurrency + ' ' + formatNumber(totalCommission);
@@ -551,11 +569,20 @@
       }
 
       function loadData() {
-        fetch(DATA_URL, { cache: 'no-store' }).then(function (response) {
+        var dataPromise = fetch(DATA_URL, { cache: 'no-store' }).then(function (response) {
           if (!response.ok) throw new Error('无法读取 data/merged.html（HTTP ' + response.status + '）。');
           return response.text();
-        }).then(function (htmlText) {
-          var result = readTable(htmlText);
+        });
+        var syncLogPromise = fetch(SYNC_LOG_URL, { cache: 'no-store' }).then(function (response) {
+          if (!response.ok) throw new Error('无法读取 data/sync-log.json（HTTP ' + response.status + '）。');
+          return response.json();
+        }).then(parseSyncLog).catch(function () {
+          state.syncLogUnavailable = true;
+          return null;
+        });
+        Promise.all([dataPromise, syncLogPromise]).then(function (results) {
+          var result = readTable(results[0]);
+          state.syncLog = results[1];
           state.rawRecords = result.records;
           state.dateOnlyRows = result.dateOnlyRows;
           state.invalidCurrencyRows = result.invalidCurrencyRows;