diff --git a/src/lib/weekly-report.ts b/src/lib/weekly-report.ts
index 90fc34d..23baad8 100644
--- a/src/lib/weekly-report.ts
+++ b/src/lib/weekly-report.ts
@@ -88,6 +88,7 @@ export async function collectWeeklyReportData(
       currentStatus: t.current_status,
       isResolved,
       steps,
+      availability: t.availability,
     }
   })
 
@@ -166,6 +167,60 @@ export async function collectWeeklyReportData(
   }
 }
 
+/** 从采集数据构建 metadata JSON */
+export function buildWeeklyMetadata(data: WeeklyReportData): string {
+  const faultTickets = [...data.gpuFaultTickets, ...data.storageFaultTickets]
+  const resolvedTickets = faultTickets.filter(t => t.isResolved)
+
+  const resolvedCount = resolvedTickets.length
+
+  const durations = resolvedTickets
+    .map(t => {
+      if (!t.closeTime) return 0
+      const assign = new Date(t.assignTime).getTime()
+      const close = new Date(t.closeTime).getTime()
+      return Math.round((close - assign) / 60000)
+    })
+    .filter(d => d > 0)
+  const avgDurationMinutes = durations.length > 0
+    ? Math.round(durations.reduce((s, d) => s + d, 0) / durations.length)
+    : 0
+
+  const ongoingCount = data.pendingCount
+
+  const faultTicketCount = data.totalFaultCount
+
+  const affectedDeviceIps = new Set(faultTickets.map(t => t.deviceIp))
+  const affectedDeviceCount = affectedDeviceIps.size
+
+  const availabilities = faultTickets
+    .map(t => t.availability)
+    .filter((a): a is number => a !== null && a !== undefined)
+  const avgAvailability = availabilities.length > 0
+    ? Math.round(availabilities.reduce((s, v) => s + v, 0) / availabilities.length * 10000) / 100
+    : 100
+
+  const reportLabel = `图灵IT基础设施运营周报（${data.weekLabel}）`
+
+  return JSON.stringify({
+    gpuCount: data.gpuTotal,
+    storageCount: data.storageTotal,
+    totalTickets: data.gpuFaultTickets.length + data.storageFaultTickets.length + data.otherTickets.length,
+    gpuFaultCount: data.gpuFaultTickets.length,
+    storageFaultCount: data.storageFaultTickets.length,
+    otherTicketCount: data.otherTickets.length,
+    avgAvailability,
+    resolvedCount,
+    avgDurationMinutes,
+    ongoingCount,
+    faultTicketCount,
+    affectedDeviceCount,
+    faultFreeDays: null,
+    availabilityDetails: null,
+    reportLabel,
+  })
+}
+
 /** 异步生成周报 */
 export async function generateWeeklyReport(reportId: number): Promise<void> {
   const db = getDb()
@@ -185,14 +240,7 @@ export async function generateWeeklyReport(reportId: number): Promise<void> {
     const filePath = path.join(REPORTS_DIR, fileName)
     fs.writeFileSync(filePath, buffer)
 
-    const metadata = JSON.stringify({
-      gpuCount: data.gpuTotal,
-      storageCount: data.storageTotal,
-      totalTickets: data.gpuFaultTickets.length + data.storageFaultTickets.length + data.otherTickets.length,
-      gpuFaultCount: data.gpuFaultTickets.length,
-      storageFaultCount: data.storageFaultTickets.length,
-      otherTicketCount: data.otherTickets.length,
-    })
+    const metadata = buildWeeklyMetadata(data)
 
     db.prepare(
       "UPDATE reports SET status = 'completed', file_path = ?, file_name = ?, metadata = ? WHERE id = ?"