feat: alarm page date filter, pagination, auto-cleanup

- 告警页增加日期范围筛选（默认今天），50 条/页分页
- AlarmCollector.GetFiltered 支持 from/to/limit/offset
- alarm_retention_days 配置项（默认 30 天），超期自动清理

cmd/managerd/main.go

@@ -74,6 +74,9 @@ func main() {
         log.Printf("load persisted tasks: %v", err)
     }
     alarmCollector := service.NewAlarmCollector(store.DB(), agentClient, regSvc)
+    if cfg.AlarmRetentionDays > 0 {
+        alarmCollector.SetRetention(cfg.AlarmRetentionDays)
+    }
     alarmCollector.Start()
     tplSvc := service.NewTemplateService(cfg)
     h := api.NewHandler(discoSvc, regSvc, agentClient, taskSvc, tplSvc)

internal/config/config.go

@@ -18,6 +18,7 @@ type Config struct {
     DBPath             string            `json:"db_path,omitempty"`
     LogDir             string            `json:"log_dir,omitempty"`
     MediaRepoPath      string            `json:"media_repo_path,omitempty"` // explicit import-only source; not used for runtime rendering
+    AlarmRetentionDays int               `json:"alarm_retention_days"`     // auto-delete alarms older than N days, 0=keep forever
     DeviceAliases      map[string]string `json:"device_aliases,omitempty"`
     path               string
 }

internal/service/alarm_collector.go

@@ -32,6 +32,7 @@ type AlarmCollector struct {
     registry      *RegistryService
     mu            sync.Mutex
     lastID        string // last alarm ID seen, to avoid duplicates
+    retentionDays int    // auto-delete alarms older than N days, 0=keep
 }
 
 func NewAlarmCollector(db *sql.DB, agent *AgentClient, registry *RegistryService) *AlarmCollector {
@@ -40,6 +41,32 @@ func NewAlarmCollector(db *sql.DB, agent *AgentClient, registry *RegistryService
 
 func (c *AlarmCollector) Start() {
     go c.poll()
+    go c.cleanupLoop()
+}
+
+// SetRetention configures alarm retention in days. 0 = keep forever.
+func (c *AlarmCollector) SetRetention(days int) {
+    c.retentionDays = days
+}
+
+func (c *AlarmCollector) cleanupLoop() {
+    c.cleanupOldAlarms()
+    ticker := time.NewTicker(24 * time.Hour)
+    defer ticker.Stop()
+    for range ticker.C {
+        c.cleanupOldAlarms()
+    }
+}
+
+func (c *AlarmCollector) cleanupOldAlarms() {
+    if c.db == nil || c.retentionDays <= 0 {
+        return
+    }
+    cutoff := time.Now().AddDate(0, 0, -c.retentionDays).Format(time.RFC3339)
+    _, err := c.db.Exec(`DELETE FROM alarm_records WHERE collected_at < ?`, cutoff)
+    if err != nil {
+        log.Printf("alarm cleanup: %v", err)
+    }
 }
 
 func (c *AlarmCollector) poll() {
@@ -183,6 +210,46 @@ ON CONFLICT(id) DO NOTHING
     }
 }
 
+// GetFiltered returns alarm records within a date range, with pagination.
+// Returns records and total count (ignoring limit/offset for count).
+func (c *AlarmCollector) GetFiltered(from, to string, limit, offset int) ([]AlarmRecord, int) {
+    if c.db == nil {
+        return nil, 0
+    }
+    fromTS := from + "T00:00:00"
+    toTS := to + "T23:59:59"
+
+    // Count total
+    var total int
+    c.db.QueryRow(`
+SELECT COUNT(*) FROM alarm_records
+WHERE timestamp >= ? AND timestamp <= ?
+`, fromTS, toTS).Scan(&total)
+
+    // Fetch page
+    rows, err := c.db.Query(`
+SELECT id, device_id, channel, timestamp, rule_name, rule_type, object_label, confidence, snapshot_url, clip_url, duration_ms, collected_at
+FROM alarm_records
+WHERE timestamp >= ? AND timestamp <= ?
+ORDER BY timestamp DESC
+LIMIT ? OFFSET ?
+`, fromTS, toTS, limit, offset)
+    if err != nil {
+        return nil, total
+    }
+    defer rows.Close()
+
+    var alarms []AlarmRecord
+    for rows.Next() {
+        var a AlarmRecord
+        if err := rows.Scan(&a.ID, &a.DeviceID, &a.Channel, &a.Timestamp, &a.RuleName, &a.RuleType, &a.ObjectLabel, &a.Confidence, &a.SnapshotURL, &a.ClipURL, &a.DurationMs, &a.CollectedAt); err != nil {
+            continue
+        }
+        alarms = append(alarms, a)
+    }
+    return alarms, total
+}
+
 // GetRecent returns the most recent N alarm records, newest first.
 func (c *AlarmCollector) GetRecent(limit int) []AlarmRecord {
     if c.db == nil || limit <= 0 {

internal/web/ui.go

@@ -83,6 +83,11 @@ type PageData struct {
     StandardResources        []storage.StandardResourceRecord
     ResourceStatusBoard      *service.ResourceStatusBoard
     AlarmRecords             []service.AlarmRecord
+    TotalAlarmCount          int
+    TotalAlarmPages          int
+    CurrentPage              int
+    SelectedFrom             string
+    SelectedTo               string
     TodayAlarmCount          int
     DeviceMetrics            []DeviceMetric
     ConsoleDevices           []ConsoleDeviceData
@@ -491,6 +496,9 @@ func NewUI(discovery *service.DiscoveryService, registry *service.RegistryServic
             }
             return v
         },
+        "add": func(a, b int) int {
+            return a + b
+        },
     }).ParseFS(uiFS, "ui/templates/*.html")
     if err != nil {
         return nil, err
@@ -1897,8 +1905,40 @@ func (u *UI) pageDiagnostics(w http.ResponseWriter, r *http.Request) {
 func (u *UI) pageAlarms(w http.ResponseWriter, r *http.Request) {
     u.ensureDevicesLoaded()
     data := PageData{Title: "告警中心", Devices: u.registry.GetDevices()}
+
+    // Parse date filter: ?date=2026-05-12 or ?from=...&to=... (default: today)
+    q := r.URL.Query()
+    today := time.Now().Format("2006-01-02")
+    from := strings.TrimSpace(q.Get("from"))
+    to := strings.TrimSpace(q.Get("to"))
+    date := strings.TrimSpace(q.Get("date"))
+    if date != "" {
+        from = date
+        to = date
+    }
+    if from == "" {
+        from = today
+    }
+    if to == "" {
+        to = today
+    }
+    // Parse page: ?page=N (default 1, 50 per page)
+    page := 1
+    if p, err := strconv.Atoi(q.Get("page")); err == nil && p > 0 {
+        page = p
+    }
+    perPage := 50
+
+    data.SelectedFrom = from
+    data.SelectedTo = to
+    data.CurrentPage = page
+
     if u.alarmCollector != nil {
-        data.AlarmRecords = u.alarmCollector.GetRecent(100)
+        data.AlarmRecords, data.TotalAlarmCount = u.alarmCollector.GetFiltered(from, to, perPage, (page-1)*perPage)
+    }
+    // Calculate total pages
+    if data.TotalAlarmCount > 0 {
+        data.TotalAlarmPages = (data.TotalAlarmCount + perPage - 1) / perPage
     }
     u.render(w, r, "alarms", data)
 }

internal/web/ui/templates/alarms.html

@@ -9,6 +9,14 @@
 </div>
 
 <div class="card">
+  <form method="get" action="/ui/alarms" style="display:flex;gap:8px;align-items:center;margin-bottom:12px;flex-wrap:wrap">
+    <input type="date" name="from" value="{{.SelectedFrom}}" style="width:150px;font-size:12px">
+    <span class="muted small">至</span>
+    <input type="date" name="to" value="{{.SelectedTo}}" style="width:150px;font-size:12px">
+    <button class="btn" style="font-size:12px;padding:4px 12px">筛选</button>
+    <a href="/ui/alarms" class="btn ghost" style="font-size:11px">今天</a>
+  </form>
+
   <div class="table-wrap">
     {{if .AlarmRecords}}
     <table>
@@ -28,14 +36,14 @@
         <tr>
           <td class="mono small">{{.Timestamp}}</td>
           <td>
-            <a href="/ui/devices/{{.DeviceID}}">{{.DeviceID}}</a>
+            <a href="/ui/devices/{{.DeviceID}}">{{shortID .DeviceID}}</a>
           </td>
           <td>{{.Channel}}</td>
           <td>
             <span class="pill warn">{{.RuleName}}</span>
           </td>
           <td>{{if .ObjectLabel}}{{.ObjectLabel}}{{else}}-{{end}}</td>
-          <td>{{if .Confidence}}{{.Confidence}}{{else}}-{{end}}</td>
+          <td>{{if .Confidence}}{{printf "%.2f" .Confidence}}{{else}}-{{end}}</td>
           <td>
             {{if .SnapshotURL}}
             <a href="{{.SnapshotURL}}" target="_blank" class="btn ghost">查看截图</a>
@@ -48,10 +56,20 @@
         {{end}}
       </tbody>
     </table>
+    {{if gt .TotalAlarmPages 1}}
+    <div style="margin-top:12px;display:flex;gap:6px;align-items:center">
+      <span class="muted small">{{.TotalAlarmCount}} 条记录，{{.TotalAlarmPages}} 页</span>
+      {{$from := $.SelectedFrom}}{{$to := $.SelectedTo}}
+      {{range $p := loop .TotalAlarmPages}}
+      {{$pn := add $p 1}}
+      <a href="/ui/alarms?from={{$from}}&to={{$to}}&page={{$pn}}" class="btn {{if eq $pn $.CurrentPage}}primary{{else}}ghost{{end}}" style="font-size:11px;padding:2px 8px">{{$pn}}</a>
+      {{end}}
+    </div>
+    {{end}}
     {{else}}
     <div class="empty-state">
       <div class="empty-title">暂无告警记录</div>
-      <div class="muted">设备尚未上报告警，或告警收集服务尚未启动。</div>
+      <div class="muted">所选日期范围内没有告警，或设备尚未上报。</div>
     </div>
     {{end}}
   </div>

managerd.json

@@ -10,5 +10,6 @@
   "log_dir": "data/logs",
   "device_aliases": {
     "d12a4719c91641df91b76ab271280797": "盒子A"
-  }
+  },
+  "alarm_retention_days": 30
 }