diff --git a/internal/app/app.go b/internal/app/app.go
index 714c8b77..32a982e1 100644
--- a/internal/app/app.go
+++ b/internal/app/app.go
@@ -318,6 +318,7 @@ func New(cfg *config.Config, log *logger.Logger) (*App, error) {
 	}
 	monitorHandler := handler.NewMonitorHandler(mcpServer, executor, db, log.Logger)
 	monitorHandler.SetExternalMCPManager(externalMCPMgr) // 设置外部MCP管理器，以便获取外部MCP执行记录
+	notificationHandler := handler.NewNotificationHandler(db, agentHandler, log.Logger)
 	groupHandler := handler.NewGroupHandler(db, log.Logger)
 	authHandler := handler.NewAuthHandler(authManager, cfg, configPath, log.Logger)
 	attackChainHandler := handler.NewAttackChainHandler(db, &cfg.OpenAI, log.Logger)
@@ -434,6 +435,7 @@ func New(cfg *config.Config, log *logger.Logger) (*App, error) {
 		authHandler,
 		agentHandler,
 		monitorHandler,
+		notificationHandler,
 		conversationHandler,
 		robotHandler,
 		groupHandler,
@@ -600,6 +602,7 @@ func setupRoutes(
 	authHandler *handler.AuthHandler,
 	agentHandler *handler.AgentHandler,
 	monitorHandler *handler.MonitorHandler,
+	notificationHandler *handler.NotificationHandler,
 	conversationHandler *handler.ConversationHandler,
 	robotHandler *handler.RobotHandler,
 	groupHandler *handler.GroupHandler,
@@ -728,6 +731,8 @@ func setupRoutes(
 		protected.DELETE("/monitor/execution/:id", monitorHandler.DeleteExecution)
 		protected.DELETE("/monitor/executions", monitorHandler.DeleteExecutions)
 		protected.GET("/monitor/stats", monitorHandler.GetStats)
+		protected.GET("/notifications/summary", notificationHandler.GetSummary)
+		protected.POST("/notifications/read", notificationHandler.MarkRead)
 
 		// 配置管理
 		protected.GET("/config", configHandler.GetConfig)
diff --git a/internal/handler/hitl.go b/internal/handler/hitl.go
index f14681e6..70b3a27c 100644
--- a/internal/handler/hitl.go
+++ b/internal/handler/hitl.go
@@ -85,7 +85,7 @@ CREATE TABLE IF NOT EXISTS hitl_conversation_configs (
     enabled INTEGER NOT NULL DEFAULT 0,
     mode TEXT NOT NULL DEFAULT 'off',
     sensitive_tools TEXT NOT NULL DEFAULT '[]',
-    timeout_seconds INTEGER NOT NULL DEFAULT 300,
+    timeout_seconds INTEGER NOT NULL DEFAULT 0,
     updated_at DATETIME NOT NULL
 );`)
 	if err != nil {
@@ -133,7 +133,8 @@ func (m *HITLManager) ActivateConversation(conversationID string, req *HITLReque
 			tools[n] = struct{}{}
 		}
 	}
-	timeout := 5 * time.Minute
+	// timeout <= 0 means wait forever (no timeout).
+	timeout := time.Duration(0)
 	if req.TimeoutSeconds > 0 {
 		timeout = time.Duration(req.TimeoutSeconds) * time.Second
 	}
@@ -275,8 +276,8 @@ func (m *HITLManager) ensureConversationHITLModePersisted(conversationID, interr
 	}
 	cfg.Enabled = true
 	cfg.Mode = nm
-	if cfg.TimeoutSeconds <= 0 {
-		cfg.TimeoutSeconds = 300
+	if cfg.TimeoutSeconds < 0 {
+		cfg.TimeoutSeconds = 0
 	}
 	return m.SaveConversationConfig(conversationID, cfg)
 }
@@ -341,7 +342,7 @@ func (m *HITLManager) SaveConversationConfig(conversationID string, req *HITLReq
 		return errors.New("conversationId is required")
 	}
 	if req == nil {
-		req = &HITLRequest{Enabled: false, Mode: "off", TimeoutSeconds: 300}
+		req = &HITLRequest{Enabled: false, Mode: "off", TimeoutSeconds: 0}
 	}
 	mode := normalizeHitlMode(req.Mode)
 	if !req.Enabled {
@@ -349,8 +350,8 @@ func (m *HITLManager) SaveConversationConfig(conversationID string, req *HITLReq
 	}
 	tools, _ := json.Marshal(req.SensitiveTools)
 	timeout := req.TimeoutSeconds
-	if timeout <= 0 {
-		timeout = 300
+	if timeout < 0 {
+		timeout = 0
 	}
 	_, err := m.db.Exec(`INSERT INTO hitl_conversation_configs
 		(conversation_id, enabled, mode, sensitive_tools, timeout_seconds, updated_at)
@@ -368,11 +369,14 @@ func (m *HITLManager) LoadConversationConfig(conversationID string) (*HITLReques
 	err := m.db.QueryRow(`SELECT enabled, mode, sensitive_tools, timeout_seconds FROM hitl_conversation_configs WHERE conversation_id = ?`, conversationID).
 		Scan(&enabledInt, &mode, &toolsJSON, &timeout)
 	if errors.Is(err, sql.ErrNoRows) {
-		return &HITLRequest{Enabled: false, Mode: "off", SensitiveTools: []string{}, TimeoutSeconds: 300}, nil
+		return &HITLRequest{Enabled: false, Mode: "off", SensitiveTools: []string{}, TimeoutSeconds: 0}, nil
 	}
 	if err != nil {
 		return nil, err
 	}
+	if timeout < 0 {
+		timeout = 0
+	}
 	tools := make([]string, 0)
 	_ = json.Unmarshal([]byte(toolsJSON), &tools)
 	return &HITLRequest{
@@ -389,6 +393,12 @@ func (m *HITLManager) waitDecision(ctx context.Context, p *pendingInterrupt, tim
 		delete(m.pending, p.InterruptID)
 		m.mu.Unlock()
 	}()
+	var timeoutCh <-chan time.Time
+	if timeout > 0 {
+		timer := time.NewTimer(timeout)
+		defer timer.Stop()
+		timeoutCh = timer.C
+	}
 	select {
 	case d := <-p.decideCh:
 		// 只有 review_edit 模式允许改参；其他模式一律忽略 edited arguments
@@ -398,7 +408,7 @@ func (m *HITLManager) waitDecision(ctx context.Context, p *pendingInterrupt, tim
 		_, _ = m.db.Exec(`UPDATE hitl_interrupts SET status='decided', decision=?, decision_comment=?, decided_at=? WHERE id=?`,
 			d.Decision, d.Comment, time.Now(), p.InterruptID)
 		return d, nil
-	case <-time.After(timeout):
+	case <-timeoutCh:
 		_, _ = m.db.Exec(`UPDATE hitl_interrupts SET status='timeout', decision='approve', decision_comment='timeout auto approve', decided_at=? WHERE id=?`,
 			time.Now(), p.InterruptID)
 		return hitlDecision{Decision: "approve", Comment: "timeout auto approve"}, nil
@@ -718,8 +728,8 @@ func (h *AgentHandler) GetHITLConversationConfig(c *gin.Context) {
 			cfg2 := *cfg
 			cfg2.Enabled = true
 			cfg2.Mode = normalizeHitlMode(pendMode)
-			if cfg2.TimeoutSeconds <= 0 {
-				cfg2.TimeoutSeconds = 300
+			if cfg2.TimeoutSeconds < 0 {
+				cfg2.TimeoutSeconds = 0
 			}
 			cfg = &cfg2
 		}
diff --git a/internal/handler/notification.go b/internal/handler/notification.go
new file mode 100644
index 00000000..363af07d
--- /dev/null
+++ b/internal/handler/notification.go
@@ -0,0 +1,642 @@
+package handler
+
+import (
+	"fmt"
+	"net/http"
+	"sort"
+	"strconv"
+	"strings"
+	"time"
+
+	"cyberstrike-ai/internal/database"
+	"github.com/gin-gonic/gin"
+	"go.uber.org/zap"
+)
+
+// NotificationHandler 聚合通知（Phase 2：服务端统一计算）
+type NotificationHandler struct {
+	db           *database.DB
+	agentHandler *AgentHandler
+	logger       *zap.Logger
+}
+
+const notificationReadMaxRows = 150
+
+// NotificationSummaryItem 通知项
+type NotificationSummaryItem struct {
+	ID         string `json:"id"`
+	Level      string `json:"level"` // p0/p1/p2
+	Type       string `json:"type"`
+	Title      string `json:"title"`
+	Desc       string `json:"desc"`
+	Ts         string `json:"ts"` // RFC3339
+	Count      int    `json:"count,omitempty"`
+	Actionable bool   `json:"actionable"`
+	Read       bool   `json:"read"`
+	// 以下字段用于前端深链跳转（通知即入口）
+	ConversationID  string `json:"conversationId,omitempty"`
+	VulnerabilityID string `json:"vulnerabilityId,omitempty"`
+	ExecutionID     string `json:"executionId,omitempty"`
+	InterruptID     string `json:"interruptId,omitempty"`
+}
+
+// NotificationSummaryResponse 聚合响应
+type NotificationSummaryResponse struct {
+	SinceMs     int64                     `json:"sinceMs"`
+	GeneratedAt string                    `json:"generatedAt"`
+	P0Count     int                       `json:"p0Count"`
+	UnreadCount int                       `json:"unreadCount"`
+	Counts      map[string]int            `json:"counts"`
+	Items       []NotificationSummaryItem `json:"items"`
+}
+
+func NewNotificationHandler(db *database.DB, agentHandler *AgentHandler, logger *zap.Logger) *NotificationHandler {
+	return &NotificationHandler{
+		db:           db,
+		agentHandler: agentHandler,
+		logger:       logger,
+	}
+}
+
+func parseSinceMs(raw string) int64 {
+	v := strings.TrimSpace(raw)
+	if v == "" {
+		return 0
+	}
+	if ms, err := strconv.ParseInt(v, 10, 64); err == nil && ms > 0 {
+		return ms
+	}
+	if t, err := time.Parse(time.RFC3339, v); err == nil {
+		return t.UnixMilli()
+	}
+	return 0
+}
+
+func unixSecToRFC3339(sec int64) string {
+	if sec <= 0 {
+		return time.Now().UTC().Format(time.RFC3339)
+	}
+	return time.Unix(sec, 0).UTC().Format(time.RFC3339)
+}
+
+func normalizedSinceSec(sinceMs int64) int64 {
+	sec := sinceMs / 1000
+	// SQLite 默认时间精度到秒；给 1s 回看窗口，避免“同秒内新增”被漏算。
+	if sec > 0 {
+		return sec - 1
+	}
+	return 0
+}
+
+func normalizeSinceMs(raw int64) int64 {
+	if raw > 0 {
+		return raw
+	}
+	// 默认仅看最近 24 小时，避免首次打开拉全量历史噪音。
+	return time.Now().Add(-24 * time.Hour).UnixMilli()
+}
+
+func levelBySeverity(sev string) string {
+	switch strings.ToLower(strings.TrimSpace(sev)) {
+	case "critical", "high":
+		return "p0"
+	case "medium":
+		return "p1"
+	default:
+		return "p2"
+	}
+}
+
+func requestWantsEnglish(c *gin.Context) bool {
+	if c == nil {
+		return false
+	}
+	lang := strings.ToLower(strings.TrimSpace(c.Query("lang")))
+	if lang == "" {
+		lang = strings.ToLower(strings.TrimSpace(c.GetHeader("Accept-Language")))
+	}
+	return strings.HasPrefix(lang, "en")
+}
+
+func i18nText(english bool, zh string, en string) string {
+	if english {
+		return en
+	}
+	return zh
+}
+
+func (h *NotificationHandler) loadPendingHITLItems(limit int, english bool) ([]NotificationSummaryItem, error) {
+	rows, err := h.db.Query(`
+		SELECT
+			id,
+			conversation_id,
+			tool_name,
+			COALESCE(CAST(strftime('%s', created_at) AS INTEGER), 0)
+		FROM hitl_interrupts
+		WHERE status = 'pending'
+		ORDER BY created_at DESC
+		LIMIT ?
+	`, limit)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	items := make([]NotificationSummaryItem, 0, limit)
+	for rows.Next() {
+		var id, conversationID, toolName string
+		var createdSec int64
+		if err := rows.Scan(&id, &conversationID, &toolName, &createdSec); err != nil {
+			continue
+		}
+		desc := i18nText(english, "会话 "+conversationID+" 的审批中断待处理", "Conversation "+conversationID+" has pending HITL approval")
+		if strings.TrimSpace(toolName) != "" {
+			desc = i18nText(english, "工具 "+toolName+" 等待审批", "Tool "+toolName+" is waiting for approval")
+		}
+		items = append(items, NotificationSummaryItem{
+			ID:             "hitl:" + id,
+			Level:          "p0",
+			Type:           "hitl_pending",
+			Title:          i18nText(english, "HITL 待审批", "HITL Pending Approval"),
+			Desc:           desc,
+			Ts:             unixSecToRFC3339(createdSec),
+			Count:          1,
+			Actionable:     true,
+			Read:           false,
+			ConversationID: conversationID,
+			InterruptID:    id,
+		})
+	}
+	return items, nil
+}
+
+func (h *NotificationHandler) loadVulnerabilityItems(sinceMs int64, limit int, english bool) ([]NotificationSummaryItem, map[string]int, error) {
+	sinceSec := normalizedSinceSec(sinceMs)
+	rows, err := h.db.Query(`
+		SELECT
+			id,
+			title,
+			severity,
+			conversation_id,
+			COALESCE(CAST(strftime('%s', created_at) AS INTEGER), 0)
+		FROM vulnerabilities
+		WHERE CAST(strftime('%s', created_at) AS INTEGER) > ?
+		ORDER BY created_at DESC
+		LIMIT ?
+	`, sinceSec, limit)
+	if err != nil {
+		return nil, nil, err
+	}
+	defer rows.Close()
+	items := make([]NotificationSummaryItem, 0, limit)
+	counts := map[string]int{
+		"newCriticalVulns": 0,
+		"newHighVulns":     0,
+		"newMediumVulns":   0,
+		"newLowVulns":      0,
+		"newInfoVulns":     0,
+	}
+	for rows.Next() {
+		var id, title, severity, conversationID string
+		var createdSec int64
+		if err := rows.Scan(&id, &title, &severity, &conversationID, &createdSec); err != nil {
+			continue
+		}
+		switch strings.ToLower(strings.TrimSpace(severity)) {
+		case "critical":
+			counts["newCriticalVulns"]++
+		case "high":
+			counts["newHighVulns"]++
+		case "medium":
+			counts["newMediumVulns"]++
+		case "low":
+			counts["newLowVulns"]++
+		default:
+			counts["newInfoVulns"]++
+		}
+		sevUpper := strings.ToUpper(strings.TrimSpace(severity))
+		if sevUpper == "" {
+			sevUpper = "INFO"
+		}
+		finalTitle := i18nText(english, "新漏洞（"+sevUpper+"）", "New Vulnerability ("+sevUpper+")")
+		finalDesc := strings.TrimSpace(title)
+		if finalDesc == "" {
+			finalDesc = i18nText(english, "（无标题）", "(Untitled)")
+		}
+		items = append(items, NotificationSummaryItem{
+			ID:              "vuln:" + id,
+			Level:           levelBySeverity(severity),
+			Type:            "vulnerability_created",
+			Title:           finalTitle,
+			Desc:            finalDesc,
+			Ts:              unixSecToRFC3339(createdSec),
+			Count:           1,
+			Actionable:      false,
+			Read:            false,
+			ConversationID:  conversationID,
+			VulnerabilityID: id,
+		})
+	}
+	return items, counts, nil
+}
+
+func (h *NotificationHandler) loadFailedExecutionItems(sinceMs int64, limit int, english bool) ([]NotificationSummaryItem, int, error) {
+	sinceSec := normalizedSinceSec(sinceMs)
+	rows, err := h.db.Query(`
+		SELECT
+			id,
+			tool_name,
+			COALESCE(CAST(strftime('%s', start_time) AS INTEGER), 0)
+		FROM tool_executions
+		WHERE status = 'failed'
+		  AND CAST(strftime('%s', start_time) AS INTEGER) > ?
+		ORDER BY start_time DESC
+		LIMIT ?
+	`, sinceSec, limit)
+	if err != nil {
+		return nil, 0, err
+	}
+	defer rows.Close()
+	items := make([]NotificationSummaryItem, 0, limit)
+	count := 0
+	for rows.Next() {
+		var id, toolName string
+		var startSec int64
+		if err := rows.Scan(&id, &toolName, &startSec); err != nil {
+			continue
+		}
+		count++
+		if strings.TrimSpace(toolName) == "" {
+			toolName = i18nText(english, "未知工具", "unknown")
+		}
+		items = append(items, NotificationSummaryItem{
+			ID:          "exec_failed:" + id,
+			Level:       "p0",
+			Type:        "task_failed",
+			Title:       i18nText(english, "任务执行失败", "Task Execution Failed"),
+			Desc:        i18nText(english, "工具 "+toolName+" 执行失败", "Tool "+toolName+" execution failed"),
+			Ts:          unixSecToRFC3339(startSec),
+			Count:       1,
+			Actionable:  false,
+			Read:        false,
+			ExecutionID: id,
+		})
+	}
+	return items, count, nil
+}
+
+func (h *NotificationHandler) summarizeLongRunningTasks(threshold time.Duration, english bool) ([]NotificationSummaryItem, int) {
+	if h.agentHandler == nil || h.agentHandler.tasks == nil {
+		return nil, 0
+	}
+	tasks := h.agentHandler.tasks.GetActiveTasks()
+	now := time.Now()
+	items := make([]NotificationSummaryItem, 0, len(tasks))
+	for _, t := range tasks {
+		if t == nil {
+			continue
+		}
+		if now.Sub(t.StartedAt) >= threshold {
+			items = append(items, NotificationSummaryItem{
+				ID:             "task_long:" + t.ConversationID,
+				Level:          "p1",
+				Type:           "long_running_tasks",
+				Title:          i18nText(english, "长时间运行任务", "Long Running Task"),
+				Desc:           i18nText(english, "会话 "+t.ConversationID+" 运行超过 15 分钟", "Conversation "+t.ConversationID+" has been running over 15 minutes"),
+				Ts:             t.StartedAt.UTC().Format(time.RFC3339),
+				Count:          1,
+				Actionable:     true,
+				Read:           false,
+				ConversationID: t.ConversationID,
+			})
+		}
+	}
+	return items, len(items)
+}
+
+func (h *NotificationHandler) summarizeCompletedTasksSince(sinceMs int64, limit int, english bool) ([]NotificationSummaryItem, int) {
+	if h.agentHandler == nil || h.agentHandler.tasks == nil {
+		return nil, 0
+	}
+	since := time.UnixMilli(sinceMs)
+	completed := h.agentHandler.tasks.GetCompletedTasks()
+	items := make([]NotificationSummaryItem, 0, limit)
+	for _, t := range completed {
+		if t == nil {
+			continue
+		}
+		if t.CompletedAt.After(since) {
+			items = append(items, NotificationSummaryItem{
+				ID:             "task_completed:" + t.ConversationID + ":" + strconv.FormatInt(t.CompletedAt.Unix(), 10),
+				Level:          "p2",
+				Type:           "task_completed",
+				Title:          i18nText(english, "任务完成", "Task Completed"),
+				Desc:           i18nText(english, "会话 "+t.ConversationID+" 已完成", "Conversation "+t.ConversationID+" completed"),
+				Ts:             t.CompletedAt.UTC().Format(time.RFC3339),
+				Count:          1,
+				Actionable:     false,
+				Read:           false,
+				ConversationID: t.ConversationID,
+			})
+			if len(items) >= limit {
+				break
+			}
+		}
+	}
+	return items, len(items)
+}
+
+func buildPlaceholders(n int) string {
+	if n <= 0 {
+		return ""
+	}
+	out := make([]string, 0, n)
+	for i := 0; i < n; i++ {
+		out = append(out, "?")
+	}
+	return strings.Join(out, ",")
+}
+
+func (h *NotificationHandler) readStatesByIDs(ids []string) (map[string]bool, error) {
+	result := make(map[string]bool, len(ids))
+	if len(ids) == 0 {
+		return result, nil
+	}
+	holders := buildPlaceholders(len(ids))
+	query := "SELECT event_id FROM notification_reads WHERE event_id IN (" + holders + ")"
+	args := make([]interface{}, 0, len(ids))
+	for _, id := range ids {
+		args = append(args, id)
+	}
+	rows, err := h.db.Query(query, args...)
+	if err != nil {
+		return result, err
+	}
+	defer rows.Close()
+	for rows.Next() {
+		var id string
+		if err := rows.Scan(&id); err != nil {
+			continue
+		}
+		result[id] = true
+	}
+	return result, nil
+}
+
+func (h *NotificationHandler) applyReadStates(items []NotificationSummaryItem) ([]NotificationSummaryItem, error) {
+	markableIDs := make([]string, 0, len(items))
+	for _, item := range items {
+		if item.Actionable {
+			continue
+		}
+		markableIDs = append(markableIDs, item.ID)
+	}
+	readMap, err := h.readStatesByIDs(markableIDs)
+	if err != nil {
+		return items, err
+	}
+	for i := range items {
+		if items[i].Actionable {
+			items[i].Read = false
+			continue
+		}
+		items[i].Read = readMap[items[i].ID]
+	}
+	return items, nil
+}
+
+func filterVisibleItems(items []NotificationSummaryItem) []NotificationSummaryItem {
+	out := make([]NotificationSummaryItem, 0, len(items))
+	for _, item := range items {
+		if item.Actionable || !item.Read {
+			out = append(out, item)
+		}
+	}
+	return out
+}
+
+func countP0(items []NotificationSummaryItem) int {
+	total := 0
+	for _, item := range items {
+		if item.Level == "p0" {
+			if item.Count > 0 {
+				total += item.Count
+			} else {
+				total++
+			}
+		}
+	}
+	return total
+}
+
+func countUnread(items []NotificationSummaryItem) int {
+	total := 0
+	for _, item := range items {
+		if item.Actionable || !item.Read {
+			if item.Count > 0 {
+				total += item.Count
+			} else {
+				total++
+			}
+		}
+	}
+	return total
+}
+
+func createNotificationReadTableIfNeeded(db *database.DB) error {
+	if db == nil {
+		return fmt.Errorf("db is nil")
+	}
+	_, err := db.Exec(`
+		CREATE TABLE IF NOT EXISTS notification_reads (
+			event_id TEXT PRIMARY KEY,
+			read_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP
+		);
+	`)
+	if err != nil {
+		return err
+	}
+	_, idxErr := db.Exec(`CREATE INDEX IF NOT EXISTS idx_notification_reads_read_at ON notification_reads(read_at DESC);`)
+	return idxErr
+}
+
+func pruneNotificationReads(db *database.DB, maxRows int) error {
+	if db == nil {
+		return fmt.Errorf("db is nil")
+	}
+	if maxRows <= 0 {
+		return nil
+	}
+	_, err := db.Exec(`
+		DELETE FROM notification_reads
+		WHERE event_id NOT IN (
+			SELECT event_id
+			FROM notification_reads
+			ORDER BY read_at DESC, rowid DESC
+			LIMIT ?
+		)
+	`, maxRows)
+	return err
+}
+
+type markReadRequest struct {
+	EventIDs []string `json:"eventIds"`
+}
+
+func normalizeMarkableEventID(id string) (string, bool) {
+	v := strings.TrimSpace(id)
+	if v == "" {
+		return "", false
+	}
+	// 仅允许“可读后隐藏”的信息类事件；Actionable 事件不参与 read 标记。
+	allowedPrefixes := []string{
+		"vuln:",
+		"exec_failed:",
+		"task_completed:",
+	}
+	for _, prefix := range allowedPrefixes {
+		if strings.HasPrefix(v, prefix) {
+			return v, true
+		}
+	}
+	return "", false
+}
+
+// MarkRead 按事件 ID 标记已读
+func (h *NotificationHandler) MarkRead(c *gin.Context) {
+	if err := createNotificationReadTableIfNeeded(h.db); err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to prepare notification read table"})
+		return
+	}
+	var req markReadRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid request body"})
+		return
+	}
+	if len(req.EventIDs) == 0 {
+		c.JSON(http.StatusOK, gin.H{"ok": true, "marked": 0})
+		return
+	}
+	tx, err := h.db.Begin()
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to begin transaction"})
+		return
+	}
+	defer func() {
+		_ = tx.Rollback()
+	}()
+	stmt, err := tx.Prepare(`
+		INSERT INTO notification_reads(event_id, read_at)
+		VALUES(?, CURRENT_TIMESTAMP)
+		ON CONFLICT(event_id) DO UPDATE SET read_at = CURRENT_TIMESTAMP
+	`)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to prepare statement"})
+		return
+	}
+	defer stmt.Close()
+	marked := 0
+	for _, raw := range req.EventIDs {
+		id, ok := normalizeMarkableEventID(raw)
+		if !ok {
+			continue
+		}
+		if _, err := stmt.Exec(id); err != nil {
+			c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to mark read"})
+			return
+		}
+		marked++
+	}
+	if err := tx.Commit(); err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to commit read marks"})
+		return
+	}
+	if err := pruneNotificationReads(h.db, notificationReadMaxRows); err != nil {
+		h.logger.Warn("裁剪通知已读记录失败", zap.Error(err))
+	}
+	c.JSON(http.StatusOK, gin.H{"ok": true, "marked": marked})
+}
+
+// GetSummary 返回通知聚合视图（用于头部铃铛）
+func (h *NotificationHandler) GetSummary(c *gin.Context) {
+	if h.db == nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "database unavailable"})
+		return
+	}
+
+	if err := createNotificationReadTableIfNeeded(h.db); err != nil {
+		h.logger.Warn("初始化通知已读表失败", zap.Error(err))
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to initialize notification read table"})
+		return
+	}
+
+	english := requestWantsEnglish(c)
+	sinceMs := normalizeSinceMs(parseSinceMs(c.Query("since")))
+	limit, _ := strconv.Atoi(strings.TrimSpace(c.DefaultQuery("limit", "50")))
+	if limit <= 0 {
+		limit = 50
+	}
+	if limit > 200 {
+		limit = 200
+	}
+
+	hitlItems, err := h.loadPendingHITLItems(limit, english)
+	if err != nil {
+		h.logger.Warn("加载 HITL 通知失败", zap.Error(err))
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to summarize hitl notifications"})
+		return
+	}
+
+	vulnItems, vulnCounts, err := h.loadVulnerabilityItems(sinceMs, limit, english)
+	if err != nil {
+		h.logger.Warn("加载漏洞通知失败", zap.Error(err))
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to summarize vulnerabilities"})
+		return
+	}
+
+	longRunningItems, longRunningCount := h.summarizeLongRunningTasks(15*time.Minute, english)
+	completedItems, completedCount := h.summarizeCompletedTasksSince(sinceMs, limit, english)
+
+	items := make([]NotificationSummaryItem, 0, len(hitlItems)+len(vulnItems)+len(longRunningItems)+len(completedItems))
+	items = append(items, hitlItems...)
+	items = append(items, vulnItems...)
+	items = append(items, longRunningItems...)
+	items = append(items, completedItems...)
+
+	items, err = h.applyReadStates(items)
+	if err != nil {
+		h.logger.Warn("加载通知已读状态失败", zap.Error(err))
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to load notification read states"})
+		return
+	}
+	items = filterVisibleItems(items)
+
+	sort.Slice(items, func(i, j int) bool {
+		ti, errI := time.Parse(time.RFC3339, items[i].Ts)
+		tj, errJ := time.Parse(time.RFC3339, items[j].Ts)
+		if errI != nil || errJ != nil {
+			return i < j
+		}
+		return ti.After(tj)
+	})
+
+	p0Count := countP0(items)
+	unreadCount := countUnread(items)
+	c.JSON(http.StatusOK, NotificationSummaryResponse{
+		SinceMs:     sinceMs,
+		GeneratedAt: time.Now().UTC().Format(time.RFC3339),
+		P0Count:     p0Count,
+		UnreadCount: unreadCount,
+		Counts: map[string]int{
+			"hitlPending":      len(hitlItems),
+			"newCriticalVulns": vulnCounts["newCriticalVulns"],
+			"newHighVulns":     vulnCounts["newHighVulns"],
+			"newMediumVulns":   vulnCounts["newMediumVulns"],
+			"newLowVulns":      vulnCounts["newLowVulns"],
+			"newInfoVulns":     vulnCounts["newInfoVulns"],
+			"failedExecutions": 0,
+			"longRunningTasks": longRunningCount,
+			"completedTasks":   completedCount,
+		},
+		Items: items,
+	})
+}