diff --git a/internal/alert/rules.go b/internal/alert/rules.go
index 3207d63..e55cfe7 100644
--- a/internal/alert/rules.go
+++ b/internal/alert/rules.go
@@ -68,6 +68,60 @@ func (e *Engine) raiseAndNotify(ctx context.Context, hostID, kind, severity, mes
 	})
 }
 
+// Acknowledge updates the alert row and fans out alert.acknowledged to
+// every enabled channel. Best-effort: store errors are logged but the
+// dispatch still fires only when the store update succeeds.
+func (e *Engine) Acknowledge(ctx context.Context, alertID, userID string, when time.Time) error {
+	if err := e.store.Acknowledge(ctx, alertID, userID, when); err != nil {
+		return err
+	}
+	a, lerr := e.store.GetAlert(ctx, alertID)
+	if lerr != nil || a == nil {
+		// Acknowledge already succeeded; dispatch is best-effort.
+		return nil //nolint:nilerr
+	}
+	p := alertPayload(ctx, e.store, notification.EventAcknowledged, a)
+	go e.hub.Dispatch(context.WithoutCancel(ctx), p)
+	return nil
+}
+
+// Resolve marks the alert resolved and fans out alert.resolved.
+func (e *Engine) Resolve(ctx context.Context, alertID string, when time.Time) error {
+	a, _ := e.store.GetAlert(ctx, alertID)
+	if err := e.store.Resolve(ctx, alertID, when); err != nil {
+		return err
+	}
+	if a == nil {
+		return nil
+	}
+	p := alertPayload(ctx, e.store, notification.EventResolved, a)
+	go e.hub.Dispatch(context.WithoutCancel(ctx), p)
+	return nil
+}
+
+// alertPayload builds a Payload from a stored Alert, looking up the host
+// name when HostID is set.
+func alertPayload(ctx context.Context, st *store.Store, ev notification.Event, a *store.Alert) notification.Payload {
+	hostID, hostName := "", ""
+	if a.HostID != nil {
+		hostID = *a.HostID
+		hostName = hostID
+		if h, err := st.GetHost(ctx, hostID); err == nil && h != nil {
+			hostName = h.Name
+		}
+	}
+	return notification.Payload{
+		Event:    ev,
+		AlertID:  a.ID,
+		Severity: a.Severity,
+		Kind:     a.Kind,
+		HostID:   hostID,
+		HostName: hostName,
+		Message:  a.Message,
+		RaisedAt: a.CreatedAt,
+	}
+}
+
 // resolveAndNotify clears every open (or acknowledged) alert for
 // (host_id, kind) via store.AutoResolve, then fires alert.resolved
 // for each row that was actually open. Best-effort — errors are
diff --git a/internal/server/http/ui_alerts.go b/internal/server/http/ui_alerts.go
index 1a736b3..06c82fb 100644
--- a/internal/server/http/ui_alerts.go
+++ b/internal/server/http/ui_alerts.go
@@ -119,7 +119,13 @@ func (s *Server) handleUIAlertAcknowledge(w stdhttp.ResponseWriter, r *stdhttp.R
 		stdhttp.Error(w, "missing id", stdhttp.StatusBadRequest)
 		return
 	}
-	if err := s.deps.Store.Acknowledge(r.Context(), id, u.ID, time.Now().UTC()); err != nil {
+	var err error
+	if s.deps.AlertEngine != nil {
+		err = s.deps.AlertEngine.Acknowledge(r.Context(), id, u.ID, time.Now().UTC())
+	} else {
+		err = s.deps.Store.Acknowledge(r.Context(), id, u.ID, time.Now().UTC())
+	}
+	if err != nil {
 		slog.Warn("ui alerts: ack", "err", err)
 	}
 	_ = s.deps.Store.AppendAudit(r.Context(), store.AuditEntry{
@@ -147,7 +153,13 @@ func (s *Server) handleUIAlertResolve(w stdhttp.ResponseWriter, r *stdhttp.Reque
 		stdhttp.Error(w, "missing id", stdhttp.StatusBadRequest)
 		return
 	}
-	if err := s.deps.Store.Resolve(r.Context(), id, time.Now().UTC()); err != nil {
+	var err error
+	if s.deps.AlertEngine != nil {
+		err = s.deps.AlertEngine.Resolve(r.Context(), id, time.Now().UTC())
+	} else {
+		err = s.deps.Store.Resolve(r.Context(), id, time.Now().UTC())
+	}
+	if err != nil {
 		slog.Warn("ui alerts: resolve", "err", err)
 	}
 	_ = s.deps.Store.AppendAudit(r.Context(), store.AuditEntry{