diff --git a/internal/service/api/handler/admin.go b/internal/service/api/handler/admin.go
index 455b76a..e969bfe 100644
--- a/internal/service/api/handler/admin.go
+++ b/internal/service/api/handler/admin.go
@@ -7,6 +7,7 @@ package handler
 
 import (
 	"context"
+	"crypto/subtle"
 	"net/http"
 	"strings"
 	"time"
@@ -19,8 +20,11 @@ func (h *Handler) AdminStats(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	// Constant-time сравнение токена: обычное != давало утечку по времени (ревью 2026-10-10).
 	authHeader := r.Header.Get("Authorization")
-	if !strings.HasPrefix(authHeader, "Bearer ") || strings.TrimPrefix(authHeader, "Bearer ") != h.Cfg.AdminStatsToken {
+	token := strings.TrimPrefix(authHeader, "Bearer ")
+	if !strings.HasPrefix(authHeader, "Bearer ") ||
+		subtle.ConstantTimeCompare([]byte(token), []byte(h.Cfg.AdminStatsToken)) != 1 {
 		writeJSON(w, http.StatusUnauthorized, errResp("unauthorized"))
 		return
 	}
diff --git a/internal/service/api/handler/mqtt_auth.go b/internal/service/api/handler/mqtt_auth.go
deleted file mode 100644
index 1288d11..0000000
--- a/internal/service/api/handler/mqtt_auth.go
+++ /dev/null
@@ -1,167 +0,0 @@
-// mqtt_auth.go — HTTP-auth и ACL для EMQX (MQTT CONNECT / pub-sub).
-//
-// Endpoints (без JWT, вызываются EMQX внутри платформы):
-//
-//	POST /internal/mqtt/auth — аутентификация: всегда HTTP 200, {"result":"allow"|"deny"}
-//	POST /internal/mqtt/acl  — авторизация pub/sub
-//
-// Источник устройств — таблица iot_devices (не k8s Secrets).
-package handler
-
-import (
-	"crypto/subtle"
-	"encoding/json"
-	"errors"
-	"net/http"
-	"strings"
-
-	"gitea.services.ngcloud.ru/Nail/IoT/internal/service/store"
-)
-
-// mqttAuthRequest — тело запроса от EMQX 5.x (username, password, clientid, peerhost).
-type mqttAuthRequest struct {
-	Username string `json:"username"`
-	Password string `json:"password"`
-	ClientID string `json:"clientid"`
-	PeerHost string `json:"peerhost"`
-}
-
-// mqttAuthResponse — ответ для EMQX (всегда HTTP 200).
-type mqttAuthResponse struct {
-	Result string    `json:"result"`
-	ACL    []aclRule `json:"acl,omitempty"`
-}
-
-// aclRule — правило ACL для EMQX HTTP auth.
-type aclRule struct {
-	Permission string `json:"permission"`
-	Action     string `json:"action"`
-	Topic      string `json:"topic"`
-}
-
-// mqttAclRequest — тело запроса ACL от EMQX.
-type mqttAclRequest struct {
-	Username string `json:"username"`
-	ClientID string `json:"clientid"`
-	Action   string `json:"action"`
-	Topic    string `json:"topic"`
-}
-
-// MQTTAuth — POST /internal/mqtt/auth.
-//
-// Логика:
-//  1. bridge-креды (MQTT_USERNAME/MQTT_PASSWORD из env) — проверяются до парсинга;
-//  2. username "{ns}_{deviceId}" → поиск устройства в iot_devices;
-//  3. constant-time сравнение пароля; проверка enabled;
-//  4. best-effort last_connected; ACL по топику устройства.
-func (h *Handler) MQTTAuth(w http.ResponseWriter, r *http.Request) {
-	var req mqttAuthRequest
-	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
-		writeJSON(w, http.StatusOK, mqttAuthResponse{Result: "deny"})
-		return
-	}
-
-	// Внутренний bridge-клиент: фиксированные креды, ACL выдаётся ниже.
-	if h.Cfg.MQTTUsername != "" && req.Username == h.Cfg.MQTTUsername {
-		if subtle.ConstantTimeCompare([]byte(h.Cfg.MQTTPassword), []byte(req.Password)) == 1 {
-			writeJSON(w, http.StatusOK, mqttAuthResponse{
-				Result: "allow",
-				ACL:    bridgeACLRules(),
-			})
-			return
-		}
-		writeJSON(w, http.StatusOK, mqttAuthResponse{Result: "deny"})
-		return
-	}
-
-	// Парсим username: "{namespace}_{deviceId}" (первый '_' — разделитель).
-	idx := strings.Index(req.Username, "_")
-	if idx <= 0 || idx == len(req.Username)-1 {
-		writeJSON(w, http.StatusOK, mqttAuthResponse{Result: "deny"})
-		return
-	}
-	ns := req.Username[:idx]
-	deviceID := req.Username[idx+1:]
-
-	device, err := h.Devices.GetByDeviceID(r.Context(), ns, deviceID)
-	if err != nil {
-		if !errors.Is(err, store.ErrNotFound) {
-			h.Log.Error("mqtt auth: device lookup", "namespace", ns, "device", deviceID, "err", err)
-		}
-		writeJSON(w, http.StatusOK, mqttAuthResponse{Result: "deny"})
-		return
-	}
-	if !device.Enabled {
-		writeJSON(w, http.StatusOK, mqttAuthResponse{Result: "deny"})
-		return
-	}
-	if subtle.ConstantTimeCompare([]byte(device.MQTTPassword), []byte(req.Password)) != 1 {
-		writeJSON(w, http.StatusOK, mqttAuthResponse{Result: "deny"})
-		return
-	}
-
-	// best-effort: обновляем время последнего подключения
-	h.Devices.TouchLastConnected(r.Context(), ns, deviceID)
-
-	writeJSON(w, http.StatusOK, mqttAuthResponse{
-		Result: "allow",
-		ACL:    deviceACLRules(ns, deviceID),
-	})
-}
-
-// MQTTAcl — POST /internal/mqtt/acl.
-//
-// Bridge (clientID из env MQTT_CLIENT_ID): только subscribe.
-// Устройство ({ns}_{deviceId}): pub/sub в своём топике.
-func (h *Handler) MQTTAcl(w http.ResponseWriter, r *http.Request) {
-	var req mqttAclRequest
-	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
-		writeJSON(w, http.StatusOK, mqttAuthResponse{Result: "deny"})
-		return
-	}
-
-	if req.ClientID == h.Cfg.MQTTClientID {
-		if req.Action == "subscribe" {
-			writeJSON(w, http.StatusOK, mqttAuthResponse{Result: "allow"})
-			return
-		}
-		writeJSON(w, http.StatusOK, mqttAuthResponse{Result: "deny"})
-		return
-	}
-
-	idx := strings.Index(req.Username, "_")
-	if idx <= 0 || idx == len(req.Username)-1 {
-		writeJSON(w, http.StatusOK, mqttAuthResponse{Result: "deny"})
-		return
-	}
-	ns := req.Username[:idx]
-	deviceID := req.Username[idx+1:]
-	deviceTopic := ns + "/telemetry/" + deviceID
-
-	switch {
-	case req.Action == "publish" && req.Topic == deviceTopic:
-		writeJSON(w, http.StatusOK, mqttAuthResponse{Result: "allow"})
-	case req.Action == "subscribe" && (req.Topic == deviceTopic || req.Topic == "#"):
-		writeJSON(w, http.StatusOK, mqttAuthResponse{Result: "allow"})
-	default:
-		writeJSON(w, http.StatusOK, mqttAuthResponse{Result: "deny"})
-	}
-}
-
-// bridgeACLRules — ACL для внутреннего bridge: subscribe на все telemetry-топики.
-func bridgeACLRules() []aclRule {
-	return []aclRule{
-		{Permission: "allow", Action: "subscribe", Topic: "+/telemetry/+"},
-		{Permission: "deny", Action: "all", Topic: "#"},
-	}
-}
-
-// deviceACLRules — ACL для устройства: только свой топик телеметрии.
-func deviceACLRules(ns, deviceID string) []aclRule {
-	topic := ns + "/telemetry/" + deviceID
-	return []aclRule{
-		{Permission: "allow", Action: "publish", Topic: topic},
-		{Permission: "allow", Action: "subscribe", Topic: topic},
-		{Permission: "deny", Action: "all", Topic: "#"},
-	}
-}