diff --git a/ssh-monitor b/ssh-monitor
index 11603cb..6f35814 100644
--- a/ssh-monitor
+++ b/ssh-monitor
@@ -7,7 +7,7 @@ IFS=$'\n\t'
 # ============================================
 
 CONFIG_FILE="/etc/ssh-monitor.conf"
-SSH_MONITOR_VERSION="2.0.5-SAC"
+SSH_MONITOR_VERSION="2.0.6-SAC"
 
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 if [ -f "$SCRIPT_DIR/sac-client.sh" ]; then
@@ -1968,7 +1968,7 @@ send_startup_notification() {
  message="${message}🚫 Автоблокировка IP: выключена (ENABLE_IP_BAN=0), только уведомления"$'\n'
  fi
  message="${message}⚪ Белый список: ${whitelist_count} IP/подсетей"$'\n'
- message="${message}❤️ Heartbeat будет отправляться каждые 12 часов"$'\n'
+ message="${message}❤️ Heartbeat будет отправляться каждые ${HEARTBEAT_INTERVAL_MINUTES} мин (SAC agent.heartbeat)"$'\n'
  message="${message}📢 Каналы уведомлений (все по списку): $(notify_chain_human)"
  message="$(message_ensure_server_line "$message")"
 
diff --git a/update_ssh_monitor.sh b/update_ssh_monitor.sh
index efb7e6e..d098d4a 100755
--- a/update_ssh_monitor.sh
+++ b/update_ssh_monitor.sh
@@ -170,24 +170,75 @@ set_config_kv() {
     fi
 }
 
+config_key_exists() {
+    local key="$1" file="$2"
+    grep -qE "^[[:space:]]*${key}=" "$file" 2>/dev/null
+}
+
+append_heartbeat_interval_block() {
+    local file="$1"
+    {
+        printf '\n# --- SAC agent.heartbeat (интервал в минутах; %s = 4 ч) ---\n' "$EXPECTED_HEARTBEAT_INTERVAL_MINUTES"
+        printf 'HEARTBEAT_INTERVAL_MINUTES="%s"\n' "$EXPECTED_HEARTBEAT_INTERVAL_MINUTES"
+        printf '# Порог watchdog: интервал + 1 ч запас (%s с)\n' "$EXPECTED_WATCHDOG_MAX_HEARTBEAT_AGE"
+        printf 'WATCHDOG_MAX_HEARTBEAT_AGE="%s"\n' "$EXPECTED_WATCHDOG_MAX_HEARTBEAT_AGE"
+    } >>"$file"
+}
+
 sync_heartbeat_interval_config() {
     local file="$CONFIG_FILE"
     local current_interval current_watchdog
+    local changed=0
+    local backed_up=0
 
     [ -f "$file" ] || return 1
 
-    current_interval=$(config_conf_value "HEARTBEAT_INTERVAL_MINUTES" "$file" 2>/dev/null || true)
-    current_watchdog=$(config_conf_value "WATCHDOG_MAX_HEARTBEAT_AGE" "$file" 2>/dev/null || true)
+    backup_config_once() {
+        if [ "$backed_up" -eq 0 ]; then
+            cp "$file" "${file}.bak.$(date +%Y%m%d_%H%M%S)" 2>/dev/null || true
+            backed_up=1
+        fi
+    }
 
-    if [ "$current_interval" = "$EXPECTED_HEARTBEAT_INTERVAL_MINUTES" ] \
-        && [ "$current_watchdog" = "$EXPECTED_WATCHDOG_MAX_HEARTBEAT_AGE" ]; then
+    if ! config_key_exists "HEARTBEAT_INTERVAL_MINUTES" "$file"; then
+        backup_config_once
+        if ! config_key_exists "WATCHDOG_MAX_HEARTBEAT_AGE" "$file"; then
+            append_heartbeat_interval_block "$file"
+            log_message "INFO" "Config $file: добавлены HEARTBEAT_INTERVAL_MINUTES=$EXPECTED_HEARTBEAT_INTERVAL_MINUTES и WATCHDOG_MAX_HEARTBEAT_AGE=$EXPECTED_WATCHDOG_MAX_HEARTBEAT_AGE (отсутствовали в конфиге)."
+        else
+            set_config_kv "HEARTBEAT_INTERVAL_MINUTES" "$EXPECTED_HEARTBEAT_INTERVAL_MINUTES" "$file"
+            log_message "INFO" "Config $file: добавлен HEARTBEAT_INTERVAL_MINUTES=$EXPECTED_HEARTBEAT_INTERVAL_MINUTES (отсутствовал в конфиге)."
+        fi
+        changed=1
+    else
+        current_interval=$(config_conf_value "HEARTBEAT_INTERVAL_MINUTES" "$file" 2>/dev/null || true)
+        if [ "$current_interval" != "$EXPECTED_HEARTBEAT_INTERVAL_MINUTES" ]; then
+            backup_config_once
+            set_config_kv "HEARTBEAT_INTERVAL_MINUTES" "$EXPECTED_HEARTBEAT_INTERVAL_MINUTES" "$file"
+            log_message "INFO" "Config $file: HEARTBEAT_INTERVAL_MINUTES ${current_interval:-?} → $EXPECTED_HEARTBEAT_INTERVAL_MINUTES (deploy policy)."
+            changed=1
+        fi
+    fi
+
+    if ! config_key_exists "WATCHDOG_MAX_HEARTBEAT_AGE" "$file"; then
+        backup_config_once
+        set_config_kv "WATCHDOG_MAX_HEARTBEAT_AGE" "$EXPECTED_WATCHDOG_MAX_HEARTBEAT_AGE" "$file"
+        log_message "INFO" "Config $file: добавлен WATCHDOG_MAX_HEARTBEAT_AGE=$EXPECTED_WATCHDOG_MAX_HEARTBEAT_AGE (отсутствовал в конфиге)."
+        changed=1
+    else
+        current_watchdog=$(config_conf_value "WATCHDOG_MAX_HEARTBEAT_AGE" "$file" 2>/dev/null || true)
+        if [ "$current_watchdog" != "$EXPECTED_WATCHDOG_MAX_HEARTBEAT_AGE" ]; then
+            backup_config_once
+            set_config_kv "WATCHDOG_MAX_HEARTBEAT_AGE" "$EXPECTED_WATCHDOG_MAX_HEARTBEAT_AGE" "$file"
+            log_message "INFO" "Config $file: WATCHDOG_MAX_HEARTBEAT_AGE ${current_watchdog:-?} → $EXPECTED_WATCHDOG_MAX_HEARTBEAT_AGE (deploy policy)."
+            changed=1
+        fi
+    fi
+
+    if [ "$changed" -eq 0 ]; then
         return 1
     fi
 
-    cp "$file" "${file}.bak.$(date +%Y%m%d_%H%M%S)" 2>/dev/null || true
-    set_config_kv "HEARTBEAT_INTERVAL_MINUTES" "$EXPECTED_HEARTBEAT_INTERVAL_MINUTES" "$file"
-    set_config_kv "WATCHDOG_MAX_HEARTBEAT_AGE" "$EXPECTED_WATCHDOG_MAX_HEARTBEAT_AGE" "$file"
-    log_message "INFO" "Config $file: HEARTBEAT_INTERVAL_MINUTES=$EXPECTED_HEARTBEAT_INTERVAL_MINUTES, WATCHDOG_MAX_HEARTBEAT_AGE=$EXPECTED_WATCHDOG_MAX_HEARTBEAT_AGE (deploy policy on script upgrade)."
     if [ "$DEPLOY_MODE" -eq 1 ]; then
         say_info "Heartbeat: ${EXPECTED_HEARTBEAT_INTERVAL_MINUTES} мин, watchdog ${EXPECTED_WATCHDOG_MAX_HEARTBEAT_AGE} с."
     fi
diff --git a/version.txt b/version.txt
index c030fe4..7f313be 100644
--- a/version.txt
+++ b/version.txt
@@ -1,2 +1 @@
-2.0.5-SAC
-
+2.0.6-SAC