feat: live update log in UI and suppress lifecycle Telegram during SAC update

Poll remote update_script.log while SSH update runs; skip lifecycle notify
when host agent_update_state is running (SAC v0.5.1).

backend/app/services/notify_dispatch.py

@@ -4,7 +4,7 @@ import logging
 
 from sqlalchemy.orm import Session
 
-from app.models import Event, Problem
+from app.models import Event, Host, Problem
 from app.services import email_notify, mobile_notify, telegram_notify, webhook_notify
 from app.services.notification_cooldown import should_notify_event, should_notify_problem
 from app.services.notification_policy import get_effective_notification_policy
@@ -111,8 +111,43 @@ def notify_daily_report(event: Event, *, db: Session | None = None) -> None:
     _dispatch_lifecycle_channels(event, db=db, policy=policy)
 
 
+def _host_sac_update_running(event: Event, db: Session | None) -> bool:
+    """Пока SAC выполняет agent-update на хосте — не слать lifecycle в Telegram."""
+    if db is None or not event.host_id:
+        return False
+    host = db.get(Host, event.host_id)
+    if host is None:
+        return False
+    if (host.agent_update_state or "").strip().lower() == "running":
+        logger.info(
+            "notify lifecycle skipped host update running host_id=%s event_id=%s",
+            host.id,
+            event.event_id,
+        )
+        return True
+    return False
+
+
+def _lifecycle_suppress_notifications(event: Event, *, db: Session | None = None) -> bool:
+    """Не слать TG при штатном SAC/cron update (lifecycle с trigger deploy_recycle)."""
+    if _host_sac_update_running(event, db):
+        return True
+    details = event.details if isinstance(event.details, dict) else {}
+    trigger = str(details.get("trigger") or "").strip().lower()
+    if trigger in ("deploy_recycle", "sac_update", "agent_update"):
+        logger.info(
+            "notify lifecycle skipped trigger=%s event_id=%s",
+            trigger,
+            event.event_id,
+        )
+        return True
+    return False
+
+
 def notify_lifecycle(event: Event, *, db: Session | None = None) -> None:
     """Старт/стоп/reload агента — всегда в каналы SAC (кроме TG, если telegram_via=agent)."""
+    if _lifecycle_suppress_notifications(event, db=db):
+        return
     if _skip_notifications_for_hidden_event(event, db):
         return
     policy = get_effective_notification_policy(db)