fix: defer daily report push и увеличить pool БД (0.4.12)

FCM/каналы для report.daily.* после commit ingest (BackgroundTasks);
SAC_DB_POOL_SIZE=15, SAC_DB_MAX_OVERFLOW=25 для штурма 09:00.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/services/notify_dispatch.py

@@ -142,3 +142,20 @@ def notify_rdg_connection(event: Event, *, db: Session | None = None) -> None:
     if not should_notify_event(event, db):
         return
     _dispatch_lifecycle_channels(event, db=db, policy=policy)
+
+
+def schedule_notify_daily_report(event_db_id: int) -> None:
+    """Отложенное оповещение по суточному отчёту (после commit ingest, вне горячего POST)."""
+    from app.database import SessionLocal
+
+    db = SessionLocal()
+    try:
+        event = db.get(Event, event_db_id)
+        if event is None:
+            logger.warning("deferred daily report notify: event id=%s not found", event_db_id)
+            return
+        notify_daily_report(event, db=db)
+    except Exception:
+        logger.exception("deferred daily report notify failed event_db_id=%s", event_db_id)
+    finally:
+        db.close()