style: apply ruff fixes

backend/routes/ask.py

@@ -46,7 +46,9 @@ def _extract_time_range(question: str) -> tuple[str | None, str | None]:
             start = now.replace(hour=0, minute=0, second=0, microsecond=0)
         else:
             num = int(m.group(1))
-            delta = {"days": timedelta(days=num), "hours": timedelta(hours=num), "minutes": timedelta(minutes=num)}[unit]
+            delta = {"days": timedelta(days=num), "hours": timedelta(hours=num), "minutes": timedelta(minutes=num)}[
+                unit
+            ]
             start = now - delta
         return start.isoformat().replace("+00:00", "Z"), now.isoformat().replace("+00:00", "Z")
 
@@ -238,11 +240,7 @@ async def ask_question(body: AskRequest, user: dict = Depends(require_auth)):
     query = _build_event_query(entity, start, end)
 
     try:
-        cursor = (
-            events_collection.find(query)
-            .sort([("timestamp", -1)])
-            .limit(LLM_MAX_EVENTS)
-        )
+        cursor = events_collection.find(query).sort([("timestamp", -1)]).limit(LLM_MAX_EVENTS)
         events = list(cursor)
     except Exception as exc:
         logger.error("Failed to query events for ask", error=str(exc))