Fix sync not updating arrival/departure dates on re-sync

ON CONFLICT clause was missing arrival_date, departure_date, nights, and
room_number — so early checkouts (where NewBook updates booking_departure
to the actual checkout date) never propagated to the DB columns. Reverts
the COUNT(DISTINCT) workaround since the root cause is now fixed.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/services/forecasting/pickup_v2_model.py

@@ -304,12 +304,9 @@ async def get_current_otb_rooms_by_category(db, stay_date: date) -> Dict[str, in
         return {}
 
     # Query actual bookings for real-time OTB count
-    # COUNT DISTINCT room_number so that multiple bookings on the same room
-    # (e.g. early-checkout Departed + new Arrived) count as one occupied room.
-    # COALESCE to newbook_id ensures unassigned rooms (no room_number) still count.
     result = await db.execute(
         text("""
-            SELECT category_id, COUNT(DISTINCT COALESCE(room_number, newbook_id)) as room_count
+            SELECT category_id, COUNT(*) as room_count
             FROM newbook_bookings_data
             WHERE arrival_date <= :stay_date
             AND departure_date > :stay_date