Use only parquet files for events

app/controllers/network_ranges_controller.rb

@@ -256,8 +256,8 @@ class NetworkRangesController < ApplicationController
 
   def calculate_traffic_stats(network_range)
     if network_range.persisted?
-      # Real network - use cached events_count for total requests (much more performant)
-      if network_range.events_count > 0
+      # Real network - check if network has events using DuckDB for performance
+      if network_range.has_events?
         # Use indexed network_range_id for much better performance instead of expensive CIDR operator
         # Include child network ranges to capture all traffic within this network block
         network_ids = [network_range.id] + network_range.child_ranges.pluck(:id)