Starting processing for date: 20250412
Warning: File ArtCar_combined_flat_20250412_17.json not found, skipping hour 17
Warning: File ArtCar_combined_flat_20250412_18.json not found, skipping hour 18
Warning: File ArtCar_combined_flat_20250412_19.json not found, skipping hour 19
Warning: File ArtCar_combined_flat_20250412_20.json not found, skipping hour 20
Total unique devices found before filtering: 0
Devices filtered out (< 10 min): 0
Filter rate: NAN%
Total devices after filtering: 0
Results saved to ArtCar_visitor_journeys_20250412.json
Device metrics saved to ArtCar_visitor_metrics_20250412.csv
Visitor segments saved to ArtCar_visitor_segments_20250412.csv
Location dwell time stats saved to ArtCar_location_dwell_20250412.csv

Processing complete. Summary:
- Total devices: 0
- Total visits: 0
- Avg span: 0 min
- Median span: 0 min
- Multi-location visitors: 0 (NAN%)
- Engaged visitors (15+ min): 0 + 0 = 0 (NAN%)

Location dwell time summary:
- AfterPartyStage: 0 visits, avg: 0 min, median: 0 min
- DowntownHoustonPlusTent: 0 visits, avg: 0 min, median: 0 min
- PrestonAndMilam: 0 visits, avg: 0 min, median: 0 min
- CongressAndMilam: 0 visits, avg: 0 min, median: 0 min
- All Locations: 0 visits, avg: 0 min, median: 0 min