Starting memory-efficient processing for date: 20250621 Memory limit: 2048M Phase 1: Sorting sightings by device... File Crossroads_combined_flat_20250621_00.json not found File Crossroads_combined_flat_20250621_01.json not found File Crossroads_combined_flat_20250621_02.json not found File Crossroads_combined_flat_20250621_03.json not found File Crossroads_combined_flat_20250621_04.json not found File Crossroads_combined_flat_20250621_05.json not found File Crossroads_combined_flat_20250621_06.json not found File Crossroads_combined_flat_20250621_07.json not found File Crossroads_combined_flat_20250621_08.json not found File Crossroads_combined_flat_20250621_09.json not found File Crossroads_combined_flat_20250621_10.json not found File Crossroads_combined_flat_20250621_11.json not found File Crossroads_combined_flat_20250621_12.json not found File Crossroads_combined_flat_20250621_13.json not found File Crossroads_combined_flat_20250621_14.json not found File Crossroads_combined_flat_20250621_15.json not found File Crossroads_combined_flat_20250621_16.json not found File Crossroads_combined_flat_20250621_17.json not found File Crossroads_combined_flat_20250621_18.json not found File Crossroads_combined_flat_20250621_19.json not found File Crossroads_combined_flat_20250621_20.json not found File Crossroads_combined_flat_20250621_21.json not found File Crossroads_combined_flat_20250621_22.json not found File Crossroads_combined_flat_20250621_23.json not found Phase 1 complete. Total records: 0 Memory usage: 2MB Phase 2: Processing device sessions... Phase 2 complete. Total sessions: 0 Session Types: Output saved to: /var/www/html/CrowdFlow/Crossroads/Crossroads_combineddwell_flat_20250621.json Final memory usage: 2MB