HARBOR HELPDESK — MODULE 02 / FICTIONAL EXPLORATION
Reuse the exact tickets.csv and dictionary from Applied Module 01. No source rows or values have changed. The new task is to explore, not to manufacture a cleaning story.
Manager question: did recorded service change after the routing start on 8 June 2026? Describe the extract; do not assume routing caused a difference. Entry visibility and staff rota also changed; no exposure/control/staff-hour records are supplied.
Cohorts [1 June 00:00, 8 June 00:00) and [8 June 00:00, 15 June 00:00), UTC; snapshot 22 June 2026 00:00. Four-hour first-human-response target is inclusive, using elapsed calendar hours. All 24 tickets mature for 72-hour first-resolution guardrail.
Create: source profile; duration summaries; three chart plans/one local chart; reconciled group comparison; missingness/explanation ledger; a 160–220 word evidence note and equal-weight extension.
The data is deliberately constructed, not representative business activity. Work locally; no account, upload, purchase or paid software is required.