# Fictional support exercise answer key

Window: [2026-10-26T00:00:00+01:00, 2026-11-02T00:00:00+01:00). Snapshot fixed at the exclusive end.
12 source records; 12 unique TicketIDs; 11 new tickets (T001-T011); T012 created before the window.
10 distinct known issues among the 11 new tickets, because T001 and T002 share D01.
Created-cohort categories: Delivery 4/11 (36.4%); Billing 3/11 (27.3%); Access 2/11 (18.2%); Product information 1/11 (9.1%); Unclassified 1/11 (9.1%). Rounded shares total 100.1%.
New-cohort status at cutoff: 5 solved, 4 open, 2 pending.
Closing backlog in the complete fictional export: 7 unsolved tickets, including older T012.
Reopen events during the week: 2 (T003 and T009 each have 1). T003 is solved at cutoff.
No prior-week export, customer population denominator, message count, response-time log or CSAT data is supplied.
Do not infer product-wide failure rates, SLA performance, trend, agent quality or proven root cause.