A sales CRM modelled end to end: accounts and contacts, leads converted into an account, contact and deal, deals moving through stages with full stage history, activities, quotes, forecasts, territories and custom fields.
An ATS modelled end to end: jobs with openings and hiring teams, candidates separate from applications, per-job pipeline stages, interviews with panels, structured scorecards, offers with approval chains and a talent pool of near misses.
How an IT estate is tracked end to end: models versus serialised assets, custody history, software licences and seat allocation with compliance counts, warranties and support contracts, maintenance, depreciation, audits and disposal.
How an HR system models data that must never be overwritten: employees, positions and reporting lines as dated rows, compensation history, payroll runs and itemised payslips, tax withholding, time off as a ledger, and benefits enrolment.
An internal service desk modelled properly: a service catalogue, incidents and requests, ordered approval chains, change requests with risk and rollback plans, linked assets, versioned knowledge base articles, SLA clocks that pause, and satisfaction ratings.