The Customer. A UK operator of student accommodation with a large, seasonal paid-media budget spread across several advertising platforms. The Challenge. Spend and targeting were controlled inside each platform separately, with no single record of who had authorised a budget change, whether campaigns were running only where they were permitted to, or whether spend was tracking to what had been approved. Oversight depended on manual reconciliation after the fact. The Solution. Built a governed data layer over the advertising platforms: a central warehouse, a configuration file holding the approved budgets, permitted geographies and account standards, and a decision register recording every material change and its rationale. How They Used Claude. Claude runs on a schedule against the warehouse and the live platforms. It checks pacing against approved budgets, confirms targeting stays within permitted geographies, flags structural drift, writes the oversight report, and keeps the decision register current. The Results. Continuous rather than monthly oversight of spend. Pacing and targeting exceptions caught early instead of at month end. A complete, contemporaneous audit trail of budget and targeting decisions, and a marketing team freed from manual reconciliation.