Chargeback & Forecast

Chargeback turns ledger rows into cost-center accountability. Forecasting turns the same rows into run-rate projections, overrun dates, and anomaly review queues.

flowchart TD L[Usage ledger] --> C[Cost centers] L --> F[Forecaster] L --> A[Anomaly detector] C --> R[Chargeback report] F --> B[Budget burn] A --> Q[Ack queue]

Allocation model

Cost-center CRUD is exposed under /cost-centers. Reports are exposed under /chargeback/report and include an unallocated bucket when rows do not carry a cost center.

Forecast model

The forecaster projects spend by period using observed spend and elapsed time. A simple run-rate equation is:

projected=current_spend×period_lengthelapsed_time projected = current\_spend \times {period\_length \over elapsed\_time}
Interpretation

Forecasts are operational signals, not invoices. Pair them with actual-cost cascade fields before sending executive chargeback numbers.

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