Model AggregatedDonationsAndTransfers

This model aggregates all donations and transfers per charity and year.

Purpose

Provides a summary of donated and transferred amounts for reporting and auditing.

Structure

Each entry is keyed by a tuple of (Year, Charity). For each key, the model tracks:

• Donated amounts per currency
• Transferred amounts per currency

Amounts are stored per currency using the MoneyBag type, which maps currency codes to amounts. Negative amounts are used to represent cancellations or reversals.

Relationships

• Used by: Calculator
• Related models: Donations2, Options
• Updated by donation and transfer events

Implementation Notes

• Aggregates data for annual reports and charity statements.
• Used for financial transparency and auditability.
• Updated when donations are made, cancelled, or transferred.