Entities

Account balance

The ledger balance and the independent supporting balance for an account at a period end, with the source of the supporting figure.

Volume

Accounts × periods

Retention

Indefinite

Entity attributes7

Exact decimal arithmetic end to end — database column, ORM mapping, API serialisation and client. Floating point anywhere in the chain is disqualifying.
Exact decimal arithmetic end to end — database column, ORM mapping, API serialisation and client. Floating point anywhere in the chain is disqualifying.
supporting_source
Exact decimal arithmetic end to end — database column, ORM mapping, API serialisation and client. Floating point anywhere in the chain is disqualifying.
account_balance_id
account_id / period_id
loaded_at

Entity relationships2

Entity relationships1

Reconciliation

Capability entities2

Entity lifecycle

Not yet researched

Only the control-bearing entities were modelled for lifecycle. Defensible as a starting point, but it does leave the entity model uneven, and this is incompleteness rather than a finding.

Capability operations3