Persisted cost/lot specification (embedded schema).

Storage-layer counterpart of Beancount.CostSpec. Embedded inside Beancount.Schemas.Posting via embeds_one/3; it has no table of its own.

Fields

• per_amount - per-unit cost as Decimal.t(), or nil.
• per_currency - currency for per_amount.
• total_amount - total cost for all units ({{...}}), or nil.
• total_currency - currency for total_amount.
• date - acquisition Date.t() used for lot matching, or nil.
• label - lot label string, or nil.
• merge - when true, matching lots are merged on deposit.

Example

%Beancount.Schemas.CostSpec{
  per_amount: Decimal.new("150"),
  per_currency: "USD",
  total_amount: nil,
  total_currency: nil,
  date: ~D[2026-01-02],
  label: "lot-a",
  merge: false
}