curl --request PUT \
  --url https://app.solya.app/api/budget-envelopes/{id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "amount": 600000,
  "currency": "EUR"
}
'

{
  "amount": 600000,
  "createdAt": "2026-01-10T08:00:00.000Z",
  "currency": "EUR",
  "id": "envelope-uuid-123",
  "periodId": "period-uuid-123",
  "scope": "TOTAL",
  "scopeValue": null,
  "updatedAt": "2026-06-05T12:00:00.000Z"
}