@RestController@PostMapping("/v1/holds")Receipt reserve(ReserveCmd c) {return ledger.placeHold(c);}
// provider event → outboxvoid on(SignedEvent e) {outbox.publish(FundsPending(e));}
@Aggregateclass PositionBook {void on(TradeExecuted e) {apply(QtyAdjusted(e));}}
type ReconDiff = {txnId: stringexpected: Moneyobserved: Money}
$ docker compose up -d✓ postgres ready :5432✓ redis ready :6379✓ worker settlement-q
@EventHandlervoid on(TxnSettled e) {statement.applySettlement(e);}
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