Интеллектуальная
операционная система

// Immutable Double-Entry Ledger Posting
func (s *LedgerService) PostEntry(ctx context.Context, req PostRequest) (*Entry, error) {
    tx, err := s.pool.BeginTx(ctx, pgx.TxOptions{IsoLevel: pgx.Serializable})
    if err != nil {
        return nil, fmt.Errorf("failed to open tx: %w", err)
    }
    defer tx.Rollback(ctx)

    // Verify cryptographic sequence hash
    lastHash, err := s.getLastHash(ctx, tx, req.AccountID)
    entryHash := crypto.ComputeSHA256(lastHash, req.Amount, req.Timestamp)

    // Stream outbox event to Apache Kafka
    outboxPayload := events.MarshalLedgerUpdate(entryHash, req.Amount)
    if err := s.outbox.Insert(ctx, tx, "ledger.events", outboxPayload); err != nil {
        return nil, err
    }

    return tx.Commit(ctx)
}