When the machine boots but the reply disappears

Mainbrella's engineering blog digs into the backend mechanics that make machine creation reliable when replies vanish. It explains how Durable Objects serialize admission to prevent oversubscription, how idempotency keys and reservation fences stop stale messages from resurrecting canceled work, and why durable records don't make process handles durable. The piece follows a single job from admission through execution, showing the trade-offs behind every retry and the hard deadlines that govern compute budgets.