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Quick Summary
Implement a work queue that manages task lifecycles including reservation, completion, failure, and dead-letter routing.
Handle lease-based timeouts where unacknowledged tasks automatically transition to retry or dead-letter states.
Maintain strict ordering and attempt limits while processing logical time advancements.
What This Tests
State machine design and entity lifecycle management
Efficient timeout handling using priority queues
Event-sourced validation and consistency checks
Distributed systems concepts like leases and idempotency
Common Patterns
Heap / Priority Queue
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