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GPUs are expensive and run one heavy job at a time, so round-robin routing stalls behind busy workers. Here is a busy-aware scheduler built from Redis leases and keyspace notifications.
A plain lock deadlocks forever when the holder dies. A lease expires. Here is how to build one with compare-and-swap acquisition and a heartbeat, and the failure modes that decide the design.
When a database forbids automatic write retries, every write must be idempotent on its own. A content-derived id makes that free. Here is the derivation and the one invariant that keeps it safe.