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A reserve cell's dead-man is fed only by director polls through the load balancer. With SQL readiness the balancer drops the cell during a database outage, the polls get 503 failed_to_pick_backend, and the cell trips (staging drill 2026-10-11, c2 at 11:47:59Z). admitMode=reserve now needs readinessLocal=true in the object being written, already there or set in the same write, and a reserve cell refuses readinessLocal=false unless the same write flips it back to db.