NorskManager.setNodeIdleExpiry() method
Give ONE node its own grace period before the empty-node reaper terminates it, overriding the daemon-wide value. Pass 0 to clear the override and go back to the daemon-wide value.
The setting is daemon-owned and persisted: it survives a Manager restart, which is exactly when a node deliberately kept warm would otherwise be reaped.
Signature:
setNodeIdleExpiry(nodeId: NodeId, idleExpiryMs: number): Promise<void>;