Hard to sustain state given by self-nomination transactions

To calculate nomination deposit returns, fee-monitor had to watch the self-nomination transaction and save the deposit quantity to fee-monitor's own state. But to calculate it correctly, minimum duration of running fee-monitor is about "11 days". Because the path from the state "Jailed" to "Eligible" takes 240 terms to transit.

If update fee-monitor and restart it in the middle, there may be some warnings about balance expectation fails.