Duplication of active effects scheduled in the future on a new power source

[selverob]

Let's assume a schedule configuration like this (with substitute effect names):

[schedule.battery]
A = "10m"
B = "10m"

[schedule.external]
A = "15m"

If external power gets connected after 10 minutes but before 15 minutes, effect A will not get deduplicated with the current implementation and its effector will receive a duplicated Execute message.