Hello, Bitcointalk I have two questions and sorry if anwers already exist on some thread, but I haven't found it.

1. How to import private key to a wallet that created by seed. Sweep is unsituable if you want to use vanity address. I found the way is just create new separate wallet by importing keys.

2. Will addresses from "used" category be deleted ever by Electrum? I don't want to lose them.