How to clear bitcoind's peer list? (also containing peers in the past)
I didn't find an RPC command for it, is it stored in a file? Where?
You can stop bitcoind, and delete the peers.dat
file in the data directory. On next startup, bitcoind will start a new one, by seeding from DNS seeds and other means.
Why, though? Generally the peers database you have will be better quality than the new initial one you get.