Can't delete storage / network: xxx is currently in use

Hello,
I’m learning / trying to understand LXD containers, and i’m facing an annoying issue:
lxc list
is empty

but
lxc storage delete mypool
is not deletable, because used by 1

so i can’t delete and recreate a new storage.

Same for network interface lxdbr0.

How can i remove an asset when it is used by id 1 ?
What is this user id 1 ?

Thank you !

Answer: this is the default profile
lxc profile show default

and i can blank it with
printf ‘config: {}\ndevices: {}’ | lxc profile edit default

Once done, i can delete whatever.