Function deactivate_account 

pub async fn deactivate_account(
    id: &str,
    database: Arc<Database>,
    notifier: impl Fn(&str) -> Option<Arc<NotifyDispatcher>>,
    client_ip: Option<String>,
) -> Result<Option<Account>, Error>

Deactivates an account, and queues account_deactivated through its profile’s dispatcher — notifier looks one up by profile name, None where this process has none — naming client_ip as whoever asked.

The same acme_proxy_protocol::acme::account::deactivate the account’s own request runs, so the notification goes out however the account was shut.