Postgres variables & clean up

do
$$
    declare
        userId varchar(255) := '98584bc7-f06b-45cf-bfc3-d5224cf7b743';
    begin
        delete from "LoginAttempt" where "userId" = userId;
        delete from "LoginSuccess" where "userId" = userId;
        delete from "LoginFailed" where "userId" = userId;
        delete from "Provider" where "userId" = userId;
        delete from "User" where id = userId;
    end
$$