def main [
    user_config: string
    database_config: string
] {
    alias psql = ^psql --tuples-only --no-align

    if not ($user_config | path exists) {
        print $"($user_config) does not exist!"
        exit 1
    }
    if not ($database_config | path exists) {
        print $"($database_config) does not exist!"
        exit 1
    }

    let users = ($user_config | open)
    let databases = ($database_config | open)

    $users | debug
    $databases | debug

    $users | each {
        |user|
        let exists = ("SELECT 1 FROM pg_roles WHERE rolname=:'username';" | psql --variable username=$"($user.username)")
        $exists | debug
    }
}