def with_help(help_msg):
    def getter(self):
        return help_msg
    
    def decorator(cls):
        setattr(cls, "help_msg", getter)
        return cls

    return decorator


def with_startup(startup):
    def new_startup(self, db):
        return startup(self, db)
    
    def decorator(cls):
        setattr(cls, "on_start", new_startup)
        return cls

    return decorator


def with_shutdown(shutdown):
    def new_shutdown(self, db):
        return shutdown(self, db)
    
    def decorator(cls):
        setattr(cls, "on_shutdown", new_shutdown)
        return cls

    return decorator