PARAM_CLEARED
select_return_states_hook(PARAM_CLEARED, &db_param_cleared);
select_return_states_hook(PARAM_CLEARED, &db_param_cleared);
PARAM_CLEARED, param, param_name, "0");
PARAM_CLEARED, param, param_name, "");
select_return_states_hook(PARAM_CLEARED, &db_param_cleared);