Custom fileds 'ts' type, update event

[lexxai]

I try extend custom fields by extend struct hook.
Database filed 'x_expire' is NULL by default value and have type: datatime;

function x_ext_mailbox($struct) {
 $struct['x_expire'] =  pacol(1, 1, 1, 'ts','x_expire','x_expiredate',0);
}
$CONF['mailbox_struct_hook']        = 'x_ext_mailbox';

How I can control update event, for replace entered empty or 0 value, to NULL record to database ?
For now if db filed have NULL value, used edit form show '0' in , and if i try update user data, have error of update database;

For search solution I added default value:
$struct['x_expire']['default'] = '2999-12-31';
But it fill at all users data 2999-12-31, instead of NULL.

And need write custom script that external connect to database and replace value 2999-12-31 to NULL
$CONF['mailbox_postedit_script'] = 'some_shell_script.sh';

How I can update result w/o use external postedit_script?

May be I can have some methods how redefine beforestore() in config.local.php ?

    public function store() {
        if ($this->values_valid == false) {
            $this->errormsg[] = "one or more values are invalid!";
            return false;
        }

        if ( !$this->beforestore() ) {
            return false;

[DavidGoodwin]

Perhaps https://github.com/postfixadmin/postfixadmin/blob/master/model/PFAHandler.php#L550 needs some special behaviour for 'ts' columns.

[DavidGoodwin]

your code here -

function x_ext_mailbox($struct) {
 $struct['x_expire'] =  pacol(1, 1, 1, 'ts','x_expire','x_expiredate',0);
}

should probably be passing $struct in as a reference - so perhaps becomes :

function x_ext_mailbox(&$struct) {
 $struct['x_expire'] =  pacol(1, 1, 1, 'ts','x_expire','x_expiredate',0);
}