[BorderAmigos]

You're right, I was looking at the wrong file. Local vs. on the server. And there is one additional change...

$app->db->query($sql);

to

$this->query($sql);

So that part of datalogSave() contains

		if($diff_num > 0) {
			//print_r($diff_num);
			//print_r($diffrec_full);
			$diffstr = $this->quote(serialize($diffrec_full));
			$username = $this->quote($_SESSION["s"]["user"]["username"]);
			$dbidx = $primary_field.":".$primary_id;
						
			if($action == 'INSERT') $action = 'i';
			if($action == 'UPDATE') $action = 'u';
			if($action == 'DELETE') $action = 'd';
			$sql = "INSERT INTO sys_datalog (dbtable,dbidx,server_id,action,tstamp,user,data) VALUES ('".$db_table."','$dbidx','$server_id','$action','".time()."','$username','$diffstr')";
			$this->query($sql);
		}

With only the three
$app->db->
locations changed to
$this->
it appears to work now as far as putting the values in the database.

The mail filters do not show as active in ISPConfig 3 interface though, the 'active' column in the table is all 'y'.