sqlite db does not get written, and html shows blank page..

[jult]

2023/08/25 00:01:10 [error] 46404#46404: *1395 FastCGI sent in stderr: "PHP message: PHP Fatal error:  Uncaught Error: Undefined constant "start" in /var/www/mikrotik-traffic-status/traffic-aggregator.php:3
Stack trace:
#0 {main}
  thrown in /var/www/mikrotik-traffic-status/traffic-aggregator.php on line 3" while reading response header from upstream, client: 192.168.1.100, server: usage.local.site request: "GET /traffic-aggregator.php HTTP/1.1", upstream: "fastcgi://unix:/run/php/php8.2-fpm.sock:", host: "usage.local.site"

Have you ever tried the setup yourself? At least under debian 12, php8.2 it does not function.