Odds are you plan to have a laptop anyhow for the user interface. (?!) You're better off running TicketsCAD from your laptop. It's more reliable, easier to connect to, and simpler to troubleshoot in a crisis. You likely won't have a keyboard, monitor, or network connection for that Pi computer when the SSD card fails, because that's what Pi computers do when you need them most.
I also like Proxmox for hosting VMs for my home and volunteer entities/organizations when you don't want to dedicate your laptop to the app.
You might consider docker images as well. It's a decent IT skill to learn.
TicketsCAD NewUI v4.0+ will be released hopefully in the next 2 weeks.
Are you looking at the current publicly released versions? Or have you seen the recent YouTube videos?