Just tried deploying it and got a 502 and a Railway application error, tried looking a few hours later and the site was showing a 500 with a spam of errors in the output.

Interesting, thanks for flagging! I'm not exactly sure what the culprit is. I deployed it when I saw your message and I noticed that it wasnt doing anything, although when I came back it was working for me - it just took forever to load. I don't think this was the case when I created the template and oddly it doesnt seem like the image for this template has changed much since (no changes in the last 8 months) so this is very confusing..

What error messages did you get?

Yeah, was a little weird it took that long, but I got a 500 when opening the tab, an actual response from the application itself. I've attached a file of the deployment log.

Thank you, these logs are very helpful, I fixed that error now

Although, the long initialization time is still beyond me- from what I can gather it seems input's connection to MySQL closes unexpectedly which results in it having to reconnect but why it takes so long to do so makes no sense to me. Regardless, luckily seems to only be an issue with the initial migration so probably not a massive problem