Base sql dump is in database.pgsql, then they got patches on top of that in /migrations
Afaik only one developer deploys this code to the webserver and last time I tried it wasnt reproducible https://www.vogons.org/viewtopic.php?p=1207261#p1207261 I suspect he is the only one who ever does build whole project, or maybe no one ever builds it from scratch. I think problem is in the database with codebase expecting never dump.
They claim to be looking for volunteers https://blog.theretroweb.com/2023/04/25/the-retro-web-is-loo... but I got no reply asking for help building.