For now, to keep it simple, all datatypes will be created as varchar and foreign keys as int, to declare any other column as int, need to write id keyword anywhere in name when defining syntax.
> For modern Postgres versions it's also recommended to use standard compliant identity columns rather than the proprietary serial "types"
https://stackblitz.com/edit/web-platform-hxc9oz?file=index.h...
https://www.youtube.com/watch?v=8hYtZ38wuz4