A good example of where INT might make sense could be a table of a relatively set size, where other tables with massively more data had a foreign key to it. No

A good example of where INT might make sense could be a table of a relatively set size, where other tables with massively more data had a foreign key to it. No chance of overflow, but as a BIGINT it would take a ton of space elsewhere. Even then though, it’s potentially not worth it.