Using code instead of ID for pet management

[IntoRain]

I noticed there's a code generator already and pets do have codes. I was thinking if it was possible to use the already available codes to manage pets instead of the ID. I'm worried about the function generating repeated codes and issues, so I wanted to ask first if it's safe to use it? I can always compare all used codes in all tables (might be easier to just create a new one with all the used codes), but the thought of comparing a lot of entries each time an egg is created makes me sweat