In the code, it's considered something of a smell to use a bool at all. Look up "Boolean blindness". Basically instead of a bool field saying whether the pers

In the code, it's considered something of a smell to use a bool at all. Look up "Boolean blindness". Basically instead of a bool field saying whether the person wants the deluxe upgrade, you'd have an enum whose values are Regular | Deluxe. How you would represent that in a db would depend on how your implementation works.