First of all, yes, I think you're being too paranoid. You don't let end users run arbitrary code against these classes, do you? So who cares what they allow? In a persistent environment where database connections are kept open, multiple database logins can be a real problem because they tie up more resources.
As for how to do it, it's pretty simple. That whole base class setup is just a suggestion. You can either not have one at all and decide which database login to use in your class based on some config thing, or you could make Person a base class and then subclass it with MutablePerson and ImmutablePerson, moving the set_db call down to these subclasses.
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