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The best solution is to use InnoDB and define a foreign key on users_addresses.
Alternatively, you can define your own Conventional Reflection. I don't think there's any documentation page and I can't help you on this because I use NotORM, not Nette Database.
Documentation on configuration mentions how to make NDB use your reflection (here and below here in ‘full example’) but I couldn't find any explanation how to actually build one. I guess you'll have to study the source code.