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Object Oriented Design: Repositories and Inheritance

I have an OO design concern. Let's say my models as following: class Account {} class LocalAccount extends Account {} class SocialAccount extends Account {} These Account entities are persisted and ...
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How do you handle objects that need custom behavior, and need to exist as an entity in the database?

For a simple example, assume your application sends out notifications to users when various events happen. So in the database I might have the following tables: TABLE Event EventId ...