From the spec: https://jmap.io/spec-core.html#changes

When the state of the set of Foo records in an account changes on the server (whether due to creation, updates, or deletion), the state property of the Foo/get response will change.

We need to store all the changes made to mailbox objects in a table name EmailChangeRepository. First we will implement a memory version of it.

How

1. Define EmailChange model with these fields:

• accountId
• state
• created
• updated
• destroyed
• date

2. Implement APIs to interact with MemoryEmailChangeRepository (save, getFromState)

DoD

Write unit tests to show that MemoryEmailChangeRepository is functioning properly.