Event Sourcing Event Store #822
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The Event Store can be implemented in this Python module.
A basic in-memory event store along with example Invite features.
Starting to see what it looks like to represent domain concepts in the commands and events. Instead of using string for every value, use a domain concept to represent the value types.
This commit includes an example of a "Value Object" named EmailAddress. It represents a valid email address. Consumers of this object can expect that the object is valid according to the data it contains such that the consumer does not have to check if the email is valid. An implementation of a SQLAlchemy-backed Event Store was also added along with a unit test using a SQLite in-memory. The Invite flow spec and code has been updated to include the idea of an invite that is pending to be sent.
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