Type alias Actor

Actor: {
    expectedCount?: number;
    id: string;
    name: string;
    roles?: string[];
}

Actors are either humans or policies invoking commands

id actor identifier
- for human actors, this is usually a primary key to the users table, extracted from JWT, etc
- for process managers, this is the secondary stream used to reduce the state
name actor name
- for human actors, could be the full name, email, etc ... for log auditing purposes
- for process managers, the factory name
roles? array of role names used for authorization invariants (usually extracted from JWT and used by validation middleware)
expectedCount? expected count of actor events when process managers are enforcing transaction integrity