id

Represents a unique identifier for the implementing entity.

This identifier serves as the primary key for distinguishing between different instances of the same type. It is used extensively in:

• Database operations for record identification

• State management and event sourcing

• Caching mechanisms

• Equality and hashing operations

• API endpoints and resource references

The identifier must be:

• Unique across all instances of the implementing type

• Immutable once assigned

• Non-null and non-empty

• Suitable for use as a string key in maps and databases