// Package domain contains pure domain models with no external dependencies.
// These types represent the core business concepts of the service.
package domain

import "errors"

// Domain errors - these are business-level errors that should be translated
// to appropriate HTTP status codes by the handler layer.
var (
	// ErrNotFound indicates a requested resource does not exist.
	ErrNotFound = errors.New("not found")

	// ErrInvalidPreferenceKey indicates an unknown preference key was provided.
	ErrInvalidPreferenceKey = errors.New("invalid preference key")

	// ErrInvalidPreferenceValue indicates a preference value failed validation.
	ErrInvalidPreferenceValue = errors.New("invalid preference value")
)