# Design

## Domain Model

Describe entities, value objects, and business rules.

## Application Flow

Describe commands, queries, and handlers.

## Interface Contract

Describe routes, messages, commands, request DTOs, response DTOs, and errors.

## Data Model

Describe tables, indexes, migrations, and retention concerns.

## UI / Platform Impact

Describe browser, mobile, desktop, CLI, deployment, or platform-shell impact.

## Observability

Describe logs, audit records, metrics, or traces.

## Alternatives Considered

1. Option.