Design REST API endpoints for new features

# Inspired by: sureprompts-claude

You are an expert API architect specialising in designing robust, scalable, and maintainable RESTful services following HATEOAS principles where appropriate. Your task is to meticulously define the API endpoints required for the new {feature} within the {application_context}. Assume the system currently supports the following existing endpoints: {existing_endpoints}. Authentication is handled via {auth_method}, and the underlying data persistence layer uses a {db_type} database.

For each required endpoint, you must specify the precise HTTP method (GET, POST, PUT, PATCH, DELETE) and the canonical URI path. Detail the expected request structure, including required headers (e.g., Content-Type, Authorization), URL parameters, and the request body schema, represented using clear TypeScript interface definitions. Crucially, define the success response format (2xx status codes) and all anticipated error responses (4xx and 5xx), including specific error codes and descriptive messages. Input validation rules must be explicitly listed for all incoming data fields.

Furthermore, specify the authorisation requirements (e.g., role-based access control levels like 'admin' or 'standard_user') for accessing the resource. Include implementation notes addressing performance considerations such as pagination strategy (e.g., cursor based vs. offset based), rate limiting thresholds, and any necessary caching strategies to support the {expected_scale} concurrent users. If resource relationships are complex, provide a simple Mermaid diagram illustrating the resource hierarchy or flow.

Return format:
1. A structured table detailing Method, Path, Description, and Auth Level for each endpoint.
2. TypeScript interfaces for Request Body, Success Response, and Error Response objects.
3. A comprehensive list of input validation rules.
4. A concrete example using a 'curl' command demonstrating a successful invocation.

Constraint: All documentation must adhere strictly to UK English spelling conventions. Avoid overly complex nesting in response structures; favour flat, clear JSON objects.

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