# io8 System Architect Agent - Customized for This Project

## Project-Specific Instructions

## Architecture Document Update - 2025-09-24T10:58:00

This section details the system architecture for the `todoapp1` project, building upon the existing base project's architecture.

### System Overview Update
The `todoapp1` application will utilize a three-tier architecture: a frontend UI, a backend API, and a database. The frontend will be responsible for user interaction, the backend will handle business logic and data access, and the database will store persistent data.

### Architecture Pattern Update
Given the relative simplicity of the `todoapp1` application, a microservices architecture is not necessary.  A simpler RESTful API architecture will suffice for this project.

### Component Design Update
The frontend will consist of the following main components:

*   **TaskListComponent:** Displays the list of to-do items, allowing users to filter, sort, and view task details.
*   **TaskItemComponent:** Represents a single to-do item, allowing users to mark it as complete, edit it, or delete it.
*   **AddTaskComponent:** A form allowing users to create new to-do items.
*   **EditTaskComponent:** A form for modifying existing to-do items.

The backend API will include endpoints for:

*   `/tasks`: GET (retrieve all tasks), POST (add a new task), PUT (update a task), DELETE (delete a task).

### Data Architecture Update
The application will utilize a relational database (PostgreSQL, chosen for its scalability and ease of use). The database schema will include a table named `tasks` with the following columns:

*   `id` (SERIAL PRIMARY KEY)
*   `description` (TEXT NOT NULL)
*   `dueDate` (TIMESTAMP WITH TIME ZONE)
*   `completed` (BOOLEAN)

### API Design Update
The API will utilize standard RESTful principles.  All endpoints will return JSON data.  Error handling will be implemented to provide informative error messages to the client.

### Security Architecture Update
For the MVP, no user authentication will be implemented. This aspect may be revisited in later iterations. However, appropriate input sanitization and validation will be employed on the frontend to prevent common vulnerabilities like XSS.

### Scalability Considerations Update
The chosen architecture is scalable enough to handle a reasonable number of concurrent users.  The use of PostgreSQL and efficient database queries should ensure the application remains performant even with a growing number of tasks.  Load balancing could be explored in future iterations if significant scaling becomes necessary.


## Technology Stack Update - 2025-09-24T10:58:00

This section details the technology stack choices for the `todoapp1` project.

### Frontend Technologies Update
*   **Framework:** Angular
*   **Styling:** Angular Material (chosen for its material design and easy integration with Angular)
*   **State Management:**  Angular's built-in state management capabilities will be sufficient for the MVP.

### Backend Technologies Update
*   **Language:** Node.js with TypeScript (for better type safety and maintainability)
*   **Framework:** Express.js (a minimal and flexible Node.js framework)
*   **API:** RESTful API
*   **ORM:** TypeORM (an ORM that supports PostgreSQL and simplifies database interactions)

### Database Technologies Update
*   **Primary Database:** PostgreSQL

### Infrastructure Update
*   **Deployment:** Docker for containerization
*   **Hosting:** AWS (specifically, an Elastic Beanstalk instance for simple deployment and scaling)

### Development Tools Update
*   **Version Control:** Git
*   **Testing:** Jest, Cypress (for unit and integration testing)
*   **CI/CD:** GitHub Actions

## Base Agent Prompt Reference

This agent is based on the standard io8architect agent with project-specific customizations above.
Refer to the base io8architect agent prompt for general principles and workflow instructions.
