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| # Feature Specification: Task CRUD Operations | |
| **Feature Branch**: `001-task-crud` | |
| **Created**: 2026-01-08 | |
| **Status**: Draft | |
| **Input**: User description: "Task CRUD Feature – Phase II Todo Web App" | |
| ## User Scenarios & Testing *(mandatory)* | |
| ### User Story 1 - View and Create Tasks (Priority: P1) | |
| As an authenticated user, I want to view my task list and create new tasks so that I can start managing my to-do items. | |
| **Why this priority**: This is the foundational MVP functionality. Without the ability to create and view tasks, the application has no value. This story delivers immediate user value and can be demonstrated independently. | |
| **Independent Test**: Can be fully tested by logging in, viewing an empty task list, creating a new task with a title, and seeing it appear in the list. Delivers core value of task creation and visibility. | |
| **Acceptance Scenarios**: | |
| 1. **Given** I am an authenticated user with no tasks, **When** I view my task list, **Then** I see an empty state message indicating no tasks exist | |
| 2. **Given** I am viewing my task list, **When** I click "Add Task" and enter a title "Buy groceries", **Then** the task appears in my list with the title and a default "not completed" status | |
| 3. **Given** I am creating a task, **When** I enter a title and optional description, **Then** both fields are saved and displayed in the task list | |
| 4. **Given** I am viewing my task list, **When** I refresh the page, **Then** all my previously created tasks are still visible (data persists) | |
| 5. **Given** I am an authenticated user, **When** I view my task list, **Then** I only see tasks that I created (not other users' tasks) | |
| --- | |
| ### User Story 2 - Update and Complete Tasks (Priority: P2) | |
| As an authenticated user, I want to edit my tasks and mark them as complete so that I can update task details and track my progress. | |
| **Why this priority**: After creating tasks, users need to update them as requirements change and mark them complete to track progress. This builds on P1 and adds essential task management capabilities. | |
| **Independent Test**: Can be tested by creating a task (from P1), editing its title or description, and toggling its completion status. Delivers progress tracking value. | |
| **Acceptance Scenarios**: | |
| 1. **Given** I have a task "Buy groceries", **When** I click edit and change the title to "Buy groceries and milk", **Then** the updated title is saved and displayed | |
| 2. **Given** I have a task with a description, **When** I edit the description, **Then** the updated description is saved | |
| 3. **Given** I have an incomplete task, **When** I click the checkbox to mark it complete, **Then** the task is visually marked as completed | |
| 4. **Given** I have a completed task, **When** I click the checkbox again, **Then** the task is marked as incomplete | |
| 5. **Given** I am editing a task, **When** I cancel the edit, **Then** the original task details remain unchanged | |
| --- | |
| ### User Story 3 - Delete Tasks (Priority: P3) | |
| As an authenticated user, I want to delete tasks I no longer need so that my task list stays clean and relevant. | |
| **Why this priority**: Task deletion is important for list maintenance but not critical for initial value delivery. Users can work around missing deletion by marking tasks complete. | |
| **Independent Test**: Can be tested by creating a task (from P1), deleting it, and verifying it no longer appears in the list. Delivers list management value. | |
| **Acceptance Scenarios**: | |
| 1. **Given** I have a task in my list, **When** I click the delete button, **Then** the task is removed from my list | |
| 2. **Given** I have deleted a task, **When** I refresh the page, **Then** the deleted task does not reappear | |
| 3. **Given** I am about to delete a task, **When** I am prompted for confirmation, **Then** I can confirm or cancel the deletion | |
| 4. **Given** I have multiple tasks, **When** I delete one task, **Then** only that specific task is removed and others remain | |
| --- | |
| ### User Story 4 - Filter and Sort Tasks (Priority: P4) | |
| As an authenticated user, I want to filter tasks by completion status and sort them so that I can focus on relevant tasks. | |
| **Why this priority**: Filtering and sorting improve usability but are not essential for core task management. Users can manually scan their list initially. | |
| **Independent Test**: Can be tested by creating multiple tasks with different completion statuses, applying filters (show all/active/completed), and verifying the correct subset is displayed. Delivers organization value. | |
| **Acceptance Scenarios**: | |
| 1. **Given** I have both completed and incomplete tasks, **When** I select "Active" filter, **Then** I only see incomplete tasks | |
| 2. **Given** I have both completed and incomplete tasks, **When** I select "Completed" filter, **Then** I only see completed tasks | |
| 3. **Given** I have multiple tasks, **When** I select "All" filter, **Then** I see all tasks regardless of completion status | |
| 4. **Given** I have multiple tasks, **When** I sort by creation date (newest first), **Then** tasks are displayed with most recent at the top | |
| 5. **Given** I have applied a filter, **When** I refresh the page, **Then** the filter preference is maintained | |
| --- | |
| ### Edge Cases | |
| - What happens when a user tries to create a task with an empty title? | |
| - What happens when a user tries to create a task with a title exceeding 200 characters? | |
| - What happens when a user tries to create a task with a description exceeding 1000 characters? | |
| - How does the system handle concurrent updates to the same task from multiple browser tabs? | |
| - What happens when the backend API is unavailable during task operations? | |
| - How does the system handle special characters or emojis in task titles and descriptions? | |
| - What happens when a user tries to access another user's task directly via URL manipulation? | |
| ## Requirements *(mandatory)* | |
| ### Functional Requirements | |
| - **FR-001**: System MUST allow authenticated users to create tasks with a title (1-200 characters, required) and description (0-1000 characters, optional) | |
| - **FR-002**: System MUST display all tasks belonging to the authenticated user in a list view | |
| - **FR-003**: System MUST allow users to edit the title and description of their existing tasks | |
| - **FR-004**: System MUST allow users to toggle the completion status of their tasks (completed/incomplete) | |
| - **FR-005**: System MUST allow users to delete their tasks with confirmation | |
| - **FR-006**: System MUST persist all task data to the database with automatic timestamps (created_at, updated_at) | |
| - **FR-007**: System MUST enforce data isolation - users can only view, edit, and delete their own tasks | |
| - **FR-008**: System MUST validate task title length (1-200 characters) and reject invalid submissions | |
| - **FR-009**: System MUST validate task description length (0-1000 characters) and reject invalid submissions | |
| - **FR-010**: System MUST provide filtering options: All tasks, Active tasks (incomplete), Completed tasks | |
| - **FR-011**: System MUST provide sorting options: by creation date (newest/oldest first) | |
| - **FR-012**: System MUST display task metadata: creation timestamp, last updated timestamp | |
| - **FR-013**: System MUST provide visual distinction between completed and incomplete tasks | |
| - **FR-014**: System MUST handle API errors gracefully with user-friendly error messages | |
| - **FR-015**: System MUST maintain responsive design across mobile, tablet, and desktop viewports | |
| ### Assumptions | |
| - Authentication and JWT token management are handled by a separate authentication feature (Spec 2) | |
| - The frontend receives a valid JWT token from the authentication system | |
| - The backend has middleware to verify JWT tokens and extract user identity | |
| - Database connection and configuration are already established | |
| - The user ID is available from the authenticated session/token | |
| ### Key Entities | |
| - **Task**: Represents a to-do item with the following attributes: | |
| - Unique identifier (system-generated) | |
| - Title (1-200 characters, required) | |
| - Description (0-1000 characters, optional) | |
| - Completion status (boolean: completed/incomplete) | |
| - Owner (reference to the user who created it) | |
| - Creation timestamp (automatically set) | |
| - Last updated timestamp (automatically updated) | |
| - Relationships: Belongs to one User | |
| - **User**: Represents an authenticated user (defined in authentication spec) | |
| - Unique identifier | |
| - Relationships: Has many Tasks | |
| ## Success Criteria *(mandatory)* | |
| ### Measurable Outcomes | |
| - **SC-001**: Users can create a new task in under 10 seconds from clicking "Add Task" to seeing it in their list | |
| - **SC-002**: Users can view their complete task list with all tasks loading and displaying within 2 seconds | |
| - **SC-003**: Users can edit a task and see the updated information reflected immediately (within 1 second of saving) | |
| - **SC-004**: Users can mark a task as complete and see the visual change instantly (within 500ms) | |
| - **SC-005**: Users can delete a task and see it removed from the list within 1 second | |
| - **SC-006**: System correctly isolates user data - 100% of API requests return only the authenticated user's tasks | |
| - **SC-007**: System handles 100 concurrent users performing task operations without errors or data corruption | |
| - **SC-008**: 95% of task operations (create, update, delete, complete) succeed on first attempt without errors | |
| - **SC-009**: Users can successfully complete all core task operations (create, view, update, complete, delete) on mobile devices with touch interactions | |
| - **SC-010**: System maintains data integrity - 100% of created tasks persist correctly and are retrievable after page refresh | |
| ### User Experience Outcomes | |
| - **SC-011**: Users can understand how to create, edit, and delete tasks without external documentation | |
| - **SC-012**: Error messages clearly communicate what went wrong and how to fix it (e.g., "Title must be between 1 and 200 characters") | |
| - **SC-013**: The interface provides immediate visual feedback for all user actions (loading states, success confirmations, error alerts) | |
| - **SC-014**: Users can distinguish between completed and incomplete tasks at a glance through clear visual indicators | |
| ## Out of Scope | |
| The following items are explicitly excluded from this specification: | |
| - User authentication and authorization implementation (covered in separate authentication spec) | |
| - JWT token generation, validation, and refresh logic (covered in authentication spec) | |
| - User registration and login flows (covered in authentication spec) | |
| - Task sharing or collaboration features | |
| - Task categories, tags, or labels | |
| - Task due dates or reminders | |
| - Task priority levels | |
| - Task attachments or file uploads | |
| - Task comments or notes beyond the description field | |
| - Task history or audit trail | |
| - Bulk operations (delete multiple tasks, mark multiple complete) | |
| - Task search functionality | |
| - Task export/import features | |
| - Chatbot or AI-powered task suggestions | |
| - Deployment configuration or environment setup | |
| - Advanced UI animations or transitions beyond standard interactions | |
| ## Dependencies | |
| - **Authentication System**: This feature requires a functioning authentication system that provides JWT tokens and user identity | |
| - **Database**: Requires Neon PostgreSQL database to be provisioned and accessible | |
| - **Backend Framework**: Requires FastAPI backend with SQLModel ORM configured | |
| - **Frontend Framework**: Requires Next.js 16+ with App Router configured | |
| ## Technical Constraints | |
| - **Frontend**: Must use Next.js 16+ (App Router), TypeScript, Tailwind CSS | |
| - **Backend**: Must use Python FastAPI with SQLModel ORM | |
| - **Database**: Must use Neon Serverless PostgreSQL | |
| - **API Design**: Must follow REST principles with JSON request/response format | |
| - **Authentication**: All task endpoints must require valid JWT token in Authorization header | |
| - **Code Generation**: All implementation must be generated via Claude Code referencing this specification | |
| - **File Structure**: Must follow monorepo organization with frontend/ and backend/ directories | |
| ## References | |
| This specification should be referenced during implementation planning and task generation: | |
| - `@specs/001-task-crud/spec.md` (this file) | |
| - `@specs/001-task-crud/plan.md` (to be created by `/sp.plan`) | |
| - `@specs/001-task-crud/tasks.md` (to be created by `/sp.tasks`) | |
| - `@specs/001-task-crud/contracts/` (API endpoint contracts to be defined in planning phase) | |