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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)