Implement Task Hierarchy: Project > Epic > Task > Subtask

[MadTinker]

Overview

Implement a hierarchical task structure to better organize work and provide clear parent-child relationships between tasks.

Hierarchy Structure

• Project (top level)
• Epic (major features/initiatives)
• Task (specific work items)
• Subtask (granular implementation steps)

Implementation Requirements

Database Schema

• Add parent_id field to tasks table
• Add task_type field (project, epic, task, subtask)
• Add hierarchy_level field for validation
• Create indexes for efficient hierarchy queries

API Endpoints

• GET /tasks/{id}/children - Get child tasks
• GET /tasks/{id}/ancestors - Get parent hierarchy
• POST /tasks/{id}/children - Create child task
• PUT /tasks/{id}/parent - Change parent relationship

Validation Logic

• Prevent circular dependencies
• Enforce hierarchy levels (subtask can't have epic parent)
• Validate maximum nesting depth
• Ensure parent exists before creating child

UI Components

• Tree view for task hierarchy
• Breadcrumb navigation
• Drag-and-drop for reorganization
• Collapsible/expandable hierarchy nodes

Acceptance Criteria

• Tasks can have parent-child relationships
• Hierarchy is enforced and validated
• UI displays hierarchy clearly
• API supports all hierarchy operations
• Migration script for existing data

Priority

High - Foundation for advanced task management features