-- Migration 031: Add project task comments
-- Allows users to add notes and comments to project tasks

CREATE TABLE IF NOT EXISTS project_task_comments (
    id INT(10) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
    task_id INT(10) UNSIGNED NOT NULL,
    user_id INT(10) UNSIGNED NOT NULL,
    comment_text TEXT NOT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    
    FOREIGN KEY (task_id) REFERENCES project_tasks(id) ON DELETE CASCADE,
    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
    
    INDEX idx_task_id (task_id),
    INDEX idx_user_id (user_id),
    INDEX idx_created_at (created_at)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;