-- Migration: Create ticket attachments table
-- Date: 2026-01-19
-- Description: Adds support for file attachments on tickets

CREATE TABLE IF NOT EXISTS ticket_attachments (
    attachment_id INT AUTO_INCREMENT PRIMARY KEY,
    ticket_id VARCHAR(9) NOT NULL,
    filename VARCHAR(255) NOT NULL,
    original_filename VARCHAR(255) NOT NULL,
    file_size INT NOT NULL,
    mime_type VARCHAR(100) NOT NULL,
    uploaded_by INT NULL,
    uploaded_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (ticket_id) REFERENCES tickets(ticket_id) ON DELETE CASCADE,
    FOREIGN KEY (uploaded_by) REFERENCES users(user_id) ON DELETE SET NULL,
    INDEX idx_attachments_ticket (ticket_id),
    INDEX idx_attachments_uploaded_by (uploaded_by)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;