CREATE TABLE IF NOT EXISTS option_orders (
    id INT AUTO_INCREMENT PRIMARY KEY,
    user_id INT NOT NULL,
    symbol VARCHAR(20) NOT NULL,
    amount DECIMAL(18, 8) NOT NULL,
    direction ENUM('up', 'down') NOT NULL,
    duration INT NOT NULL, -- in seconds (60, 90, 120, 180, 300)
    profit_rate DECIMAL(5, 2) NOT NULL, -- e.g. 0.08 for 8%
    opening_price DECIMAL(18, 8) NOT NULL,
    closing_price DECIMAL(18, 8) DEFAULT NULL,
    status ENUM('pending', 'completed') DEFAULT 'pending',
    result ENUM('none', 'win', 'loss') DEFAULT 'none',
    profit DECIMAL(18, 8) DEFAULT 0,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    settle_at TIMESTAMP NULL
);