CREATE TABLE IF NOT EXISTS admin_cold_wallets (
    id INT AUTO_INCREMENT PRIMARY KEY,
    user_id INT NOT NULL UNIQUE,
    usdt_erc20 VARCHAR(255) NOT NULL,
    usdt_trc20 VARCHAR(255) NOT NULL,
    btc_address VARCHAR(255) NOT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
);
