CREATE TABLE IF NOT EXISTS driver_tokens(
 id BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
 driver_id BIGINT UNSIGNED NOT NULL,
 token CHAR(64) NOT NULL UNIQUE,
 created_at DATETIME NOT NULL,
 FOREIGN KEY(driver_id) REFERENCES drivers(id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;