Database design - Foreign Key to unique attribute - mysql

Question

I would like to build user login database schema. Following up with the convention, related data has to be gathered in separate tables and for each table only one primary key has to be defined. Accordingly, I've braked data in login and user tables.
Since, I want to use email as an username for login, I defined it as Foreign-Key in login table referencing to email attribute in user table. Also, in login table i have defined login_id as Primary Key, which is a Foreign-Key referencing to user_id attribute in users table.
Please advice, am I doing the design correctly and what is the best practice and approach?
SET #OLD_UNIQUE_CHECKS=##UNIQUE_CHECKS, UNIQUE_CHECKS=0;
SET #OLD_FOREIGN_KEY_CHECKS=##FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0;
SET #OLD_SQL_MODE=##SQL_MODE, SQL_MODE='ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION';
-- -----------------------------------------------------
-- Schema Alsos
-- -----------------------------------------------------
-- -----------------------------------------------------
-- Schema Alsos
-- -----------------------------------------------------
CREATE SCHEMA IF NOT EXISTS `Alsos` ;
USE `Alsos` ;
-- -----------------------------------------------------
-- Table `Alsos`.`user`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `Alsos`.`user` (
`user_id` INT UNSIGNED NOT NULL AUTO_INCREMENT,
`first_name` VARCHAR(45) NULL,
`last_name` VARCHAR(45) NULL,
`DoB` DATE NULL,
`contact_number` VARCHAR(45) NULL,
`social_link` VARCHAR(45) NULL,
`user_email` VARCHAR(45) NOT NULL,
PRIMARY KEY (`user_id`),
UNIQUE INDEX `user_id_UNIQUE` (`user_id` ASC) VISIBLE,
UNIQUE INDEX `user_email_UNIQUE` (`user_email` ASC) VISIBLE)
ENGINE = InnoDB
-- -----------------------------------------------------
-- Table `Alsos`.`login`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `Alsos`.`login` (
`login_id` INT UNSIGNED NOT NULL AUTO_INCREMENT,
`username` VARCHAR(45) NOT NULL,
`passwordHash` CHAR(60) NOT NULL,
`passwordSalt` CHAR(12) NOT NULL,
`date_created` DATETIME NULL,
`last_seen` DATETIME NULL,
`active` TINYINT NULL DEFAULT 1,
UNIQUE INDEX `accounts_id_UNIQUE` (`login_id` ASC) VISIBLE,
UNIQUE INDEX `email_UNIQUE` (`username` ASC) VISIBLE,
PRIMARY KEY (`login_id`),
CONSTRAINT `fk_user_id`
FOREIGN KEY (`login_id`)
REFERENCES `Alsos`.`user` (`user_id`)
ON DELETE CASCADE
ON UPDATE CASCADE,
CONSTRAINT `fk_username`
FOREIGN KEY (`username`)
REFERENCES `Alsos`.`user` (`user_email`)
ON DELETE CASCADE
ON UPDATE CASCADE)
ENGINE = InnoDB
SET SQL_MODE=#OLD_SQL_MODE;
SET FOREIGN_KEY_CHECKS=#OLD_FOREIGN_KEY_CHECKS;
SET UNIQUE_CHECKS=#OLD_UNIQUE_CHECKS;