Login Page Project

Project created to improve my programming skills.
This is a login page that has the following architecture:

How to set up your database as the application expects:

CREATE DATABASE golang_api;
USE golang_api;
CREATE TABLE users (
    id INT PRIMARY KEY AUTO_INCREMENT,
    username VARCHAR(50) NOT NULL UNIQUE,
    password VARCHAR(255) NOT NULL
);
CREATE TABLE sessions (
    cookie VARCHAR(255) PRIMARY KEY,
    user_id TEXT,
    expires_at DATETIME,
    created_at DATETIME DEFAULT CURRENT_TIMESTAMP
);

.env example:

DB_HOST=localhost
DB_USERNAME=root
DB_PASSWORD='root'
DB_DATABASE=golang_api
DB_PORT=3306
SECRET_KEY=Secret_key_to_encrypt_cookies