== Use-case 0001 - Login
'''Initiating actor:''' Guest

'''Other actors:''' None

'''Description:'''
A guest wants to access their personalized profile in the system. If the guest attempts to perform a restricted action, they must log in. The guest logs in by providing a username and password. The system verifies the credentials and if valid, starts an authenticated session.

'''Scenario:'''
 1. Guest goes to the login page.
 2. Guest enters their username and password credentials.
 3. System checks the database to verify if the credentials exist and if they are correct:
{{{
#!sql
SELECT 
    user_id, 
    username, 
    email, 
    first_name, 
    last_name 
FROM users 
WHERE username = 'owner_bojan' 
  AND password = '$2a$10$hashed_pw_bojan';
}}}
 4. The user logs in, the system determines their role (Owner, Sitter, or Admin), and redirects them to their dashboard.