Use-case 0002 Implementation - Sign up

Initiating actor: Guest

Other actors: None

Description: A new guest wants to use the platform to find a sitter or offer services. They must register an account first. The system creates the main user record and links it to the specific role table (in this example Pet Owner) using a secure transaction.

Scenario:

1. Guest clicks on the "Sign up" button.

2. Guest fills out their personal details and selects the "I am a Pet Owner" role.
3. Guest submits the form.
4. System creates the new user account and links it to the Pet Owner subtype table:

   Hibernate: 
       select
           u1_0.user_id,
           case 
               when u1_1.user_id is not null 
                   then 1 
               when u1_2.user_id is not null 
                   then 2 
               when u1_0.user_id is not null 
                   then 0 
               end,
               u1_0.email,
               u1_0.first_name,
               u1_0.last_name,
               u1_0.password,
               u1_0.username,
               u1_2.user_id 
           from
               project.users u1_0 
           left join
               project.pet_owners u1_1 
                   on u1_0.user_id=u1_1.user_id 
           left join
               project.pet_sitters u1_2 
                   on u1_0.user_id=u1_2.user_id 
           where
               u1_0.username=?
   Hibernate: 
       insert 
       into
           project.users
           (email, first_name, last_name, password, username, user_id) 
       values
           (?, ?, ?, ?, ?, ?)
   Hibernate: 
       insert 
       into
           project.pet_owners
           (user_id) 
       values
           (?)
   

5. System redirects the new user to the home page.