Sequence Diagrams

1. User Authentication Processes

1.1 Register

sequenceDiagram
    actor U as User
    participant S as System
    participant DB as Database

    %register
    U->>S: register(username, email, password)
    S->>DB: Check if user exists
    DB-->>S: User does not exist
    S->>DB: Create new user
    DB-->>S: User created
    S->>U: Registration successful

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1.2 Login

sequenceDiagram
    actor U as User
    participant S as System
    participant DB as Database

    %login
    U->>S: login(username, password)
    S->>DB: Validate user credentials
    DB-->>S: Credentials valid
    S->>U: Login successful

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1.3 Logout

sequenceDiagram
    actor U as User
    participant S as System
    participant DB as Database

    %logout
    U->>S: logout()
    S->>DB: Update user session
    DB-->>S: Session updated
    S->>U: Logout successful

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