update_expense.puml

@startuml
actor user as "User"
boundary form as "ExpenseForm"
participant view as "FinancialView"
database db as "Database"

user -> form: Select expense to edit
form -> view: get_object(expense.id)
activate view
view -> db: Fetch expense data
activate db
db --> view: Expense details
deactivate db
view -> form: Display expense details
deactivate view

user -> form: Modify expense details
form -> view: form.is_valid()
activate view
view -> form: Data validation result
deactivate view

alt Valid Data
    form -> view: form.save()
    activate view
    view -> db: Update expense data
    activate db
    db --> view: Confirmation
    deactivate db
    view -> form: Success message
    deactivate view
else Invalid Data
    form -> form: Display validation error message
end

footer Sequence Diagram - Expense Update (Spend Less)

@enduml