UC-001 Create delegations — analysis realization

Overview	Requirements	Analysis	Design	Implementation	Tests
Use cases	Requirements	Analysis	Design	Implementation	Tests

Requirements: README

Participating classes

Class	Stereotype	Responsibility
Delegations page	boundary	Collects users, accounts, period and mode.
Delegation manager	control	Validates, applies limits and inserts in one transaction.
Permission policy	control	Checks the capability to create.
Notifier	control	Sends the messages after the transaction commits.
Delegation	entity	The stored record.

Collaboration

Notes

Skipping existing pairs and self-delegations is a rule of the manager, not of the screen. The notification is sent after the commit, so a failed message never undoes a delegation.