Add cancel RSVP feature (backend DELETE endpoint + frontend UI)

Allows guests to cancel their RSVP via a DELETE endpoint using their guestToken. Frontend shows cancel button in RsvpBar and clears local storage on success. Includes unit tests, integration tests, and E2E spec. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-03-12 17:45:37 +01:00
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+# Implementation Plan: Cancel RSVP
+
+**Branch**: `014-cancel-rsvp` | **Date**: 2026-03-09 | **Spec**: [spec.md](spec.md)
+**Input**: Feature specification from `/specs/014-cancel-rsvp/spec.md`
+
+## Summary
+
+Allow guests to cancel their RSVP either explicitly from the event detail view (tap-to-reveal pattern on the RSVP bar) or implicitly when removing an RSVP'd event from their event list. The backend provides an idempotent DELETE endpoint; the frontend handles confirmation, API call, localStorage cleanup, and UI state reset.
+
+## Technical Context
+
+**Language/Version**: Java 25 (backend), TypeScript 5.9 (frontend)
+**Primary Dependencies**: Spring Boot 3.5.x, Vue 3, Vue Router 5, openapi-fetch, openapi-typescript
+**Storage**: PostgreSQL (JPA via Spring Data, Liquibase migrations)
+**Testing**: JUnit + Mockito (backend unit), MockMvc + Testcontainers (backend integration), Vitest (frontend unit), Playwright + MSW (frontend E2E)
+**Target Platform**: Self-hosted PWA (web browser, mobile-first)
+**Project Type**: Web application (hexagonal backend + SPA frontend)
+**Performance Goals**: Cancel operation < 500ms server-side
+**Constraints**: Privacy by design (no analytics), token-based auth (no login), idempotent delete
+**Scale/Scope**: Single new endpoint, 3 modified frontend components, 1 new composable method
+
+## Constitution Check
+
+*GATE: Must pass before Phase 0 research. Re-check after Phase 1 design.*
+
+| Principle | Status | Notes |
+|-----------|--------|-------|
+| I. Privacy by Design | PASS | No new PII stored. Delete operation removes data. No analytics. |
+| II. Test-Driven Methodology | PASS | Plan includes TDD cycle: tests before implementation. E2E mandatory. |
+| III. API-First Development | PASS | OpenAPI spec updated first, types generated before implementation. |
+| IV. Simplicity & Quality | PASS | Minimal changes to existing code. No new abstractions. Idempotent delete is the simplest correct approach. |
+| V. Dependency Discipline | PASS | No new dependencies required. |
+| VI. Accessibility | PASS | Interactive elements will use semantic HTML, ARIA, keyboard navigation. Confirm dialog already accessible. |
+
+**Gate result**: ALL PASS — proceed to Phase 0.
+
+## Project Structure
+
+### Documentation (this feature)
+
+```text
+specs/014-cancel-rsvp/
+├── plan.md              # This file
+├── research.md          # Phase 0 output
+├── data-model.md        # Phase 1 output
+├── contracts/           # Phase 1 output
+│   └── cancel-rsvp.yaml # DELETE endpoint contract
+└── tasks.md             # Phase 2 output (by /speckit.tasks)
+```
+
+### Source Code (repository root)
+
+```text
+backend/
+├── src/main/java/de/fete/
+│   ├── domain/
+│   │   ├── model/Rsvp.java                          # existing (no changes)
+│   │   ├── model/RsvpToken.java                     # existing (no changes)
+│   │   └── port/
+│   │       ├── in/CancelRsvpUseCase.java            # NEW use case port
+│   │       └── out/RsvpRepository.java              # MODIFY (add deleteByRsvpToken)
+│   ├── application/service/RsvpService.java          # MODIFY (implement cancel)
+│   └── adapter/
+│       ├── in/web/EventController.java               # MODIFY (add DELETE handler)
+│       └── out/persistence/
+│           ├── RsvpJpaRepository.java                # MODIFY (add deleteByRsvpToken)
+│           └── RsvpPersistenceAdapter.java           # MODIFY (implement delete)
+├── src/main/resources/openapi/api.yaml               # MODIFY (add DELETE endpoint)
+└── src/test/java/de/fete/
+    ├── application/service/RsvpServiceTest.java      # MODIFY (add cancel tests)
+    └── adapter/in/web/EventControllerIntegrationTest.java  # MODIFY (add cancel tests)
+
+frontend/
+├── src/
+│   ├── api/schema.d.ts                               # REGENERATE (from updated OpenAPI)
+│   ├── components/
+│   │   ├── RsvpBar.vue                               # MODIFY (tap-to-reveal cancel)
+│   │   ├── EventList.vue                             # MODIFY (conditional dialog msg)
+│   │   └── ConfirmDialog.vue                         # existing (no changes)
+│   ├── composables/useEventStorage.ts                # MODIFY (add removeRsvp)
+│   └── views/EventDetailView.vue                     # MODIFY (add cancel logic)
+└── e2e/
+    └── cancel-rsvp.spec.ts                           # NEW (E2E tests)
+```
+
+**Structure Decision**: Follows existing hexagonal architecture. New use case port + implementation in existing service. Single new endpoint added to existing controller.
+
+## Complexity Tracking
+
+No constitution violations — table not needed.