---
description: Clinic appointments — delete/patient locks when treatment linked
globs: frontend/src/components/ui/appointments/**,frontend/src/components/appointments/**,backend/src/modules/appointments/**
alwaysApply: false
---

# Appointments

- List includes `hasTreatment` when a `Treatment` row is linked (`appointmentId`).
- **Patient change** blocked while linked → `APPOINTMENT_PATIENT_LOCKED` (UI: `patientLockedHint`).
- **Delete** blocked while linked → `APPOINTMENT_HAS_TREATMENT` (hide delete + `deleteBlockedHint`). Empty appointments (no treatment yet) remain deletable.
- **Past days:** new bookings stay blocked. Existing appointments **without** treatment can be edited/deleted; with treatment → toast `infoEditBlockedHasTreatment` (no modal). Banner clicks are not gated by `canBook` (slots still are).
- **Disabled feedback:** use `title` + click `toast.showInfo` with `common.readOnlyAccess` (same key as Staff/Patients) or the domain reason (`infoPastViewOnly`, `infoEditBlockedHasTreatment`).
- Prisma: `Treatment.appointmentId` is `onDelete: SetNull` — deleting an appointment does **not** cascade-delete treatments/cases/tasks; do not rely on cascade for cleanup.
