Add CleaningAbsence model for Putzplan-Kalender

prisma/schema.prisma

@@ -145,6 +145,7 @@ model User {
   createdTickets      Ticket[]         @relation("TicketCreator")
   assignedTickets     Ticket[]         @relation("TicketAssignee")
   cleaningTasks       CleaningTask[]
+  cleaningAbsences    CleaningAbsence[]
   expensesPaid        Expense[]
   expenseShares       ExpenseShare[]
   handoverProtocols   HandoverProtocol[]
@@ -333,6 +334,24 @@ model CleaningTask {
   @@map("cleaning_tasks")
 }
 
+// Abwesenheiten im Putzplan-Kalender (Urlaub, "kann nicht putzen" o. Ä.).
+// Für alle Mieter sichtbar (gemeinschaftliche Organisationsinfo), aber nur
+// vom jeweiligen Mieter selbst oder Vermieter/Admin anlegbar/löschbar.
+model CleaningAbsence {
+  id     String @id @default(uuid())
+  userId String @map("user_id")
+  user   User   @relation(fields: [userId], references: [id])
+
+  startDate DateTime @map("start_date")
+  endDate   DateTime @map("end_date")
+  note      String?
+
+  createdAt DateTime @default(now()) @map("created_at")
+
+  @@index([userId, startDate])
+  @@map("cleaning_absences")
+}
+
 // ----------------------------------------------------------------------------
 // INVENTORY (Möbel & Geräte)
 // ----------------------------------------------------------------------------