feature: users with treatment edit permission should now have working hours defined. the appointment grid is now being drawn based on the doctor's working hours.

backend/prisma/schema.prisma

@@ -217,6 +217,7 @@ model Membership {
 
   permissions MembershipPermission[]
   invitations StaffInvitation[]
+  workingHoursSchedule StaffWorkingHoursSchedule?
 
   createdAt DateTime @default(now())
   updatedAt DateTime @updatedAt
@@ -225,6 +226,34 @@ model Membership {
   @@map("memberships")
 }
 
+model StaffWorkingHoursSchedule {
+  id               String @id @default(uuid())
+  membershipId     String @unique
+  autoRepeatWeekly Boolean @default(true)
+
+  membership Membership @relation(fields: [membershipId], references: [id], onDelete: Cascade)
+  blocks     StaffWorkingHoursBlock[]
+
+  createdAt DateTime @default(now())
+  updatedAt DateTime @updatedAt
+
+  @@map("staff_working_hours_schedules")
+}
+
+model StaffWorkingHoursBlock {
+  id          String @id @default(uuid())
+  scheduleId  String
+  dayOfWeek   Int
+  startMinute Int
+  endMinute   Int
+  sortOrder   Int    @default(0)
+
+  schedule StaffWorkingHoursSchedule @relation(fields: [scheduleId], references: [id], onDelete: Cascade)
+
+  @@index([scheduleId, dayOfWeek, sortOrder])
+  @@map("staff_working_hours_blocks")
+}
+
 model StaffInvitation {
   id String @id @default(uuid())