Best Practices for Updating Nested Relations in Prisma with NestJS and SQL Server

UserConfig
|- Preferences? // 1:1
|  |- NotificationSettings[] // 1:N
|  |  `- EmailSettings? // 1:1
|  `- ThemeSettings? // 1:1
`- AccountSettings? // 1:1
   `- PrivacySettings[] // 1:N

model UserConfig {
  id               Int    @id @default(autoincrement())
  userId           Int    @unique
  preferences      Preferences?
  accountSettings  AccountSettings?
}

model Preferences {
  id                    Int    @id @default(autoincrement())
  userConfigId          Int    @unique
  notificationSettings  NotificationSettings[]
  themeSettings         ThemeSettings?
  userConfig            UserConfig @relation(fields: [userConfigId], references: [id], onDelete: Cascade)
}

model NotificationSettings {
  id              Int    @id @default(autoincrement())
  type            String // "EMAIL" | "SMS"
  preferencesId   Int
  emailSettings   EmailSettings?
  preferences     Preferences @relation(fields: [preferencesId], references: [id], onDelete: Cascade)
}

model EmailSettings {
  id                   Int    @id @default(autoincrement())
  email                String
  notificationSettingsId Int    @unique
  notificationSettings NotificationSettings @relation(fields: [notificationSettingsId], references: [id], onDelete: Cascade)
}

model ThemeSettings {
  id            Int    @id @default(autoincrement())
  theme         String
  preferencesId Int    @unique
  preferences   Preferences @relation(fields: [preferencesId], references: [id], onDelete: Cascade)
}

model AccountSettings {
  id               Int    @id @default(autoincrement())
  userConfigId     Int    @unique
  privacySettings  PrivacySettings[]
  userConfig       UserConfig @relation(fields: [userConfigId], references: [id], onDelete: Cascade)
}

model PrivacySettings {
  id                Int    @id @default(autoincrement())
  setting           String
  accountSettingsId Int
  accountSettings   AccountSettings @relation(fields: [accountSettingsId], references: [id], onDelete: Cascade)
}