Enforce uniqueness on Json fields

model Post {
  id           String        @id @default(cuid())
  title        String
  content      String
  collectionId String
  collection   Collection    @relation(fields: [collectionId], references: [id])
  metadata     PostMetadata? @relation(name: "PostMetadata")
  extraData    Json?         @db.JsonB
  tags         Tag[]         @relation(name: "PostTags")
}

{
surah: string:
verse: number
}