type Message @table(name: "messages") {
  id: UUID! @default(expr: "uuidV4()")
  conversationId: UUID!  # conversation_id (FK lógica a Conversation.id)
  senderName: String!
  content: String!
  readBy: String         # read_by (jsonb -> String, array de user IDs)
  createdDate: Timestamp @default(expr: "request.time")
  updatedDate: Timestamp @default(expr: "request.time")
  createdBy: String @default(expr: "auth.uid")
}