update prisma schema

@@ -20,6 +20,8 @@ model User {
   bio         String?   @default("")
   rooms       Room[]    @relation(references: [id])
   messages    Message[]
+  sender      Message   @relation("Sender")
+  receiver    Message[] @relation("Receiver")
   createdAt   DateTime? @default(now())
 }
 
@@ -38,6 +40,12 @@ model Category {
 model Message {
   id        Int       @default(autoincrement()) @id
   text      String?   @default("")
-  sender   User    @relation(fields: [senderId], references: [id])
-  senderId Int
+  from      User      @relation("Sender", fields: [fromId], references: [id])
+  fromId    Int
+  to        User      @relation("Receiver", fields: [toId], references: [id])
+  toId      Int
+  room      Room      @relation(fields: [roomId], references: [id])
+  roomId    Int
+  createdAt DateTime?
+  userId    Int?
 }
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