update prisma schema

@@ -19,9 +19,8 @@ model User {
   phoneSecret    String?   @default("")
   bio            String?   @default("")
   rooms          Room[]    @relation(references: [id])
-  messages    Message[]
-  sender      Message   @relation("Sender")
-  receiver    Message[] @relation("Receiver")
+  sendMessage    Message[] @relation("Sender")
+  receiveMessage Message[] @relation("Receiver")
   createdAt      DateTime? @default(now())
 }
 
@@ -40,12 +39,9 @@ model Category {
 model Message {
   id        Int       @default(autoincrement()) @id
   text      String?   @default("")
-  from      User      @relation("Sender", fields: [fromId], references: [id])
-  fromId    Int
-  to        User      @relation("Receiver", fields: [toId], references: [id])
-  toId      Int
+  from      User[]    @relation("Sender", references: [id])
+  to        User[]    @relation("Receiver", references: [id])
   room      Room      @relation(fields: [roomId], references: [id])
   roomId    Int
-  createdAt DateTime?
-  userId    Int?
+  createdAt DateTime? @default(now())
 }
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