update DB schema

@@ -18,18 +18,17 @@ model User {
   emailSecret String?   @default("")
   phoneSecret String?   @default("")
   bio         String?   @default("")
-  room        Room      @relation(fields: [roomId], references: [id])
-  roomId      Int
+  rooms       Room[]    @relation(references: [id])
   messages    Message[]
-  sender      User      @relation("SenderReceiver", fields: [id], references: [id])
-  receiver    User?     @relation("SenderReceiver")
+  sender      User[]    @relation("SenderReceiver", references: [id])
+  receiver    User[]    @relation("SenderReceiver", references: [id])
   createdAt   DateTime? @default(now())
 }
 
 model Room {
   id           Int        @default(autoincrement()) @id
   name         String
-  participants User[]
+  participants User[]     @relation(references: [id])
   categories   Category[]
   messages     Message[]
 }