update DB schema

@@ -18,35 +18,38 @@ model User {
   emailSecret String?   @default("")
   phoneSecret String?   @default("")
   bio         String?   @default("")
-  rooms          Room[]    @relation(references: [id])
-  sendMessage    Message[] @relation("Sender")
-  receiveMessage Message[] @relation("Receiver")
+  room        Room      @relation(fields: [roomId], references: [id])
+  roomId      Int
+  messages    Message[]
+  sender      User      @relation("SenderReceiver", fields: [id], references: [id])
+  receiver    User?     @relation("SenderReceiver")
   createdAt   DateTime? @default(now())
 }
 
 model Room {
   id           Int        @default(autoincrement()) @id
   name         String
-  participants User[]     @relation(references: [id])
+  participants User[]
   categories   Category[]
-  Message      Message[]
+  messages     Message[]
 }
 
 model Category {
   id       Int       @default(autoincrement()) @id
   name     String?   @default("")
-  SubRoom Int
-  room    Room    @relation(fields: [SubRoom], references: [id])
+  room     Room      @relation(fields: [roomId], references: [id])
+  roomId   Int
+  messages Message[]
 }
 
 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?
+  text       String    @default("")
+  sender     User      @relation(fields: [senderId], references: [id])
+  senderId   Int
   room       Room      @relation(fields: [roomId], references: [id])
   roomId     Int
   createdAt  DateTime? @default(now())
+  category   Category? @relation(fields: [categoryId], references: [id])
+  categoryId Int?
 }
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