make name became unique field

@@ -27,7 +27,7 @@ model User {
 
 
 model Room {
 model Room {
   id           Int        @default(autoincrement()) @id
   id           Int        @default(autoincrement()) @id
-  name         String
+  name         String     @unique
   participants User[]     @relation(references: [id])
   participants User[]     @relation(references: [id])
   categories   Category[]
   categories   Category[]
   messages     Message[]
   messages     Message[]
@@ -51,4 +51,4 @@ model Message {
   createdAt  DateTime? @default(now())
   createdAt  DateTime? @default(now())
   category   Category? @relation(fields: [categoryId], references: [id])
   category   Category? @relation(fields: [categoryId], references: [id])
   categoryId Int?
   categoryId Int?
-}
\ No newline at end of file
+}