update graphql model

@@ -8,36 +8,34 @@ type User {
   emailSecret: String
   phoneSecret: String
   bio: String
-  rooms: [Room]
-  createdAt: String
+  groups: [Group]
   messages: [Message]
-  sender: [User]
-  receiver: [User]
+  directMessages: [DirectMessage]
+  createdAt: String
 }
 
-type Room {
+type Group {
   id: ID!
   name: String!
   participants: [User]
-  categories: [Category]
   messages: [Message]
+  files: String
+  createdAt: String
 }
 
-type Category {
+type DirectMessage {
   id: ID!
-  name: String
-  room: Room
-  messages: [Message]
+  text: String!
+  sender: User!
+  createdAt: String
 }
 
 type Message {
   id: ID!
   text: String!
   sender: User!
-  room: Room!
-  category: Category
+  group: Group!
   createdAt: String
-  updatedAt: String
 }
 
 type AuthPayload {