refactor: Update Prisma schema to include createdAt field in User and RoomMessage models

prisma/schema.prisma

@@ -11,10 +11,12 @@ model User {
     id        String   @id @default(cuid())
     username  String?
     role      Role     @default(STUDENT)
+    createdAt DateTime @default(now())
 
     Class                Class[]
     SentMessages         UserMessage[]          @relation("SentMessages")
     ReceivedMessages     UserMessage[]          @relation("ReceivedMessages")
+    RoomSurveyAnswerUser RoomSurveyAnswerUser[]
 }
 
 model UserMessage {
@@ -26,22 +28,26 @@ model UserMessage {
 
     receiver         User   @relation(fields: [receiver_user_Id], references: [id], name: "ReceivedMessages")
     receiver_user_Id String
+
+    createdAt DateTime @default(now())
 }
 
 model Class {
     id        String   @id @default(cuid())
     name      String
+    createdAt DateTime @default(now())
 
     ClassRoom Room[]
-    students  User[]
+    Students  User[]
 }
 
 model Room {
     id        String         @id @default(cuid())
     name      String
-    class     Class[]
+    Class     Class[]
     Messages  RoomMessage[]
     Documents RoomDocument[]
+    Surveys   RoomSurvey[]
 }
 
 model RoomMessage {
@@ -58,6 +64,34 @@ model RoomDocument {
     roomId  String
 }
 
+model RoomSurvey {
+    id        Int      @id @default(autoincrement())
+    content   String
+    Room      Room     @relation(fields: [roomId], references: [id])
+    roomId    String
+    createdAt DateTime @default(now())
+    endAt     DateTime?
+
+    Answers RoomSurveyAnswer[]
+}
+
+model RoomSurveyAnswer {
+    id                   Int                    @id @default(autoincrement())
+    content              String
+    Survey               RoomSurvey             @relation(fields: [surveyId], references: [id])
+    surveyId             Int
+    isRight              Boolean
+    Users RoomSurveyAnswerUser[]
+}
+
+model RoomSurveyAnswerUser {
+    id       Int              @id @default(autoincrement())
+    User     User             @relation(fields: [userId], references: [id])
+    userId   String
+    Answer   RoomSurveyAnswer @relation(fields: [answerId], references: [id])
+    answerId Int
+}
+
 enum Role {
     STUDENT
     ADMIN