Edu_helper/backend/prisma/schema.prisma

generator client {
  provider      = "prisma-client-js"
  binaryTargets = ["native", "linux-musl-openssl-3.0.x", "linux-musl-arm64-openssl-3.0.x"]
}

datasource db {
  provider = "postgresql"
  url      = env("DATABASE_URL")
}

enum Role {
  TUTOR
  STUDENT
}

model User {
  id           Int     @id @default(autoincrement())
  username     String  @unique
  passwordHash String
  role         Role
  displayName  String?

  tutoringAssignments TutorAssignment[] @relation("TutorInAssignment")
  studentAssignment   TutorAssignment?  @relation("StudentInAssignment")

  questions    Question[]
  chatMessages ChatMessage[]
  textbooks    Textbook[]
  tests        Test[]
  reports      Report[]
  hallPhotos   HallPhoto[]
}

model TutorAssignment {
  tutorId   Int
  studentId Int @unique
  tutor     User @relation("TutorInAssignment", fields: [tutorId], references: [id], onDelete: Cascade)
  student   User @relation("StudentInAssignment", fields: [studentId], references: [id], onDelete: Cascade)

  @@id([tutorId, studentId])
}

model Setting {
  key   String @id
  value String
}

model ChatMessage {
  id        Int      @id @default(autoincrement())
  studentId Int
  student   User     @relation(fields: [studentId], references: [id], onDelete: Cascade)
  role      String
  content   String
  createdAt DateTime @default(now())
}

model Question {
  id        Int      @id @default(autoincrement())
  studentId Int
  student   User     @relation(fields: [studentId], references: [id], onDelete: Cascade)
  text      String
  answer    String?
  date      String
  createdAt DateTime @default(now())
}

model Textbook {
  id        Int      @id @default(autoincrement())
  studentId Int
  student   User     @relation(fields: [studentId], references: [id], onDelete: Cascade)
  topic     String
  content   String
  createdAt DateTime @default(now())
}

model Test {
  id        Int          @id @default(autoincrement())
  studentId Int
  student   User         @relation(fields: [studentId], references: [id], onDelete: Cascade)
  topic     String
  questions String
  createdAt DateTime     @default(now())
  results   TestResult[]
}

model TestResult {
  id        Int      @id @default(autoincrement())
  testId    Int
  answers   String
  score     Int
  total     Int
  createdAt DateTime @default(now())
  test      Test     @relation(fields: [testId], references: [id], onDelete: Cascade)
}

model Report {
  id        Int      @id @default(autoincrement())
  studentId Int
  student   User     @relation(fields: [studentId], references: [id], onDelete: Cascade)
  date      String
  content   String
  createdAt DateTime @default(now())
}

model HallPhoto {
  id           Int      @id @default(autoincrement())
  studentId    Int
  student      User     @relation(fields: [studentId], references: [id], onDelete: Cascade)
  date         String
  fileName     String
  originalName String   @default("")
  mimeType     String
  createdAt    DateTime @default(now())
}