Server/prisma/schema.prisma

generator client {
    provider = "prisma-client-js"
}

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

model User {
    id       String  @id @default(cuid())
    username String?
    role     Role    @default(STUDENT)

    Class            Class[]
    SentMessages     UserMessage[] @relation("SentMessages")
    ReceivedMessages UserMessage[] @relation("ReceivedMessages")
}

model UserMessage {
    id      Int    @id @default(autoincrement())
    content String

    sender         User   @relation(fields: [sender_user_Id], references: [id], name: "SentMessages")
    sender_user_Id String

    receiver         User   @relation(fields: [receiver_user_Id], references: [id], name: "ReceivedMessages")
    receiver_user_Id String
}

model Class {
    id   String @id @default(cuid())
    name String

    ClassRoom Room[]
    students  User[]
}

model Room {
    id        String         @id @default(cuid())
    name      String
    class     Class[]
    Messages  RoomMessage[]
    Documents RoomDocument[]
}

model RoomMessage {
    id      Int    @id @default(autoincrement())
    content String
    Room    Room   @relation(fields: [roomId], references: [id])
    roomId  String
}

model RoomDocument {
    id      Int    @id @default(autoincrement())
    content String
    Room    Room   @relation(fields: [roomId], references: [id])
    roomId  String
}

enum Role {
    STUDENT
    ADMIN
}