spliit/prisma/schema.prisma

// This is your Prisma schema file,
// learn more about it in the docs: https://pris.ly/d/prisma-schema

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

datasource db {
  provider  = "postgresql"
  url       = env("POSTGRES_PRISMA_URL") // uses connection pooling
  directUrl = env("POSTGRES_URL_NON_POOLING") // uses a direct connection
}

model Group {
  id           String        @id
  name         String
  participants Participant[]
  expenses     Expense[]
}

model Participant {
  id              String           @id
  name            String
  group           Group            @relation(fields: [groupId], references: [id])
  groupId         String
  expensesPaidBy  Expense[]
  expensesPaidFor ExpensePaidFor[]
}

model Expense {
  id       String           @id
  group    Group            @relation(fields: [groupId], references: [id])
  title    String
  amount   Int
  paidBy   Participant      @relation(fields: [paidById], references: [id])
  paidById String
  paidFor  ExpensePaidFor[]
  groupId  String
}

model ExpensePaidFor {
  expense       Expense     @relation(fields: [expenseId], references: [id])
  participant   Participant @relation(fields: [participantId], references: [id])
  expenseId     String
  participantId String

  @@id([expenseId, participantId])
}