First version

prisma/migrations/20231205211834_create_models/migration.sql

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+-- CreateTable
+CREATE TABLE "Group" (
+    "id" TEXT NOT NULL,
+    "name" TEXT NOT NULL,
+
+    CONSTRAINT "Group_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateTable
+CREATE TABLE "Participant" (
+    "id" TEXT NOT NULL,
+    "name" TEXT NOT NULL,
+    "groupId" TEXT NOT NULL,
+
+    CONSTRAINT "Participant_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateTable
+CREATE TABLE "Expense" (
+    "id" TEXT NOT NULL,
+    "title" TEXT NOT NULL,
+    "amount" DECIMAL(65,30) NOT NULL,
+    "paidById" TEXT NOT NULL,
+
+    CONSTRAINT "Expense_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateTable
+CREATE TABLE "ExpensePaidFor" (
+    "expenseId" TEXT NOT NULL,
+    "participantId" TEXT NOT NULL,
+
+    CONSTRAINT "ExpensePaidFor_pkey" PRIMARY KEY ("expenseId","participantId")
+);
+
+-- AddForeignKey
+ALTER TABLE "Participant" ADD CONSTRAINT "Participant_groupId_fkey" FOREIGN KEY ("groupId") REFERENCES "Group"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "Expense" ADD CONSTRAINT "Expense_paidById_fkey" FOREIGN KEY ("paidById") REFERENCES "Participant"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "ExpensePaidFor" ADD CONSTRAINT "ExpensePaidFor_expenseId_fkey" FOREIGN KEY ("expenseId") REFERENCES "Expense"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "ExpensePaidFor" ADD CONSTRAINT "ExpensePaidFor_participantId_fkey" FOREIGN KEY ("participantId") REFERENCES "Participant"("id") ON DELETE RESTRICT ON UPDATE CASCADE;

prisma/migrations/20231205214145_add_group_to_expenses/migration.sql

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+/*
+  Warnings:
+
+  - Added the required column `groupId` to the `Expense` table without a default value. This is not possible if the table is not empty.
+
+*/
+-- AlterTable
+ALTER TABLE "Expense" ADD COLUMN     "groupId" TEXT NOT NULL;
+
+-- AddForeignKey
+ALTER TABLE "Expense" ADD CONSTRAINT "Expense_groupId_fkey" FOREIGN KEY ("groupId") REFERENCES "Group"("id") ON DELETE RESTRICT ON UPDATE CASCADE;

prisma/migrations/20231205214538_change_amount_type/migration.sql

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+/*
+  Warnings:
+
+  - You are about to alter the column `amount` on the `Expense` table. The data in that column could be lost. The data in that column will be cast from `Decimal(65,30)` to `Integer`.
+
+*/
+-- AlterTable
+ALTER TABLE "Expense" ALTER COLUMN "amount" SET DATA TYPE INTEGER;

prisma/migrations/migration_lock.toml

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+# Please do not edit this file manually
+# It should be added in your version-control system (i.e. Git)
+provider = "postgresql"

prisma/schema.prisma

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+// 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])
+}