add prisma

prisma/migrations/20250828151958_init/migration.sql

+-- CreateTable
+CREATE TABLE "User" (
+    "id" INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
+    "userName" TEXT NOT NULL,
+    "password" TEXT NOT NULL
+);
+
+-- CreateTable
+CREATE TABLE "Room" (
+    "id" INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
+    "name" TEXT NOT NULL,
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" DATETIME NOT NULL
+);
+
+-- CreateTable
+CREATE TABLE "Message" (
+    "id" INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
+    "content" TEXT NOT NULL,
+    "senderId" INTEGER NOT NULL,
+    "roomId" INTEGER NOT NULL,
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    CONSTRAINT "Message_senderId_fkey" FOREIGN KEY ("senderId") REFERENCES "User" ("id") ON DELETE RESTRICT ON UPDATE CASCADE,
+    CONSTRAINT "Message_roomId_fkey" FOREIGN KEY ("roomId") REFERENCES "Room" ("id") ON DELETE RESTRICT ON UPDATE CASCADE
+);
+
+-- CreateIndex
+CREATE UNIQUE INDEX "User_userName_key" ON "User"("userName");

prisma/migrations/20250829023846_add_cascade_delete_to_messages/migration.sql

+-- RedefineTables
+PRAGMA defer_foreign_keys=ON;
+PRAGMA foreign_keys=OFF;
+CREATE TABLE "new_Message" (
+    "id" INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
+    "content" TEXT NOT NULL,
+    "senderId" INTEGER NOT NULL,
+    "roomId" INTEGER NOT NULL,
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    CONSTRAINT "Message_senderId_fkey" FOREIGN KEY ("senderId") REFERENCES "User" ("id") ON DELETE RESTRICT ON UPDATE CASCADE,
+    CONSTRAINT "Message_roomId_fkey" FOREIGN KEY ("roomId") REFERENCES "Room" ("id") ON DELETE CASCADE ON UPDATE CASCADE
+);
+INSERT INTO "new_Message" ("content", "createdAt", "id", "roomId", "senderId") SELECT "content", "createdAt", "id", "roomId", "senderId" FROM "Message";
+DROP TABLE "Message";
+ALTER TABLE "new_Message" RENAME TO "Message";
+PRAGMA foreign_keys=ON;
+PRAGMA defer_foreign_keys=OFF;

prisma/migrations/migration_lock.toml

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

prisma/schema.prisma

+// This is your Prisma schema file,
+// learn more about it in the docs: https://pris.ly/d/prisma-schema
+
+// Looking for ways to speed up your queries, or scale easily with your serverless or edge functions?
+// Try Prisma Accelerate: https://pris.ly/cli/accelerate-init
+
+generator client {
+  provider = "prisma-client-js"
+  output   = "../generated/prisma"
+  binaryTargets = ["native", "debian-openssl-3.0.x"]
+}
+
+datasource db {
+  provider = "sqlite"
+  url      = env("DATABASE_URL")
+}
+
+model User {
+  id        Int      @id @default(autoincrement())
+  userName  String   @unique
+  password  String
+  messages  Message[] @relation("UserMessages")
+}
+
+model Room {
+  id        Int      @id @default(autoincrement())
+  name      String
+  messages  Message[]
+  createdAt DateTime @default(now())
+  updatedAt DateTime @updatedAt
+}
+
+model Message {
+  id        Int      @id @default(autoincrement())
+  content   String
+  senderId  Int
+  sender    User     @relation("UserMessages", fields: [senderId], references: [id])
+  roomId    Int
+  room      Room     @relation(fields: [roomId], references: [id], onDelete: Cascade)
+  createdAt DateTime @default(now())
+}