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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 = "sqlite"
+  url      = env("DATABASE_URL")
+}
+
+model User {
+  id       String @id @default(cuid())
+  username String @unique
+  password String
+  chats    Chat[]
+}
+
+model Chat {
+  id        String    @id @default(cuid())
+  createdAt DateTime  @default(now())
+  updatedAt DateTime  @updatedAt
+  title     String
+  userId    String
+  user      User      @relation(fields: [userId], references: [id])
+  messages  Message[]
+}
+
+model Message {
+  id        String   @id @default(cuid())
+  createdAt DateTime @default(now())
+  role      String   // 'user' or 'assistant'
+  content   String
+  chatId    String
+  chat      Chat     @relation(fields: [chatId], references: [id], onDelete: Cascade)
+}