AI:adding prisma, redesign

web/prisma/schema.prisma

@@ -0,0 +1,40 @@
+datasource db {
+  provider = "sqlite"
+  url      = "file:./dev.db"
+}
+
+generator client {
+  provider = "prisma-client-js"
+}
+
+model User {
+  id        String    @id @default(uuid())
+  username  String    @unique
+  password  String
+  sessions  Session[]
+  chats     Chat[]
+}
+
+model Session {
+  id           String    @id @default(uuid())
+  userId       String
+  user         User      @relation(fields: [userId], references: [id])
+  language     String?
+  lastLogin    DateTime
+  currentChatId String?
+}
+
+model Chat {
+  id           String    @id
+  participants User[]
+  messages     Message[]
+}
+
+model Message {
+  id        String   @id @default(uuid())
+  chatId    String
+  chat      Chat     @relation(fields: [chatId], references: [id])
+  senderId  String
+  content   String
+  timestamp DateTime @default(now())
+}