diff --git a/backend/controllers/Chat.ts b/backend/controllers/Chat.ts
index 1c76c5a..cec9ce6 100644
--- a/backend/controllers/Chat.ts
+++ b/backend/controllers/Chat.ts
@@ -1,3 +1,6 @@
+import type { Socket } from "socket.io";
+import ChatMessagePayload from "../../common/requests/ChatMessagePayload";
+
 class ChatController {
     /**
      * Broadcasts a message to all connected clients
@@ -6,7 +9,7 @@ class ChatController {
      * @param data The message data
      * @param socket The client socket
      */
-    public static async broadcastMessage(data: ChatMessagePayload, socket: SocketIO.Socket) {
+    public static async broadcastMessage(data: ChatMessagePayload, socket: Socket) {
         // TODO: Broadcast the message to all clients
         /**
          * VALIDATION
diff --git a/backend/index.ts b/backend/index.ts
index 9bfbe33..2164a12 100644
--- a/backend/index.ts
+++ b/backend/index.ts
@@ -22,6 +22,8 @@ WSS.io.on("connection", (socket: Socket) => {
     const userAgent = socket.handshake.headers["user-agent"];
     console.log(`Socket connected from ${ip} using ${userAgent}`);
 
+    WSS.updateClassement(socket);
+
     socket.on("place-pixel", (data) => CanvasController.placePixel(data, socket));
     socket.on("message", (data) => ChatController.broadcastMessage(data, socket));
 
diff --git a/backend/package.json b/backend/package.json
index 5e30315..da401e1 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -8,7 +8,8 @@
         "build": "tsc",
         "start": "node index.js",
         "lint": "eslint . --ext .ts",
-        "format": "prettier --write ."
+        "format": "prettier --write .",
+        "seed": "ts-node prisma/seed.ts"
     },
     "author": "",
     "license": "ISC",
diff --git a/backend/prisma/migrations/20240218154047_add_unique_emails/migration.sql b/backend/prisma/migrations/20240218154047_add_unique_emails/migration.sql
new file mode 100644
index 0000000..8b30391
--- /dev/null
+++ b/backend/prisma/migrations/20240218154047_add_unique_emails/migration.sql
@@ -0,0 +1,8 @@
+/*
+  Warnings:
+
+  - A unique constraint covering the columns `[devinciEmail]` on the table `Account` will be added. If there are existing duplicate values, this will fail.
+
+*/
+-- CreateIndex
+CREATE UNIQUE INDEX `Account_devinciEmail_key` ON `Account`(`devinciEmail`);
diff --git a/backend/prisma/migrations/20240218154912_add_defaults/migration.sql b/backend/prisma/migrations/20240218154912_add_defaults/migration.sql
new file mode 100644
index 0000000..ed9a3f2
--- /dev/null
+++ b/backend/prisma/migrations/20240218154912_add_defaults/migration.sql
@@ -0,0 +1,15 @@
+/*
+  Warnings:
+
+  - The `lastPixelTime` column on the `Account` table would be dropped and recreated. This will lead to data loss if there is data in the column.
+
+*/
+-- AlterTable
+ALTER TABLE `Account` MODIFY `isMuted` BOOLEAN NOT NULL DEFAULT false,
+    MODIFY `isBanned` BOOLEAN NOT NULL DEFAULT false,
+    MODIFY `isAdmin` BOOLEAN NOT NULL DEFAULT false,
+    MODIFY `placedPixels` INTEGER NOT NULL DEFAULT 0,
+    MODIFY `timeAlive` INTEGER NULL,
+    DROP COLUMN `lastPixelTime`,
+    ADD COLUMN `lastPixelTime` DATETIME(3) NULL,
+    MODIFY `lastSentMessageTimes` JSON NULL;
diff --git a/backend/prisma/schema.prisma b/backend/prisma/schema.prisma
index 6249c60..094660b 100644
--- a/backend/prisma/schema.prisma
+++ b/backend/prisma/schema.prisma
@@ -12,14 +12,14 @@ datasource db {
 
 model Account {
     id                   Int      @id @default(autoincrement())
-    devinciEmail         String
-    isMuted              Boolean
-    isBanned             Boolean
-    isAdmin              Boolean
-    placedPixels         Int
-    timeAlive            Int
-    lastPixelTime        Int
-    lastSentMessageTimes Json
+    devinciEmail         String @unique()
+    isMuted              Boolean @default(false)
+    isBanned             Boolean @default(false)
+    isAdmin              Boolean @default(false)
+    placedPixels         Int @default(0)
+    timeAlive            Int?
+    lastPixelTime        DateTime?
+    lastSentMessageTimes Json?
 }
 
 model LogEntry {
diff --git a/backend/prisma/seed.ts b/backend/prisma/seed.ts
new file mode 100644
index 0000000..9eec5eb
--- /dev/null
+++ b/backend/prisma/seed.ts
@@ -0,0 +1,34 @@
+import { PrismaClient } from "@prisma/client";
+
+const prisma = new PrismaClient();
+
+async function main() {
+    const userCount = Number(process.argv.find(arg => arg.startsWith("userCount="))?.replace(/^userCount=/, "")) ?? 10;
+    const usersPromise = [] as Promise<unknown>[];
+    for(let i = 1; i <= userCount; i++) {
+        const user = prisma.account.upsert({
+            where: {
+                devinciEmail: `user_${i}@edu.devinci.fr`
+            },
+            update: {
+                placedPixels: Math.floor(Math.random() * 3000)
+            },
+            create: {
+                devinciEmail: `user_${i}@edu.devinci.fr`,
+                placedPixels: Math.floor(Math.random() * 3000)
+            }
+        });
+        usersPromise.push(user);
+    }
+    await Promise.all(usersPromise);
+}
+
+main()
+    .then(async () => {
+        await prisma.$disconnect();
+    })
+    .catch(async (e) => {
+        console.error(e);
+        await prisma.$disconnect();
+        process.exit(1);
+    });
\ No newline at end of file
diff --git a/backend/server/Websocket.ts b/backend/server/Websocket.ts
index b77be76..25a74dd 100644
--- a/backend/server/Websocket.ts
+++ b/backend/server/Websocket.ts
@@ -1,11 +1,38 @@
 import type http from "http";
 import SocketIO from "socket.io";
+import type { Server, Socket } from "socket.io";
+import { PrismaClient } from "@prisma/client";
+
+const client = new PrismaClient();
 
 class WSS {
-    public static io: SocketIO.Server;
+    public static io: Server;
 
     public static init(server: http.Server) {
-        WSS.io = new SocketIO.Server(server);
+        WSS.io = new SocketIO.Server(server, {
+            cors: {
+                origin: process.env.NODE_ENV === "production" ? undefined : "http://localhost:5173"
+            }
+        });
+    }
+
+    /**
+     * Sends an 'updateClassement' event to one socket if provided. \
+     * If no socket is provided, broadcast the event to all connected clients.
+     * @param socket 
+     */
+    static async updateClassement(socket?: Socket) {
+        const classement = await client.account.findMany({
+            select: {
+                devinciEmail: true,
+                placedPixels: true
+            },
+            orderBy: {
+                placedPixels: "desc"
+            }
+        });
+        if(!socket) this.io.emit("classementUpdate", classement);
+        else socket.emit("classementUpdate", classement);
     }
 }
 
diff --git a/common/interfaces/classementItem.interface.ts b/common/interfaces/classementItem.interface.ts
new file mode 100644
index 0000000..ade0fc0
--- /dev/null
+++ b/common/interfaces/classementItem.interface.ts
@@ -0,0 +1,6 @@
+interface classementItem {
+  devinciEmail: string;
+  placedPixels: number;
+}
+
+export default classementItem
\ No newline at end of file
diff --git a/common/requests/ChatMessagePayload.ts b/common/requests/ChatMessagePayload.ts
new file mode 100644
index 0000000..61cb538
--- /dev/null
+++ b/common/requests/ChatMessagePayload.ts
@@ -0,0 +1,5 @@
+interface ChatMessagePayload {
+  [index: string] : Record<string, any>
+}
+
+export default ChatMessagePayload
\ No newline at end of file
diff --git a/frontend/src/App.tsx b/frontend/src/App.tsx
index 84f81df..20f7b38 100644
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@@ -1,8 +1,39 @@
 // import { useState } from 'react'
+import { useEffect, useState } from 'react';
 import './App.css'
 import LoginComponent from './pages/login'
+import { socket } from './socket';
+import classementItem from '../../common/interfaces/classementItem.interface'
 
 function App() {
+  // eslint-disable-next-line @typescript-eslint/no-unused-vars
+  const [classement, setClassement] = useState<classementItem[]>([])
+  // eslint-disable-next-line @typescript-eslint/no-unused-vars
+  const [isConnected, setIsConnected] = useState(socket.connected);
+
+  useEffect(() => {
+    function onConnect() {
+      setIsConnected(true);
+    }
+
+    function onDisconnect() {
+      setIsConnected(false);
+    }
+
+    function onclassementUpdate(data: classementItem[]) {
+      setClassement(data)
+    }
+
+    socket.on('connect', onConnect);
+    socket.on('disconnect', onDisconnect);
+    socket.on('classementUpdate', onclassementUpdate);
+
+    return () => {
+      socket.off('connect', onConnect);
+      socket.off('disconnect', onDisconnect);
+      socket.off('classementUpdate', onclassementUpdate);
+    };
+  }, []);
 
   // affichage (render)
   return (
diff --git a/frontend/src/socket.ts b/frontend/src/socket.ts
new file mode 100644
index 0000000..6ae7197
--- /dev/null
+++ b/frontend/src/socket.ts
@@ -0,0 +1,6 @@
+import { io } from 'socket.io-client';
+
+// "undefined" means the URL will be computed from the `window.location` object
+const URL = process.env.NODE_ENV === 'production' ? undefined : 'http://localhost:3000';
+
+export const socket = io(URL);
\ No newline at end of file