feat: add Drizzle ORM support and update README with environment setup and migration scripts

Backend/.env.example

@@ -0,0 +1 @@
+DATABASE_URL=postgres://username:password@localhost:5432/database_name

Backend/README.md

@@ -1,15 +1,47 @@
 # backend
 
-To install dependencies:
+## Install
 
 ```bash
 bun install
 ```
 
-To run:
+## Environment
+
+Create a `.env` file:
 
 ```bash
-bun run index.ts
+cp .env.example .env
 ```
 
-This project was created using `bun init` in bun v1.3.5. [Bun](https://bun.com) is a fast all-in-one JavaScript runtime.
+Set:
+
+```bash
+DATABASE_URL=postgres://username:password@localhost:5432/database_name
+```
+
+## Run app
+
+```bash
+bun run dev
+```
+
+## Drizzle ORM
+
+Generate migrations:
+
+```bash
+bun run db:generate
+```
+
+Apply migrations:
+
+```bash
+bun run db:migrate
+```
+
+Open Drizzle Studio:
+
+```bash
+bun run db:studio
+```

Backend/db/client.ts

@@ -0,0 +1,15 @@
+import 'dotenv/config';
+import { drizzle } from 'drizzle-orm/node-postgres';
+import { Pool } from 'pg';
+
+import * as schema from './schema';
+
+if (!process.env.DATABASE_URL) {
+  throw new Error('DATABASE_URL is not set');
+}
+
+export const pool = new Pool({
+  connectionString: process.env.DATABASE_URL,
+});
+
+export const db = drizzle(pool, { schema });

Backend/db/schema.ts

@@ -0,0 +1,8 @@
+import { pgTable, timestamp, uuid, varchar } from 'drizzle-orm/pg-core';
+
+export const users = pgTable('users', {
+  id: uuid('id').defaultRandom().primaryKey(),
+  email: varchar('email', { length: 255 }).notNull().unique(),
+  name: varchar('name', { length: 255 }).notNull(),
+  createdAt: timestamp('created_at', { withTimezone: true }).defaultNow().notNull(),
+});

Backend/drizzle.config.ts

@@ -0,0 +1,17 @@
+import 'dotenv/config';
+import { defineConfig } from 'drizzle-kit';
+
+if (!process.env.DATABASE_URL) {
+  throw new Error('DATABASE_URL is not set');
+}
+
+export default defineConfig({
+  schema: './db/schema.ts',
+  out: './drizzle',
+  dialect: 'postgresql',
+  dbCredentials: {
+    url: process.env.DATABASE_URL,
+  },
+  strict: true,
+  verbose: true,
+});

Backend/implementation-plan.mdc

@@ -0,0 +1,3 @@
+---
+alwaysApply: true
+---

Backend/package.json

@@ -11,6 +11,7 @@
     "@types/jsonwebtoken": "^9.0.10",
     "@types/node": "^25.2.1",
     "@types/pg": "^8.16.0",
+    "drizzle-kit": "^0.31.0",
     "ts-node": "^10.9.2"
   },
   "peerDependencies": {
@@ -22,6 +23,7 @@
     "bcrypt": "^6.0.0",
     "cors": "^2.8.6",
     "dotenv": "^17.2.4",
+    "drizzle-orm": "^0.44.0",
     "express": "^5.2.1",
     "helmet": "^8.1.0",
     "jsonwebtoken": "^9.0.3",
@@ -31,5 +33,13 @@
     "socket.io": "^4.8.3",
     "uuid": "^13.0.0",
     "zod": "^4.3.6"
+  },
+  "scripts": {
+    "start": "bun run index.ts",
+    "dev": "bun --watch index.ts",
+    "db:generate": "drizzle-kit generate",
+    "db:migrate": "drizzle-kit migrate",
+    "db:push": "drizzle-kit push",
+    "db:studio": "drizzle-kit studio"
   }
 }