database + tables creation

srcs/backend/dockerfile

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+FROM node:20-alpine
+
+WORKDIR /app
+
+COPY package*.json ./
+
+RUN npm install
+RUN npm install dotenv
+RUN npm install pg
+
+COPY . .
+
+EXPOSE 3001
+
+ENV NODE_ENV=development
+
+CMD ["node", "index.js"]

srcs/backend/index.js

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+require('dotenv').config();
+const { Pool } = require('pg');
+
+const pool = new Pool
+({
+	user: process.env.POSTGRES_USER,
+	host: process.env.POSTGRES_HOST,
+	database: process.env.POSTGRES_DB,
+	password: process.env.POSTGRES_PASSWORD,
+	port: 5432,
+});
+
+async function waitForDb(retries = 10, delay = 2000)
+{
+	for (let i = 0; i < retries; i++)
+	{
+		try
+		{
+			await pool.query('SELECT 1');
+			console.log('Database is ready!');
+			return ;
+		}
+		catch (err)
+		{
+			await new Promise(r =>  setTimeout(r, delay));
+		}
+	}
+	throw new Error('Could not connect to database after multiple attempts');
+}
+
+async function createTables()
+{
+	try
+	{
+		await pool.query(`
+			CREATE TABLE IF NOT EXISTS users (
+				id SERIAL PRIMARY KEY,
+				username VARCHAR(50) UNIQUE NOT NULL,
+				email VARCHAR(100),
+				created_at TIMESTAMP DEFAULT NOW()
+			);
+			
+			CREATE TABLE IF NOT EXISTS messages(
+				id SERIAL PRIMARY KEY,
+				sender_id INT REFERENCES users(id),
+				received_id INT REFERENCES users(id),
+				content TEXT,
+				created_at TIMESTAMP DEFAULT NOW()
+			);
+		`);
+		console.log('Tables created!');
+	}
+	catch (err)
+	{
+		console.error('Error creating tables:', err);
+	}
+}
+
+const express = require('express');
+const app = express();
+
+async function startServer()
+{
+	await waitForDb();
+
+	await createTables();
+
+	app.get('/', (req, res) => res.send('Backend running'));
+
+	app.listen(3001, () =>
+	{
+		console.log('Server ready and listening');
+	});
+}
+
+startServer();

srcs/backend/package.json

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+{
+	"dependencies":
+	{
+		"express": "^4.18.2"
+	}
+}