update database layout

backend/package.json

@@ -4,7 +4,7 @@
   "description": "",
   "license": "MIT",
   "author": "",
-  "type": "commonjs",
+  "type": "module",
   "main": "src/index.js",
   "scripts": {
     "start": "node src/index.js"

backend/src/db.js

@@ -1,15 +1,15 @@
 // copied from one of my older projects
-const mysql = require('mysql2/promise');
+import { createPool } from 'mysql2/promise';
 
 function getEnvVar(name) {
   const value = process.env[name];
-  if (value === null) {
+  if (value == null) {
     throw new Error(`Environment variable ${name} is not defined`);
   }
   return value;
 }
 
-const pool = mysql.createPool({
+const pool = createPool({
   host: getEnvVar('MYSQL_HOST'),
   user: getEnvVar('MYSQL_USER'),
   password: getEnvVar('MYSQL_PASSWORD'),
@@ -18,13 +18,44 @@ const pool = mysql.createPool({
 
 const migrations = [
   {
-    name: "init_dart_table",
+    name: "init",
     up: async (conn) => {
       await conn.query(`
-        CREATE TABLE dart (
-          id INT PRIMARY KEY AUTO_INCREMENT
+        CREATE TABLE IF NOT EXISTS users (
+          id INT PRIMARY KEY AUTO_INCREMENT,
+          name VARCHAR(255) NOT NULL
         )
       `);
+
+      await conn.query(`
+        CREATE TABLE IF NOT EXISTS games (
+          id INT PRIMARY KEY AUTO_INCREMENT,
+          name VARCHAR(255) NOT NULL UNIQUE
+        )
+      `);
+
+      await conn.query(`
+        CREATE TABLE IF NOT EXISTS scores (
+          id INT PRIMARY KEY AUTO_INCREMENT,
+          user_id INT NOT NULL,
+          game_id INT NOT NULL,
+          score INT NOT NULL,
+          created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+          FOREIGN KEY (user_id) REFERENCES users(id),
+          FOREIGN KEY (game_id) REFERENCES games(id),
+          UNIQUE(user_id, game_id)
+        )
+      `);
+
+      await conn.query(`
+        CREATE INDEX IF NOT EXISTS idx_scores_game_score
+        ON scores(game_id, score DESC)
+      `);
+
+      await pool.query(
+        `INSERT INTO games (name) VALUES (?) ON DUPLICATE KEY UPDATE id=id`,
+        ['darts']
+      );
     }
   }
 ];
@@ -64,7 +95,7 @@ async function initDB() {
   }
 }
 
-module.exports = {
+export {
   pool,
   initDB
 };

backend/src/index.js

@@ -1,4 +1,5 @@
-require('dotenv').config()
-const db = require('./db');
+import dotenv from 'dotenv';
+dotenv.config();
+const db = await import('./db.js');
 
 db.initDB();