fix(health): add Supabase keepalive ping to GET / health check

UptimeRobot pings GET / every 5 minutes. Previously static response
only kept Node process alive but let Supabase connection pool go cold.
Now executes a lightweight HEAD query (profiles, limit 1) to maintain
DB connection warmth. Always returns 200 with db status field for
observability.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/index.ts

@@ -1,50 +1,71 @@
-import 'dotenv/config'
+import "dotenv/config";
-import { Hono } from 'hono'
+import { Hono } from "hono";
-import { cors } from 'hono/cors'
+import { cors } from "hono/cors";
-import { serve } from '@hono/node-server'
+import { serve } from "@hono/node-server";
-import { createNodeWebSocket } from '@hono/node-ws'
+import { createNodeWebSocket } from "@hono/node-ws";
-import authRoutes from './routes/auth.js'
+import authRoutes from "./routes/auth.js";
-import plansRoutes from './routes/plans.js'
+import plansRoutes from "./routes/plans.js";
-import simulationsRoutes from './routes/simulations.js'
+import simulationsRoutes from "./routes/simulations.js";
-import sujetsRoutes from './routes/sujets.js'
+import sujetsRoutes from "./routes/sujets.js";
-import correctionsRoutes from './routes/corrections.js'
+import correctionsRoutes from "./routes/corrections.js";
-import stripeRoutes from './routes/stripe.js'
+import stripeRoutes from "./routes/stripe.js";
-import createT2LiveRoutes from './routes/t2live.js'
+import createT2LiveRoutes from "./routes/t2live.js";
-import usersRoutes from './routes/users.js'
+import usersRoutes from "./routes/users.js";
+import { supabase } from "./lib/supabase.js";
 
-const app = new Hono()
+const app = new Hono();
-const { upgradeWebSocket, injectWebSocket } = createNodeWebSocket({ app })
+const { upgradeWebSocket, injectWebSocket } = createNodeWebSocket({ app });
 
 app.use(
-  '*',
+  "*",
   cors({
     origin: [
-      'https://expria.app',
+      "https://expria.app",
-      'http://localhost:5173',
+      "http://localhost:5173",
-      'http://localhost:5174',
+      "http://localhost:5174",
     ],
-    allowMethods: ['GET', 'POST', 'PATCH', 'PUT', 'DELETE', 'OPTIONS'],
+    allowMethods: ["GET", "POST", "PATCH", "PUT", "DELETE", "OPTIONS"],
-    allowHeaders: ['Content-Type', 'Authorization', 'X-Api-Version'],
+    allowHeaders: ["Content-Type", "Authorization", "X-Api-Version"],
-  })
+  }),
-)
+);
 
-app.get('/', (c) => {
+// Health check — exécute un SELECT 1 léger sur Supabase pour garder le pool
-  return c.json({ message: 'Expria API — OK' }, 200)
+// de connexions DB actif (ping UptimeRobot toutes les 5 min sur Render Starter).
-})
+// Le endpoint retourne toujours 200 (liveness) ; le champ `db` reporte l'état
+// réel de la connexion pour observabilité.
+const HEALTH_DB_TIMEOUT_MS = 5000;
 
-app.route('/auth', authRoutes)
+app.get("/", async (c) => {
-app.route('/plans', plansRoutes)
+  const probe = supabase.from("profiles").select("id", { head: true }).limit(1);
-app.route('/simulations', simulationsRoutes)
+  const timeout = new Promise<{ error: Error }>((resolve) =>
-app.route('/sujets', sujetsRoutes)
+    setTimeout(
-app.route('/corrections', correctionsRoutes)
+      () => resolve({ error: new Error("HEALTH_DB_TIMEOUT") }),
-app.route('/stripe', stripeRoutes)
+      HEALTH_DB_TIMEOUT_MS,
-app.route('/t2', createT2LiveRoutes(upgradeWebSocket))
+    ),
-app.route('/users', usersRoutes)
+  );
 
-const port = Number(process.env.PORT) || 3000
+  try {
+    const result = await Promise.race([probe, timeout]);
+    const db = "error" in result && result.error ? "error" : "connected";
+    return c.json({ message: "Expria API — OK", db }, 200);
+  } catch {
+    return c.json({ message: "Expria API — OK", db: "error" }, 200);
+  }
+});
+
+app.route("/auth", authRoutes);
+app.route("/plans", plansRoutes);
+app.route("/simulations", simulationsRoutes);
+app.route("/sujets", sujetsRoutes);
+app.route("/corrections", correctionsRoutes);
+app.route("/stripe", stripeRoutes);
+app.route("/t2", createT2LiveRoutes(upgradeWebSocket));
+app.route("/users", usersRoutes);
+
+const port = Number(process.env.PORT) || 3000;
 
 const server = serve({ fetch: app.fetch, port }, () => {
-  console.log(`Expria API listening on port ${port}`)
+  console.log(`Expria API listening on port ${port}`);
-})
+});
 
-injectWebSocket(server)
+injectWebSocket(server);