fix: restore DB connectivity check to auth health endpoint

Co-Authored-By: Paperclip <noreply@paperclip.ing>

auth/src/auth.ts

@@ -17,7 +17,7 @@ if (!databaseUrl) {
   );
 }
 
-const pool = new Pool({
+export const pool = new Pool({
   connectionString: databaseUrl ?? "postgresql://cartsnitch:cartsnitch@localhost:5432/cartsnitch",
 });
 

auth/src/index.ts

@@ -1,6 +1,6 @@
 import { createServer } from "node:http";
 import { toNodeHandler } from "better-auth/node";
-import { auth } from "./auth.js";
+import { auth, pool } from "./auth.js";
 
 const port = parseInt(process.env.PORT ?? "3001", 10);
 
@@ -9,8 +9,22 @@ const handler = toNodeHandler(auth);
 const server = createServer(async (req, res) => {
   // Health check
   if (req.url === "/health" && req.method === "GET") {
+    try {
+      const client = await pool.connect();
+      try {
+        await Promise.race([
+          client.query("SELECT 1"),
+          new Promise((_, reject) => setTimeout(() => reject(new Error("DB timeout")), 2000)),
+        ]);
+      } finally {
+        client.release();
+      }
       res.writeHead(200, { "Content-Type": "application/json" });
-    res.end(JSON.stringify({ status: "ok" }));
+      res.end(JSON.stringify({ status: "ok", db: "connected" }));
+    } catch {
+      res.writeHead(503, { "Content-Type": "application/json" });
+      res.end(JSON.stringify({ status: "error", db: "unreachable" }));
+    }
     return;
   }