feat(ops): expose liveness and readiness probes

app/api/health/route.ts

@@ -0,0 +1,46 @@
+import { sql } from "drizzle-orm";
+
+import { getDb } from "@/db/client";
+import { checkReadiness } from "@/lib/health/readiness";
+import { getRedisClient } from "@/lib/redis/client";
+
+const NO_STORE_HEADERS = { "Cache-Control": "no-store" };
+
+export async function GET(request: Request) {
+  const deploymentId = process.env.NEXT_DEPLOYMENT_ID || "unknown";
+  const readiness = new URL(request.url).searchParams.get("ready") === "1";
+  if (!readiness) {
+    return Response.json(
+      { status: "ok", deploymentId },
+      { headers: NO_STORE_HEADERS },
+    );
+  }
+
+  if (process.env.BUZZ_DEMO_MODE === "true") {
+    return Response.json(
+      { status: "ready", deploymentId, checks: { demo: "ok" } },
+      { headers: NO_STORE_HEADERS },
+    );
+  }
+
+  const timeout = Number(process.env.HEALTHCHECK_TIMEOUT_MS || 2_500);
+  const result = await checkReadiness(
+    {
+      database: async () => {
+        await getDb().execute(sql`select 1`);
+      },
+      redis: async () => {
+        const client = await getRedisClient();
+        await client.ping();
+      },
+    },
+    Number.isFinite(timeout) ? timeout : 2_500,
+  );
+  return Response.json(
+    { ...result, deploymentId },
+    {
+      status: result.status === "ready" ? 200 : 503,
+      headers: NO_STORE_HEADERS,
+    },
+  );
+}