fix : correct api healthz

backend/discord.ts

@@ -10,7 +10,7 @@ import {
   getLatestLunarisVersion,
   processCatalogSync,
 } from "@/lib/catalog/sync";
-import { closeRedisClient } from "@/lib/redis/client";
+import { closeRedisClient, discordWorkerHeartbeatKey, getRedisClient } from "@/lib/redis/client";
 
 const RETRY_DELAYS_MS = [0, 30_000, 120_000, 600_000, 1_800_000] as const;
 
@@ -50,6 +50,17 @@ const client = new Client({
     GatewayIntentBits.MessageContent,
   ],
 });
+let heartbeatTimer: ReturnType<typeof setInterval> | undefined;
+
+async function writeHeartbeat(): Promise<void> {
+  if (!client.isReady()) return;
+  try {
+    const redis = await getRedisClient();
+    await redis.set(discordWorkerHeartbeatKey(), "1", "EX", 45);
+  } catch (cause) {
+    log("heartbeat_failed", { error: cause instanceof Error ? cause.message : String(cause) });
+  }
+}
 
 let pendingMessageUrl: string | null = null;
 let runner: Promise<void> | null = null;
@@ -168,11 +179,14 @@ try {
   await Promise.race([ready, stopped]);
   if (!shutdown.signal.aborted) {
     log("discord_ready", { userId: client.user?.id, channelId });
+    await writeHeartbeat();
+    heartbeatTimer = setInterval(() => { void writeHeartbeat(); }, 15_000);
     await notify("worker ready", { userId: client.user?.id, channelId });
     await stopped;
   }
 } finally {
   shutdown.abort();
+  if (heartbeatTimer) clearInterval(heartbeatTimer);
   client.destroy();
   await Promise.resolve(runner).catch(() => undefined);
   await Promise.all([closeDb(), closeRedisClient()]);