diff --git a/scripts/scheduler.ts b/scripts/scheduler.ts
index 5f796b3..7e06c90 100644
--- a/scripts/scheduler.ts
+++ b/scripts/scheduler.ts
@@ -731,6 +731,7 @@ async function main(): Promise<void> {
 
   validateEnvironment();
   ensureLogsDir();
+  fs.writeFileSync(path.join(LOGS_DIR, 'scheduler.heartbeat'), new Date().toISOString());
 
   // Crash recovery: mark orphaned jobs as failed
   await recoverFromCrash();