fix(webapp): expire dashboard agent turn runs that are never dequeued

Author: kathiekiwi

apps/webapp/app/services/dashboardAgent.server.ts

@@ -86,10 +86,18 @@ export function isDashboardAgentConfigured(): boolean {
   return Boolean(env.DASHBOARD_AGENT_SECRET_KEY);
 }
 
+// With no agent worker available a turn's run would sit queued indefinitely and
+// could be dequeued much later with a stale token. Expire it instead — the turn
+// is long dead by then on the client.
+const DASHBOARD_AGENT_RUN_TTL = "2m";
+
 // Pins every agent session (and its continuation runs) to a deployed version
 // when DASHBOARD_AGENT_VERSION is set; unset runs on the env's current version.
-export function dashboardAgentTriggerConfig(): { lockToVersion: string } | undefined {
-  return env.DASHBOARD_AGENT_VERSION ? { lockToVersion: env.DASHBOARD_AGENT_VERSION } : undefined;
+export function dashboardAgentTriggerConfig(): { ttl: string; lockToVersion?: string } {
+  return {
+    ttl: DASHBOARD_AGENT_RUN_TTL,
+    ...(env.DASHBOARD_AGENT_VERSION ? { lockToVersion: env.DASHBOARD_AGENT_VERSION } : {}),
+  };
 }
 
 export async function startDashboardAgentSession(params: {

apps/webapp/app/services/realtime/sessionRunManager.server.ts

@@ -310,6 +310,7 @@ async function triggerSessionRun(params: {
       ...(config.maxDuration !== undefined ? { maxDuration: config.maxDuration } : {}),
       ...(config.lockToVersion ? { lockToVersion: config.lockToVersion } : {}),
       ...(config.region ? { region: config.region } : {}),
+      ...(config.ttl !== undefined ? { ttl: config.ttl } : {}),
     },
   };