feat: recover stale running agent runs

scripts/check-agent-run-worker.mjs

@@ -108,6 +108,15 @@ async function readQueueSummary() {
       ? null
       : Number(lagRows[0].oldest_updated_at);
 
+    const [runningRows] = await conn.query(
+      `SELECT MIN(started_at) AS oldest_started_at
+       FROM h5_agent_runs
+       WHERE status = 'running'`,
+    );
+    const oldestRunningStartedAt = runningRows[0]?.oldest_started_at == null
+      ? null
+      : Number(runningRows[0].oldest_started_at);
+
     const [failedRows] = await conn.query(
       `SELECT id, request_id, error_message, updated_at
        FROM h5_agent_runs
@@ -120,6 +129,8 @@ async function readQueueSummary() {
       statusCounts,
       oldestPendingUpdatedAt: oldestUpdatedAt,
       oldestPendingAgeMs: oldestUpdatedAt == null ? 0 : Math.max(0, Date.now() - oldestUpdatedAt),
+      oldestRunningStartedAt,
+      oldestRunningAgeMs: oldestRunningStartedAt == null ? 0 : Math.max(0, Date.now() - oldestRunningStartedAt),
       latestFailedRun: failedRows[0] ? {
         id: failedRows[0].id,
         requestId: failedRows[0].request_id,