thread must die if g_killed set;

src/fne/network/TrafficNetwork.MetricsLogging.cpp

@@ -814,6 +814,11 @@ namespace {
             size_t queueDepth = state->queue.pendingCount.load(std::memory_order_acquire);
             if (queueDepth == 0U) {
                 std::this_thread::sleep_for(std::chrono::milliseconds(SQLITE_BATCH_WAIT_MS));
+                if (g_killed) {
+                    delete th;
+                    return nullptr;
+                }
+
                 continue;
             }