static Cache<MultiMap<S, WebNode>> cachedNodeIndex2_cache = new Cache(f cachedNodeIndex2_make);
static bool cachedNodeIndex_autoMake = true;
sbool cachedNodeIndex2_monitorCircleEditor;
static bool cachedNodeIndex2_first = true;
static FileStatus cachedNodeIndex2_status;

please include function postSoftwareMadeWeb.

static MultiMap<S, WebNode> cachedNodeIndex2() {
  if (cachedNodeIndex2_first) {
    cachedNodeIndex2_first = false;
    onWebsChanged(f cachedNodeIndex2_clear);
    onTransientWebAdded_do(f cachedNodeIndex2_onNewWeb);
    onTransientWebRemoved_do(f cachedNodeIndex2_onWebRemoved);
    setAdd(postSoftwareMadeWeb_onNewWeb, f cachedNodeIndex2_onNewWeb);
  }
  
  if (cachedNodeIndex2_monitorCircleEditor) {
    FileStatus status = conceptsFileStatus(circlesEditorDBID());
    if (neq(cachedNodeIndex2_status, status)) {
      cachedNodeIndex2_status = status;
      cachedNodeIndex2_cache.clear();
    }
  }
  
  ret cachedNodeIndex2_cache!;
}

static void cachedNodeIndex2_clear() {
  cachedNodeIndex2_cache.clear();
}

sbool cachedNodeIndex2_onNewWeb(Web web, O[] params) {
  ret cachedNodeIndex2_onNewWeb(web);
}

sbool cachedNodeIndex2_onNewWeb(Web web) {
  if (!cachedNodeIndex_autoMake) false;
  lock cachedNodeIndex2_cache.lock;
  //print("Incremental update");
  ai_addWebToIndex(cachedNodeIndex2_cache!, web);
  cachedNodeIndex2_cache.changeCount++;
  false; // don't trigger full update
}

svoid cachedNodeIndex2_onWebRemoved(Web web) {
  if (!cachedNodeIndex_autoMake) ret;
  lock cachedNodeIndex2_cache.lock;
  print("Incremental removal");
  ai_removeWebFromIndex(cachedNodeIndex2_cache!, web);
  cachedNodeIndex2_cache.changeCount++;
}

static long cachedNodeIndex_changeCount() {
  ret cachedNodeIndex2_cache.changeCount;
}

static MultiMap<S, WebNode> cachedNodeIndex2_make() {
  if (cachedNodeIndex_autoMake) {
    print("Making index");
    ret dwlw_fullNodeIndex_ci();
  } else {
    //print("Skipping making index");
    ret ai_emptyWebIndex();
  }
}

Began life as a copy of #1010574