diff --git a/graph.go b/graph.go
index 6cc613c..406df30 100644
--- a/graph.go
+++ b/graph.go
@@ -32,12 +32,17 @@ func NewGraphBuilder(mp PagesRepository) (*graphBuilder, error) {
 		return nil, err
 	}
 
-	return &graphBuilder{
+	gb := &graphBuilder{
 		refs:    refs,
 		nodeMap: make(NodeMap),
 		nodes:   nil,
 		edges:   nil,
-	}, nil
+	}
+	gb.nodeMap["Daily_Notes"] = Node{Id: -1}
+	gb.nodeMap["TODO"] = Node{Id: -1}
+	gb.nodeMap["DONE"] = Node{Id: -1}
+	gb.nodeMap["Projects"] = Node{Id: -1}
+	return gb, nil
 }
 
 func (gb *graphBuilder) prepareGraph() error {
@@ -66,7 +71,10 @@ func (gb *graphBuilder) RemoveNodeWithSuffix(suffix string) {
 }
 
 func (gb *graphBuilder) buildFromCenter(name string) error {
-	_ = gb.addNode(name, "#ef2929")
+	id := gb.addNode(name, "#ef2929")
+	if id < 0 {
+		return nil
+	}
 
 	if ref, e := gb.refs[name]; e {
 		for _, item := range ref {
@@ -89,9 +97,9 @@ func prepareEdges(refs Refs, nodeMap NodeMap) []Edge {
 	var edges []Edge
 	edgeSet := make(map[Edge]bool)
 	for key, references := range refs {
-		if to, e := nodeMap[key]; e {
+		if to, e := nodeMap[key]; e && to.Id >= 0 {
 			for _, item := range references {
-				if from, e := nodeMap[item.Name]; e {
+				if from, e := nodeMap[item.Name]; e && from.Id >= 0 {
 					edge := Edge{
 						From: from.Id,
 						To:   to.Id,
@@ -110,6 +118,9 @@ func prepareEdges(refs Refs, nodeMap NodeMap) []Edge {
 func prepareNodes(nodeMap NodeMap, apply func(node Node) Node) []Node {
 	var nodes []Node
 	for _, node := range nodeMap {
+		if node.Id < 0 {
+			continue
+		}
 		nodes = append(nodes, apply(Node{
 			Id:      node.Id,
 			Label:   node.Label,
diff --git a/main.go b/main.go
index bc95e8a..48b84b8 100644
--- a/main.go
+++ b/main.go
@@ -104,7 +104,7 @@ type Node struct {
 	Id      int     `json:"id"`
 	Label   string  `json:"label"`
 	Color   *string `json:"color"`
-	Opacity float64   `json:"opacity"`
+	Opacity float64 `json:"opacity"`
 }
 
 type Edge struct {
@@ -809,6 +809,7 @@ func main() {
 			http.Error(w, err.Error(), 500)
 			return
 		}
+		gb.RemoveNode(name)
 
 		err = gb.buildFromCenter(name)
 		if err != nil {
@@ -819,16 +820,11 @@ func main() {
 		// Keep a copy of the nodes, buildFromCenter appends to the nodeMap
 		var nodes []string
 		for k, _ := range gb.nodeMap {
-			if k == "Daily_Notes" || strings.HasSuffix(k, "Mei_2020") {
-				continue
-			}
 			nodes = append(nodes, k)
 		}
 
-		if name != "Daily_Notes" {
-			for _, node := range nodes {
-				err = gb.buildFromCenter(node)
-			}
+		for _, node := range nodes {
+			err = gb.buildFromCenter(node)
 		}
 
 		err = gb.prepareGraph()