Reintroduced number ids, since it is actually useful

src/editor/js/structures/graph/link.ts

@@ -96,8 +96,8 @@ export class Link extends GraphElement {
     public static parse(raw: any): Link {
         const link: Link = new Link();
 
-        link.sourceId = raw.source;
-        link.targetId = raw.target;
+        link.sourceId = Number(raw.source);
+        link.targetId = Number(raw.target);
 
         return link;
     }

src/editor/js/structures/graph/node.ts

@@ -94,7 +94,7 @@ export class Node extends GraphElement {
     public static parse(raw: any): Node {
         const node: Node = new Node();
 
-        node.id = raw.id;
+        node.id = Number(raw.id);
         node.label = raw.name;
         node.description = raw.description;
         node.type = NodeType.parse(raw.type);