Create difficulty chart component

backend/src/routes.ts

@@ -575,6 +575,18 @@ class Routes {
     }
   }
 
+  public async $getHistoricalDifficulty(req: Request, res: Response) {
+    try {
+      const stats = await BlocksRepository.$getBlocksDifficulty(req.params.interval ?? null);
+      res.header('Pragma', 'public');
+      res.header('Cache-control', 'public');
+      res.setHeader('Expires', new Date(Date.now() + 1000 * 300).toUTCString());
+      res.json(stats);
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
   public async getBlock(req: Request, res: Response) {
     try {
       const result = await bitcoinApi.$getBlock(req.params.hash);