Update backend/src/api/mempool.ts

Co-authored-by: mononaut <83316221+mononaut@users.noreply.github.com>

backend/src/api/mempool.ts

@@ -156,6 +156,7 @@ class Mempool {
       }
     };
 
+    let intervalTimer = Date.now();
     for (const txid of transactions) {
       if (!this.mempoolCache[txid]) {
         try {