Retrieve acceleration request time and first seen time

frontend/src/app/interfaces/electrs.interface.ts

@@ -21,6 +21,7 @@ export interface Transaction {
   cpfpChecked?: boolean;
   acceleration?: boolean;
   acceleratedBy?: number[];
+  acceleratedAt?: number;
   deleteAfter?: number;
   _unblinded?: any;
   _deduced?: boolean;

frontend/src/app/interfaces/node-api.interface.ts

@@ -30,6 +30,7 @@ export interface CpfpInfo {
   adjustedVsize?: number;
   acceleration?: boolean;
   acceleratedBy?: number[];
+  acceleratedAt?: number;
 }
 
 export interface RbfInfo {