Tidy acceleration dashboard, add missing fields

frontend/src/app/components/block-fee-rates-graph/block-fee-rates-graph.component.ts

@@ -41,6 +41,7 @@ export class BlockFeeRatesGraphComponent implements OnInit {
     renderer: 'svg',
   };
 
+  hrStatsObservable$: Observable<any>;
   statsObservable$: Observable<any>;
   isLoading = true;
   formatNumber = formatNumber;
@@ -85,6 +86,19 @@ export class BlockFeeRatesGraphComponent implements OnInit {
         });
     }
 
+    this.hrStatsObservable$ = combineLatest([
+      this.apiService.getHistoricalBlockFeeRates$('24h'),
+      this.stateService.rateUnits$
+    ]).pipe(
+      map(([response, rateUnits]) => {
+        return {
+          blockCount: parseInt(response.headers.get('x-total-count'), 10),
+          avgMedianRate: response.body.length ? response.body.reduce((acc, rate) => acc + rate.avgFee_50, 0) / response.body.length : 0,
+        };
+      }),
+      share(),
+    );
+
     this.statsObservable$ = combineLatest([
         this.widget ? of(this.miningWindowPreference) : this.radioGroupForm.get('dateSpan').valueChanges.pipe(startWith(this.radioGroupForm.controls.dateSpan.value)),
         this.stateService.rateUnits$