Fixed user last login query

- Added frontend logic for first login
- Added table index for user_logins table
- Updated statistics rest endpoint

frontend/src/app/adminui/adminui.component.ts

@@ -1,5 +1,5 @@
 import {Component, ElementRef, ViewChild} from '@angular/core';
-import {DatePipe, DecimalPipe, NgForOf} from "@angular/common";
+import {DatePipe, DecimalPipe, NgForOf, NgIf} from "@angular/common";
 import axios from "axios";
 import {firstValueFrom} from "rxjs";
 import {DevelopmentStore} from "../../store/DevelopmentStore";
@@ -22,7 +22,8 @@ import {EdituserComponent} from "./edituser/edituser.component";
     DurationPipe,
     RelativeTimePipe,
     FormsModule,
-    EdituserComponent
+    EdituserComponent,
+    NgIf
   ],
   templateUrl: './adminui.component.html',
   styleUrl: './adminui.component.scss'
@@ -35,7 +36,7 @@ export class AdminuiComponent {
   expiredFileUploads: any[] = [];
   totalFileSizeOnDisk: number = 0;
   totalFileDownloads = 0;
-  statistics: any = {};
+  statistics: any = "";
   username: string = "";
 
   constructor(private developmentStore: DevelopmentStore, private authStore: AuthStore, private router: Router) {