HSB-445 feature: storing user last login timestamp (#4074)

* feat: lastLoggedOn added in schema and service function

* feat: add lastLoggedOn logic for magic link

* test: update test cases

* feat: add lastLoggedOn in gql model

* fix: nullable allowed in model attribute

* fix: resolve feedback

* feat: user last login interceptor added

packages/hoppscotch-backend/src/interceptors/user-last-login.interceptor.ts

@@ -0,0 +1,26 @@
+import {
+  Injectable,
+  NestInterceptor,
+  ExecutionContext,
+  CallHandler,
+} from '@nestjs/common';
+import { Observable } from 'rxjs';
+import { tap } from 'rxjs/operators';
+import { AuthUser } from 'src/types/AuthUser';
+import { UserService } from 'src/user/user.service';
+
+@Injectable()
+export class UserLastLoginInterceptor implements NestInterceptor {
+  constructor(private userService: UserService) {}
+
+  intercept(context: ExecutionContext, next: CallHandler): Observable<any> {
+    const user: AuthUser = context.switchToHttp().getRequest().user;
+
+    const now = Date.now();
+    return next.handle().pipe(
+      tap(() => {
+        this.userService.updateUserLastLoggedOn(user.uid);
+      }),
+    );
+  }
+}