Moved to uv from poetry

Updated ruff and mypy, accepted all changes
Central exception management and injected the Session.
This removed a lot of duplicated boilerplate code.
Added health check
Updated to Angular 21

overlord/src/app/purchase-entries/purchase-entries.component.ts

@@ -52,7 +52,7 @@ export class PurchaseEntriesComponent implements OnInit {
   displayedColumns = ['date', 'supplier', 'product', 'quantity', 'rate', 'tax', 'discount', 'amount'];
 
   @HostListener('window:keydown.f2', ['$event'])
-  focusDate(event: KeyboardEvent) {
+  focusDate(event: Event) {
     event.preventDefault();
     this.startDate.nativeElement.focus();
     this.startDate.nativeElement.select();

overlord/src/app/purchase-entries/purchase-entries.service.ts

@@ -1,4 +1,4 @@
-import { HttpClient } from '@angular/common/http';
+import { HttpClient, HttpParams } from '@angular/common/http';
 import { inject, Injectable } from '@angular/core';
 import { Observable } from 'rxjs/internal/Observable';
 import { catchError } from 'rxjs/operators';
@@ -17,10 +17,15 @@ export class PurchaseEntriesService {
   private log = inject(ErrorLoggerService);
 
   list(startDate: string | null, finishDate: string | null): Observable<PurchaseEntries> {
-    const startDateWithSlash = startDate ? `/${startDate}` : '';
-    const finishDateWithSlash = finishDate ? `/${finishDate}` : '';
+    const options = { params: new HttpParams() };
+    if (startDate !== null) {
+      options.params = options.params.set('s', startDate);
+    }
+    if (finishDate !== null) {
+      options.params = options.params.set('f', finishDate);
+    }
     return this.http
-      .get<PurchaseEntries>(`${url}${startDateWithSlash}${finishDateWithSlash}`)
+      .get<PurchaseEntries>(url, options)
       .pipe(catchError(this.log.handleError(serviceName, 'list'))) as Observable<PurchaseEntries>;
   }
 }