peformance verbesserungen

timetracker.Client/Services/ClientHolidayService.cs

@@ -6,6 +6,7 @@ namespace timetracker.Client.Services;
 public class ClientHolidayService : IHolidayService
 {
     private readonly HttpClient _http;
+    private readonly Dictionary<(int Year, string StateCode), List<PublicHoliday>> _holidayCache = new();
 
     public ClientHolidayService(HttpClient http)
     {
@@ -14,12 +15,21 @@ public class ClientHolidayService : IHolidayService
 
     public async Task<List<PublicHoliday>> GetHolidaysAsync(int year, string? stateCode = null)
     {
+        var sc = stateCode ?? "";
+        var key = (year, sc);
+        if (_holidayCache.TryGetValue(key, out var cached))
+        {
+            return cached;
+        }
+
         var url = $"api/holidays?year={year}";
         if (!string.IsNullOrEmpty(stateCode))
         {
             url += $"&stateCode={stateCode}";
         }
-        return await _http.GetFromJsonAsync<List<PublicHoliday>>(url) ?? [];
+        var result = await _http.GetFromJsonAsync<List<PublicHoliday>>(url) ?? [];
+        _holidayCache[key] = result;
+        return result;
     }
 
     public async Task<(bool Success, string Message)> FetchAndStoreAsync(int year)
@@ -30,6 +40,12 @@ public class ClientHolidayService : IHolidayService
             var result = await response.Content.ReadFromJsonAsync<FetchResponse>();
             if (result != null)
             {
+                // Invalidate the cache for this year
+                var keysToRemove = _holidayCache.Keys.Where(k => k.Year == year).ToList();
+                foreach (var k in keysToRemove)
+                {
+                    _holidayCache.Remove(k);
+                }
                 return (result.Success, result.Message);
             }
         }
@@ -39,6 +55,8 @@ public class ClientHolidayService : IHolidayService
     public async Task DeleteAsync(int id)
     {
         await _http.DeleteAsync($"api/holidays/{id}");
+        // Invalidate all caches since we deleted a holiday
+        _holidayCache.Clear();
     }
 
     private class FetchResponse