added invariant exports to get methods.

Helper/ConfigHelper.cs

@@ -24,7 +24,8 @@ namespace CarCareTracker.Helper
         bool GetServerEnableShopSupplies();
         string GetServerPostgresConnection();
         string GetAllowedFileUploadExtensions();
-        public bool DeleteUserConfig(int userId);
+        bool DeleteUserConfig(int userId);
+        bool GetInvariantApi();
     }
     public class ConfigHelper : IConfigHelper
     {
@@ -51,6 +52,10 @@ namespace CarCareTracker.Helper
         {
             return CheckBool(CheckString("LUBELOGGER_CUSTOM_WIDGETS"));
         }
+        public bool GetInvariantApi()
+        {
+            return CheckBool(CheckString("LUBELOGGER_INVARIANT_API"));
+        }
         public string GetMOTD()
         {
             var motd = CheckString("LUBELOGGER_MOTD");

Helper/StaticHelper.cs

@@ -1,6 +1,7 @@
 using CarCareTracker.Models;
 using CsvHelper;
 using System.Globalization;
+using System.Text.Json;
 
 namespace CarCareTracker.Helper
 {
@@ -622,6 +623,12 @@ namespace CarCareTracker.Helper
                 return string.IsNullOrWhiteSpace(decorations) ? input.ToString("C2") : $"{input.ToString("C2")}{decorations}";
             }
         }
+        public static JsonSerializerOptions GetInvariantOption()
+        {
+            var serializerOption = new JsonSerializerOptions();
+            serializerOption.Converters.Add(new InvariantConverter());
+            return serializerOption;
+        }
         public static void WriteGasRecordExportModel(CsvWriter _csv, IEnumerable<GasRecordExportModel> genericRecords)
         {
             var extraHeaders = genericRecords.SelectMany(x => x.ExtraFields).Select(y => y.Name).Distinct();