more sonar cloud sugestions

Signed-off-by: Neil South <[email protected]>

Author: neildsouth

src/Api/Hl7ApplicationConfigEntity.cs

@@ -116,7 +116,7 @@ public override string ToString()
     }
 
     //string key, string value
-    public class StringKeyValuePair : IKeyValuePair<string, string>
+    public sealed class StringKeyValuePair : IKeyValuePair<string, string>
     {
         [Key]
         public string Key { get; set; } = string.Empty;
@@ -138,7 +138,7 @@ public static List<StringKeyValuePair> FromDictionary(Dictionary<string, string>
 
     }
 
-    public class DataKeyValuePair : IKeyValuePair<string, DataLinkType>
+    public sealed class DataKeyValuePair : IKeyValuePair<string, DataLinkType>
     {
         [Key]
         public string Key { get; set; } = string.Empty;

src/InformaticsGateway/Services/Common/InputHL7DataPlugInEngine.cs

@@ -54,7 +54,6 @@ public async Task<Tuple<Message, FileStorageMetadata>> ExecutePlugInsAsync(Messa
 
             foreach (var plugin in _plugsins)
             {
-                var nm = plugin.ToString();
                 if (configItem is not null && configItem.PlugInAssemblies.Exists(a => a.StartsWith(plugin.ToString()!)))
                 {
                     _logger.ExecutingInputDataPlugIn(plugin.Name);

src/InformaticsGateway/Services/HealthLevel7/MllpService.cs

@@ -62,7 +62,7 @@ internal sealed class MllpService : IMllpService, IHostedService, IDisposable, I
         private readonly IMllpExtract _mIIpExtract;
         private readonly IInputHL7DataPlugInEngine _inputHL7DataPlugInEngine;
         private readonly IHl7ApplicationConfigRepository _hl7ApplicationConfigRepository;
-        private DateTime _lastConfigRead = new DateTime(2000, 1, 1);
+        private DateTime _lastConfigRead = new(2000, 1, 1, 0, 0, 0, DateTimeKind.Utc);
 
         public int ActiveConnections
         {