Refaktorisierung des Flag-Enums: Flag auf nullable gesetzt, HasFlag-Methode für Nullable-Prüfung aktualisiert, Null-Flag entfernt, SecurityBreachOrDataIntegrity für überlappende Probleme hinzugefügt.

DigitalData.Core.Application/Flag.cs

@@ -14,6 +14,19 @@
         /// <summary>
         /// Indicates a security breach or vulnerability has been detected during the service operation.
         /// </summary>
-        SecurityBreach
+        SecurityBreach,
+
+        /// <summary>
+        /// Indicates a potential issue with data integrity during the service operation.
+        /// This flag is used when data may have been altered, corrupted, or is otherwise unreliable,
+        /// which could impact the accuracy or trustworthiness of the operation's results.
+        /// </summary>
+        DataIntegrityIssue,
+
+        /// <summary>
+        /// Indicates that either a security breach, a data integrity issue, or both have been detected during the service operation.
+        /// This flag is used when one or both types of issues are present, requiring heightened attention to both security and data accuracy.
+        /// </summary>
+        SecurityBreachOrDataIntegrity
     }
 }

DigitalData.Core.Application/ServiceMessage.cs

@@ -51,7 +51,7 @@ namespace DigitalData.Core.Application
         /// This flag helps in categorizing the state of the operation more granularly.
         /// </summary>
         [JsonIgnore]
-        public Enum Flag { get; set; } = Application.Flag.Null;
+        public Enum? Flag { get; set; } = default;
 
         /// <summary>
         /// Checks if the current service message's flag matches the specified flag.
@@ -59,7 +59,7 @@ namespace DigitalData.Core.Application
         /// </summary>
         /// <param name="flag">The flag to check against the current service message's flag.</param>
         /// <returns>true if the flags match; otherwise, false.</returns>
-        public bool HasFlag(Enum flag) => Flag.ToString() == flag.ToString();
+        public bool HasFlag(Enum flag) => Flag?.ToString() == flag.ToString();
 
         /// <summary>
         /// [Obsolete("Deprecated: Use ClientMessages instead.")]

DigitalData.Core.Contracts/Application/IServiceMessage.cs

@@ -19,7 +19,7 @@ namespace DigitalData.Core.Contracts.Application
         /// This flag helps in categorizing the state of the operation more granularly.
         /// </summary>
         [JsonIgnore]
-        Enum Flag { get; set; }
+        Enum? Flag { get; set; }
 
         /// <summary>
         /// Checks if the current service message's flag matches the specified flag.