feat: implementa campo Data_Hash per ottimizzazione trasferimenti

- Aggiunge colonna "Hash Dati" nella tabella delle associazioni con visualizzazione troncata
- Implementa generazione hash SHA256 che include signature dei mapping per rilevare modifiche configurazione
- Modifica logica trasferimento per saltare record con hash identico (ottimizzazione prestazioni)
- Corregge UpdateAssociationAsync per persistere correttamente Data_Hash e LastVerifiedAt nel database
- Aggiorna hash solo in caso di trasferimento riuscito, mantenendo coerenza tra Salesforce e database locale
- Migliora logging per debug del sistema di hash e associazioni

Risolve il problema dei trasferimenti continui quando i mapping cambiano e ottimizza le prestazioni saltando record non modificati.

CredentialManager/Services/KeyAssociationService.cs

@@ -31,6 +31,7 @@ public class KeyAssociationService : IKeyAssociationService
         var sourceKeyField = association.SourceKeyField;
         var destinationKeyField = association.DestinationKeyField;
         var additionalInfo = association.AdditionalInfo;
+        var dataHash = association.Data_Hash;
         var currentTime = DateTime.UtcNow;
 
         try
@@ -47,12 +48,13 @@ public class KeyAssociationService : IKeyAssociationService
                     DestinationKeyField = {2}, 
                     UpdatedAt = {3}, 
                     LastVerifiedAt = {4}, 
-                    AdditionalInfo = {5}
-                WHERE KeyValue = {6} 
-                    AND DestinationEntity = {7} 
-                    AND RestCredentialName = {8} 
+                    AdditionalInfo = {5},
+                    Data_Hash = {6}
+                WHERE KeyValue = {7} 
+                    AND DestinationEntity = {8} 
+                    AND RestCredentialName = {9} 
                     AND IsActive = 1",
-                destinationId, sourceKeyField, destinationKeyField, currentTime, currentTime, additionalInfo ?? (object)DBNull.Value,
+                destinationId, sourceKeyField, destinationKeyField, currentTime, currentTime, additionalInfo ?? (object)DBNull.Value, dataHash ?? (object)DBNull.Value,
                 keyValue, destinationEntity, restCredentialName);
 
             if (rowsAffected > 0)
@@ -92,6 +94,7 @@ public class KeyAssociationService : IKeyAssociationService
                     CreatedAt = currentTime,
                     LastVerifiedAt = currentTime,
                     AdditionalInfo = additionalInfo,
+                    Data_Hash = dataHash,
                     IsActive = true
                 };
                 
@@ -125,6 +128,7 @@ public class KeyAssociationService : IKeyAssociationService
                     existing.UpdatedAt = currentTime;
                     existing.LastVerifiedAt = currentTime;
                     existing.AdditionalInfo = additionalInfo;
+                    existing.Data_Hash = dataHash;
                     
                     UpdateSourcesInfo(existing, association);
                     
@@ -162,6 +166,7 @@ public class KeyAssociationService : IKeyAssociationService
         var sourceKeyField = association.SourceKeyField;
         var destinationKeyField = association.DestinationKeyField;
         var additionalInfo = association.AdditionalInfo;
+        var dataHash = association.Data_Hash;
         var currentTime = DateTime.UtcNow;
 
         // Crea un nuovo DbContext per questa operazione parallela
@@ -185,12 +190,13 @@ public class KeyAssociationService : IKeyAssociationService
                     DestinationKeyField = {2}, 
                     UpdatedAt = {3}, 
                     LastVerifiedAt = {4}, 
-                    AdditionalInfo = {5}
-                WHERE KeyValue = {6} 
-                    AND DestinationEntity = {7} 
-                    AND RestCredentialName = {8} 
+                    AdditionalInfo = {5},
+                    Data_Hash = {6}
+                WHERE KeyValue = {7} 
+                    AND DestinationEntity = {8} 
+                    AND RestCredentialName = {9} 
                     AND IsActive = 1",
-                destinationId, sourceKeyField, destinationKeyField, currentTime, currentTime, additionalInfo ?? (object)DBNull.Value,
+                destinationId, sourceKeyField, destinationKeyField, currentTime, currentTime, additionalInfo ?? (object)DBNull.Value, dataHash ?? (object)DBNull.Value,
                 keyValue, destinationEntity, restCredentialName);
 
             if (rowsAffected > 0)
@@ -230,6 +236,7 @@ public class KeyAssociationService : IKeyAssociationService
                     CreatedAt = currentTime,
                     LastVerifiedAt = currentTime,
                     AdditionalInfo = additionalInfo,
+                    Data_Hash = dataHash,
                     IsActive = true
                 };
                 
@@ -549,9 +556,11 @@ public class KeyAssociationService : IKeyAssociationService
             existing.DestinationId = association.DestinationId;
             existing.RestCredentialName = association.RestCredentialName;
             existing.UpdatedAt = DateTime.UtcNow;
+            existing.LastVerifiedAt = association.LastVerifiedAt;
             existing.AdditionalInfo = association.AdditionalInfo;
             existing.SourcesInfo = association.SourcesInfo;
             existing.IsActive = association.IsActive;
+            existing.Data_Hash = association.Data_Hash;
 
             _context.KeyAssociations.Update(existing);
             await _context.SaveChangesAsync();