Enlarge Legacy file description field to nvarchar max

Feat: Enlarge Legacy file description field to nvarchar max

Author: akfakmot

KVA/Migration.Tool.Source/FieldConstants.cs

@@ -1,5 +1,9 @@
 namespace Migration.Tool.Source;
 public static class FieldConstants
 {
-    public const int MaxColumnSize = 1000;
+    /// <summary>
+    /// Value for <see cref="Kentico.Xperience.UMT.Model.FormField.ColumnSize"/> equivalent to NVARCHAR(MAX) in database. 
+    /// Works only if <see cref="Kentico.Xperience.UMT.Model.FormField.ColumnType"/> is "longtext"
+    /// </summary>
+    public const int LongTextMaxColumnSize = 0;
 }

KVA/Migration.Tool.Source/Services/AssetFacade.cs

@@ -339,11 +339,11 @@ private void AssertSuccess(IImportResult importResult, IUmtModel model)
     internal static readonly FormField LegacyMediaFileDescriptionField = new()
     {
         Column = "LegacyMediaFileDescription",
-        ColumnType = "text",
+        ColumnType = "longtext",
         AllowEmpty = true,
         Visible = true,
         Enabled = true,
-        ColumnSize = FieldConstants.MaxColumnSize,
+        ColumnSize = FieldConstants.LongTextMaxColumnSize,
         Guid = new Guid("98F43915-B540-478D-80A4-E294E631C431"),
         Properties = new FormFieldProperties { FieldCaption = "Description", },
         Settings = new FormFieldSettings { ControlName = "Kentico.Administration.TextArea" }