adding

LCU.API.Internal.Document/OwnerNumberMigration/IAttributeMigration.cs

@@ -0,0 +1,15 @@
+using OwnerNumberMigration.ValueParsing;
+
+namespace OwnerNumberMigration;
+
+public delegate IAttributeMigration AttributeMigrationFactory<in T>
+(
+    string attributeName,
+    IValueParsingStrategy<T> valueParsingStrategy,
+    string destinationProperty
+);
+
+public interface IAttributeMigration
+{
+    Task Migrate(CancellationToken cancellationToken);
+}