fix: run initial delete only when target version is unset (#103)

Use CurrentVersion < 0 instead of <= 1 so WHEN NOT MATCHED BY SOURCE
(initial delete) runs only for tables that have never been synced,
not for version 0 or 1.

Author: devlead

src/SqlBulkSyncFunction/Helpers/SqlStatementExtensions.cs

@@ -118,7 +118,7 @@ THEN UPDATE
                     : string.Empty
                 ),
             (
-                (tableSchema.TargetVersion.CurrentVersion <= 1)
+                (tableSchema.TargetVersion.CurrentVersion < 0)
                     ? """
 
                     WHEN NOT MATCHED BY SOURCE
@@ -250,7 +250,7 @@ public static string GetDeletedAtSourceSelectStatement(this TableSchema tableSch
             .Where(column => column.IsPrimary)
             .ToArray();
 
-        if (tableSchema.TargetVersion.CurrentVersion <= 1)
+        if (tableSchema.TargetVersion.CurrentVersion < 0)
         {
             return string.Format(
                 """