public SetupMigration(SourceMigration sourceMigration, Func <SqlConnection, Task <TArrangement> > fn)
{
_sourceMigration = sourceMigration;
_fn = fn;
}
public TargetMigration(SourceMigration sourceMigration, Func <SqlConnection, Task <TArrangement> > fn, string migrationName)
{
_sourceMigration = sourceMigration;
_fn = fn;
_migrationName = migrationName;
}