issue DB schema statements each within savepoints

lib/App/Netdisco/DB.pm

@@ -11,7 +11,7 @@ __PACKAGE__->load_namespaces(
 );
 
 our # try to hide from kwalitee
-  $VERSION = 52; # schema version used for upgrades, keep as integer
+  $VERSION = 53; # schema version used for upgrades, keep as integer
 
 use Path::Class;
 use File::ShareDir 'dist_dir';
@@ -20,7 +20,7 @@ our $schema_versions_dir = Path::Class::Dir->new( dist_dir('App-Netdisco') )
   ->subdir('schema_versions')->stringify;
 
 __PACKAGE__->load_components(qw/
-  Schema::Versioned
+  +App::Netdisco::DB::SchemaVersioned
   +App::Netdisco::DB::ExplicitLocking
 /);