Issue #3145412 by pavnish, cburschka, amateescu: Connection::__destruct()...

          // We can prune the database file if it doesn't have any tables.

          if ($count == 0 && $this->connectionOptions['database'] != ':memory:' && file_exists($this->connectionOptions['database'] . '-' . $prefix)) {

            // Detaching the database fails at this point, but no other queries

            // are executed after the connection is destructed so we can simply

            // remove the database file.

            // Detach the database.

            $this->query('DETACH DATABASE :schema', [':schema' => $prefix]);

            // Destroy the database file.

            unlink($this->connectionOptions['database'] . '-' . $prefix);

          }

        }