As part of our mass meta-tag burnination, we're also considering database-schema. It also seems closely related to database-design, which has been burninated and blacklisted just recently. We already have a database tag, which is not up for burnination. I don't think we need very many database-related tags since we already have a site dedicated to this: Database Administrators. I'm also thinking that it may slightly reduce the chances of receiving questions solely about databases (no code), which will get migrated to Database Administrators anyway.