Database Schema Design Use this skill when the main job is choosing and evolving the storage model , not dumping generic SQL or ORM snippets. is the backend storage-design anchor for: - choosing between relational-first, document-heavy, and hybrid models - turning domain entities into tables, collections, ownership boundaries, and lifecycle rules - justifying constraints, indexes, tenant scope, history/audit structures, and deletion/retention behavior - planning staged schema evolution so migrations, backfills, and cleanup are believable - handing downstream teams one compact storage-design p…