data-model

Use to design the data model AND generate the actual forward + rollback migrations in one pass — shippable SQL, not a plan. Triggers on "data model for {slug}", "schema for {slug}", "generate migrations for {slug}", "DB design + migration", "/sdd:data-model {slug}", "модель даних для {slug}", "схема для {slug}", "згенеруй міграції". Reads spec.md §5 + sad.md §5 building blocks + the §6 sequence diagrams, then writes docs/features/{slug}/data-model.md plus paired *.up.sql / *.down.sql migrations STAGED under docs/features/{slug}/migrations/ (NOT the live migrations/ tree — implement promotes them when the feature is actually built) and an audit report. Greenfield-first; brownfield delta via --mode brownfield; drift-only via --drift-only. Hard-refuses if spec.md or sad.md is missing. Stack-agnostic: detects and FOLLOWS the repo's DB + migration conventions and domain layer — it imposes no DB philosophy and writes no rules file.