drizzle-schema

Builds the migration layer of a use case (UC-XXX) with Drizzle over PostgreSQL: edits the pg-core schema file that drizzle.config.ts names and generates the SQL migration with drizzle-kit, never by hand: a complete table, with every attribute and constraint of the entity model, for each entity the use case needs that has no table yet, and a change only where an existing table lags behind the entity model. Marks a CHECK or unique index that enforces a business rule with // UC-XXX BR-YYY in the schema file. Normally run by /use-case-implement as the first layer; can be run directly, with a use case or for the whole entity model. Use when the user asks to "create a migration", "generate SQL", "update the schema", "add a column", "create the tables for UC-001", or mentions Drizzle, drizzle-kit, pg-core, schema.ts, or database versioning in a project that combines layer plugins. Test data belongs to the test skills.