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database-schema-designer

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Designs relational and document database schemas from requirements or an existing app - tables and collections, keys, relationships, constraints, indexes driven by real query patterns, ERDs, and reversible migration scripts - with PostgreSQL (including Supabase) as the default and MySQL, SQLite, and MongoDB supported. Use when the user wants to model data for a new app or feature, review or fix an existing schema, choose keys or indexes, plan multi-tenancy, normalize or denormalize, or write CREATE TABLE statements or migrations, even if they just describe their app and ask "how should I store this". For moving data between database providers, use database-migrator.

database-schema-designer/SKILL.md

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# Database Schema Designer

Design a schema that enforces the data's rules in the database and makes the app's real queries fast.

## Workflow

1. **Collect requirements.** Get from the conversation or codebase, and ask only for what blocks the design:
   - Engine and version (default: PostgreSQL 18; check `docker-compose.yml`, ORM config, or Supabase project if present)
   - Entities and how they relate, in plain language
   - The 5-10 most frequent or most important queries, including filters and sort order
   - Volume and growth (rows per table per year), read/write mix
   - Tenancy (single app, multi-tenant by organization), retention, audit, and compliance needs (PII, deletion requests)
   - ORM or migration tool in use (Prisma, Drizzle, Rails, Django, Alembic, Supabase migrations, plain SQL)
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