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53 lines
1.5 KiB
Markdown
53 lines
1.5 KiB
Markdown
---
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name: database-design
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description: Database design principles and decision-making. Schema design, indexing strategy, ORM selection, serverless databases.
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allowed-tools: Read, Write, Edit, Glob, Grep
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---
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# Database Design
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> **Learn to THINK, not copy SQL patterns.**
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## 🎯 Selective Reading Rule
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**Read ONLY files relevant to the request!** Check the content map, find what you need.
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| File | Description | When to Read |
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|------|-------------|--------------|
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| `database-selection.md` | PostgreSQL vs Neon vs Turso vs SQLite | Choosing database |
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| `orm-selection.md` | Drizzle vs Prisma vs Kysely | Choosing ORM |
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| `schema-design.md` | Normalization, PKs, relationships | Designing schema |
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| `indexing.md` | Index types, composite indexes | Performance tuning |
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| `optimization.md` | N+1, EXPLAIN ANALYZE | Query optimization |
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| `migrations.md` | Safe migrations, serverless DBs | Schema changes |
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---
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## ⚠️ Core Principle
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- ASK user for database preferences when unclear
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- Choose database/ORM based on CONTEXT
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- Don't default to PostgreSQL for everything
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---
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## Decision Checklist
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Before designing schema:
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- [ ] Asked user about database preference?
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- [ ] Chosen database for THIS context?
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- [ ] Considered deployment environment?
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- [ ] Planned index strategy?
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- [ ] Defined relationship types?
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---
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## Anti-Patterns
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❌ Default to PostgreSQL for simple apps (SQLite may suffice)
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❌ Skip indexing
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❌ Use SELECT * in production
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❌ Store JSON when structured data is better
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❌ Ignore N+1 queries
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