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name: database-design description: > Database design principles: schema design, indexing strategy, ORM selection, normalization, migrations. Triggers on: 'database', 'cơ sở dữ liệu', 'thiết kế csdl', 'thiết kế database', 'tạo bảng', 'schema', 'index csdl'. allowed-tools: Read, Write, Edit, Glob, Grep metadata: version: "1.0.0"

Database Design

Learn to THINK, not copy SQL patterns.

🎯 Selective Reading Rule

Read ONLY files relevant to the request! Check the content map, find what you need.

FileDescriptionWhen to Read
database-selection.mdPostgreSQL vs Neon vs Turso vs SQLiteChoosing database
orm-selection.mdDrizzle vs Prisma vs KyselyChoosing ORM
schema-design.mdNormalization, PKs, relationshipsDesigning schema
indexing.mdIndex types, composite indexesPerformance tuning
optimization.mdN+1, EXPLAIN ANALYZEQuery optimization
migrations.mdSafe migrations, serverless DBsSchema changes

⚠️ Core Principle

  • ASK user for database preferences when unclear
  • Choose database/ORM based on CONTEXT
  • Don't default to PostgreSQL for everything

Decision Checklist

Before designing schema:

  • [ ] Asked user about database preference?
  • [ ] Chosen database for THIS context?
  • [ ] Considered deployment environment?
  • [ ] Planned index strategy?
  • [ ] Defined relationship types?

Anti-Patterns

❌ Default to PostgreSQL for simple apps (SQLite may suffice) ❌ Skip indexing ❌ Use SELECT * in production ❌ Store JSON when structured data is better ❌ Ignore N+1 queries

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