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database-design

Skill130 starsChanged 10 months agoMITView on GitHub

Database design principles and decision-making. Schema design, indexing strategy, ORM selection, serverless databases.

We split this skill into the rules it gives an agent

3 rules. 0 are common, 3 are distinctive, and 0 are very specific to this project.

  • 0

    Common

    Most of the 44 edited versions we read keep these.

  • 3

    Distinctive

    This author's own choices. Worth a look.

  • 0

    Very specific

    Tied to their project's names, files or tools. Probably skip.

  • Common
  • Distinctive
  • Very specific
  1. Distinctive:

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

    line 13
  2. Distinctive:

    ASK user for database preferences when unclear

    line 28
  3. Distinctive:

    Don't default to PostgreSQL for everything

    line 30

“Common” is measured: kept by at least 6 in 10 of the 44 edited versions of this file we could read. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

Keep what fits and drop the rest. Your version, ready for your agents.
Files
SKILL.md

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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