Home / wst2002 / claude-code-skills · GitHub

database-schema-design SKILL.md skillA

database-schema-design from wst2002/claude-code-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add wst2002/claude-code-skills/database-schema-design@git:20261016.55bd98a

Pins git:20261016.55bd98a in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: wst2002/claude-code-skills
Path: skills/database-schema-design/SKILL.md
Versions recorded: 2
Latest version: git:20261016.55bd98a, committed Oct 16, 2026
First version recorded: Oct 16, 2026
Size: 3,436 bytes
Repository stars: 3
License: MIT

Use when designing a database from scratch, reviewing tables, an ERD, a Prisma/TypeORM/JPA/Django/SQLAlchemy schema or SQL migrations, adding indexes, normalizing data, or making a migration safe for production — Postgres, MySQL or SQLite.

Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.

What the file says

# Database Schema Design

## Overview

A good schema makes invalid data impossible and common queries fast. Push rules into constraints, derive indexes from real access patterns, and never ship a migration that locks or loses data.

## Designing from scratch

1. **Entities and relationships.** List nouns, their cardinality (1:1, 1:N, N:M) and ownership. N:M gets a join table.
2. **Keys.** Surrogate primary key (bigint identity or UUIDv7). Natural uniqueness becomes a `UNIQUE` constraint, not the PK.
3. **Columns.** Right type, `NOT NULL` by default, defaults where sensible. See the type table.
4. **Constraints.** Foreign keys with explicit `ON DELETE`, `UNIQUE`, `CHECK`, enums or lookup tables for closed sets.
5. **Access patterns → indexes.** Write the top 5-10 queries first; index their `WHERE`, `JOIN` and `ORDER BY` columns.
6. **Lifecycle.** `created_at`, `updated_at`; soft delete only if the product needs restore or audit.
7. **Migration plan** (below).

## Reviewing an existing schema

Check every table against [checklist.md](checklist.md). Read the queries in the code too: a schema is only "wrong" relative to how it is used.

## Type choices

| Data | Use | Avoid |
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add wst2002/claude-code-skills/database-schema-design@sha256:22fdc3d310dc4987

The line at the top of this page pins the label git:20261016.55bd98a, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.

Badge

[![mdr](https://markdownregistry.com/badge/art_gxkehw6bqodqvvgi.svg)](https://markdownregistry.com/a/art_gxkehw6bqodqvvgi)

2 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 2 versions of this file, all committed on Oct 16, 2026.

version	committed	commit	size	audit
git:20261016.55bd98a latest	2026-10-16	55bd98a	3,436 B	A	view · diff
git:20261016.c3a2cef	2026-10-16	c3a2cef	3,234 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (3436 bytes)
pass: No zero-width or bidi control characters
pass: No instruction hidden inside an HTML comment
pass: No link to an exfiltration or paste host
pass: No credential-shaped string
pass: No instruction to send local credentials anywhere
pass: No text hidden with inline styles
pass: No prompt-injection phrasing
pass: No curl or wget piped into a shell
pass: No recursive delete of root, home or parent
pass: No instruction to read or print local credentials
pass: No base64 blob over 200 characters
pass: No link to a raw IP address
pass: No script tag

Source

GitHub

wst2002/claude-code-skills · 3 stars · license MIT · pushed 2026-10-19 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_gxkehw6bqodqvvgi
GET https://markdownregistry.com/api/v1/resolve?ref=wst2002/claude-code-skills/database-schema-design
GET https://markdownregistry.com/api/v1/blob/22fdc3d310dc49876385289400a45a4328d3bb5a2593b2f867adee8b1a801868

Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.

Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.

More from wst2002/claude-code-skills

proof-of-done SKILL.md skill

wst2002/claude-code-skills · plugins/proof-of-done/skills/proof-of-done/SKILL.md · Use before saying work is done, fixed, or complete after changing code. Run the project's checks, show their results…