postgresql-table-design SKILL.md skillA

This file is byte-identical to the first copy the registry indexed. Same content hash, so the same checks give both the same grade.

postgresql-table-design from hermeticormus/libreuiux-claude-code is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

mdr add hermeticormus/libreuiux-claude-code/postgresql-table-design@git:20251120.288a379

Pins git:20251120.288a379 in mdr.lock. Pin the fingerprint instead.

Audit grade

A, 17 of 17 checks passed

Kind

SKILL.md skill

Repository

hermeticormus/libreuiux-claude-code

Path

plugins/database-design/skills/postgresql/SKILL.md

Versions recorded

1

Latest version

git:20251120.288a379, committed Nov 20, 2025

Size

16,049 bytes

Repository stars

118

License

MIT

Design a PostgreSQL-specific schema. Covers best-practices, data types, indexing, constraints, performance patterns, and advanced features.

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

# PostgreSQL Table Design 

## Core Rules

- Define a **PRIMARY KEY** for reference tables (users, orders, etc.). Not always needed for time-series/event/log data. When used, prefer `BIGINT GENERATED ALWAYS AS IDENTITY`; use `UUID` only when global uniqueness/opacity is needed.
- **Normalize first (to 3NF)** to eliminate data redundancy and update anomalies; denormalize **only** for measured, high-ROI reads where join performance is proven problematic. Premature denormalization creates maintenance burden.
- Add **NOT NULL** everywhere it’s semantically required; use **DEFAULT**s for common values.
- Create **indexes for access paths you actually query**: PK/unique (auto), **FK columns (manual!)**, frequent filters/sorts, and join keys.
- Prefer **TIMESTAMPTZ** for event time; **NUMERIC** for money; **TEXT** for strings; **BIGINT** for integer values, **DOUBLE PRECISION** for floats (or `NUMERIC` for exact decimal arithmetic).

## PostgreSQL “Gotchas”

- **Identifiers**: unquoted → lowercased. Avoid quoted/mixed-case names. Convention: use `snake_case` for table/column names.
…

Read the whole file at its exact version.

How to install

mdr add hermeticormus/libreuiux-claude-code/postgresql-table-design@sha256:05006a2c3f1fdc68

[![mdr](https://markdownregistry.com/badge/art_pu6aihhzjp6b4idg.svg)](https://markdownregistry.com/a/art_pu6aihhzjp6b4idg)

Versions

The registry has recorded 1 version of this file, committed on Nov 20, 2025.

Audit of the latest version

Source

API

GET https://markdownregistry.com/api/v1/artifacts/art_pu6aihhzjp6b4idg
GET https://markdownregistry.com/api/v1/resolve?ref=hermeticormus/libreuiux-claude-code/postgresql-table-design
GET https://markdownregistry.com/api/v1/blob/05006a2c3f1fdc68dd308e8a7ad7daffd7e8f7b910643d241e31e4484110b107

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 hermeticormus/libreuiux-claude-code

Every file in hermeticormus/libreuiux-claude-code

Other files named postgresql-table-design

Browse by kind, by grade A, or by owner.