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ClaudSkills / Engineering / databases

Catalog Conventions

Category: Engineering  ·  Sub-category: databases  ·  Last updated:
Add or modify a PostgreSQL system-catalog entry — covers adding a pg_proc.dat builtin function, pg_operator.dat operator, pg_type.dat type, pg_cast.dat cast, pg_opclass.dat opclass, adding a new column on pg_class / pg_aggregate / pg_attribute / etc., BKI bootstrap entries, OID assignment policy (genbki.pl, unused_oids), catversion (CATALOG_VERSION_NO) bumping, and regenerating postgres.bki. Use whenever a PG patch edits anything under src/include/catalog/ (.h or .dat), adds a SQL-visible builtin (function/operator/type/cast/opclass), assigns or recycles an OID, or bumps the catversion. Skip for user-level information_schema queries on a running server, Django / Alembic / Rails / Flyway / Liquibase migrations, Oracle DBA_* / MySQL information_schema / Snowflake INFORMATION_SCHEMA catalog questions, schema design and normalization advice, ER-diagram tooling, and adding constraints to user-application tables.
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From the source SKILL.md

Background: knowledge/idioms/catalog-conventions.md. This skill is the hands-on procedure; consult it before/after any change to src/include/catalog/.h or .dat.

What this skill does

Catalog Conventions is a community-contributed Claude Code skill in the databases sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/catalog-conventions/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use whenever a PG patch edits anything under src/include/catalog/ (.h or .

Who uses this skill

The Catalog Conventions Claude Code skill is built for software engineers, backend developers, full-stack teams, and technical leads building and maintaining production systems. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 158,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/catalog-conventions
curl -L https://claudskills.com/skills/catalog-conventions/SKILL.md \
  -o ~/.claude/skills/catalog-conventions/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/catalog-conventions/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/catalog-conventions/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\catalog-conventions\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Telegram

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Catalog Conventions Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/catalog-conventions/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Catalog Conventions skill do?
Add or modify a PostgreSQL system-catalog entry — covers adding a pg_proc.dat builtin function, pg_operator.dat operator, pg_type.dat type, pg_cast.dat cast, pg_opclass.dat opclass, adding a new column on pg_class / pg_aggregate / pg_attribute / etc., BKI bootstrap entries, OID assignment policy (genbki.pl, unused_oids), catversion (CATALOG_VERSION_NO) bumping, and regenerating postgres.bki. Use whenever a PG patch edits anything under src/include/catalog/ (.h or .dat), adds a SQL-visible builtin (function/operator/type/cast/opclass), assigns or recycles an OID, or bumps the catversion. Skip for user-level information_schema queries on a running server, Django / Alembic / Rails / Flyway / Liquibase migrations, Oracle DBA_* / MySQL information_schema / Snowflake INFORMATION_SCHEMA catalog questions, schema design and normalization advice, ER-diagram tooling, and adding constraints to user-application tables.
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the Catalog Conventions skill?
Use Catalog Conventions when your Claude Code task falls under the Engineering category — specifically in the databases area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Catalog Conventions" or describe the task and let Claude pick). Browse related skills at /category/engineering/.
What is a Claude Code skill and how does the Catalog Conventions skill fit in?
A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Catalog Conventions is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Engineering category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
matejformanek. (2026). Catalog Conventions [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/catalog-conventions/
BibTeX
@misc{catalog-conventions-2026,
  author    = {matejformanek},
  title     = {Catalog Conventions [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/catalog-conventions/}
}

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Security scan

Grade A · scanned 2026-07-23 — free static scan against the OWASP Agentic Skills Top 10.

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