Wal And Xlog

Q: What is a Claude Code skill and how does the Wal And Xlog 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. Wal And Xlog is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: Security · Sub-category: web-security · Last updated: 2026-07-10

Add or modify a PostgreSQL WAL / XLOG record — covers choosing built-in rmgr vs Generic WAL (generic_xlog.c) vs custom rmgr (RegisterCustomRmgr), the XLogInsert + XLogRegisterBuffer idiom, writing a correct redo function, FPI / hint-bit (MarkBufferDirtyHint) rules, full-page-write handling, updating rmgrdesc + pg_waldump output, and bumping XLOG_PAGE_MAGIC when format changes. Use whenever a PG patch emits XLogInsert, adds an access method that needs durability, writes or modifies a redo function, registers a custom rmgr via RegisterCustomRmgr, or reviews a patch that changes WAL-record formats. Skip for MySQL binlog / GTID / row-based logging, SQLite WAL journal mode, Kafka log compaction / segment retention, pgbackrest / barman / wal-g operational config, recovery.conf / standby.signal DBA-side configuration, and generic write-ahead-logging theory or ARIES algorithm questions.

Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

This is the procedural cookbook. For the conceptual model (LSNs, FPI, checkpoints, rmgrs) read knowledge/architecture/wal.md first.

What this skill does

Wal And Xlog is a community-contributed Claude Code skill in the web-security sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/wal-and-xlog/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use whenever a PG patch emits XLogInsert, adds an access method that needs durability, writes or modifies a redo function, registers a custom rmgr via RegisterCustomRmgr, or reviews a patch that changes WAL-record formats. Skip for MySQL binlog / GTID / row-based logging, SQLite WAL journal mode, Kafka log compaction / segment retention, pgbackrest / barman / wal-g operational config, recovery.

Who uses this skill

The Wal And Xlog Claude Code skill is built for security engineers, penetration testers, DevSecOps practitioners, and development teams hardening codebases and infrastructure. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 153,000+ 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/wal-and-xlog
curl -L https://claudskills.com/skills/wal-and-xlog/SKILL.md \
  -o ~/.claude/skills/wal-and-xlog/SKILL.md

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

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

📱 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 Wal And Xlog Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/wal-and-xlog/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the Wal And Xlog skill do?

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 Wal And Xlog skill?

Use Wal And Xlog when your Claude Code task falls under the Security category — specifically in the web security 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 Wal And Xlog" or describe the task and let Claude pick). Browse related skills at /category/security/.

What is a Claude Code skill and how does the Wal And Xlog 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. Wal And Xlog is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Source: https://github.com/matejformanek/postgres-claude/blob/HEAD/.claude/skills/wal-and-xlog/SKILL.md
License: PostgreSQL
Author: matejformanek
Website: https://github.com/matejformanek/postgres-claude

Cite this skill

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

APA

matejformanek. (2026). Wal And Xlog [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/wal-and-xlog/

BibTeX

@misc{wal-and-xlog-2026,
  author    = {matejformanek},
  title     = {Wal And Xlog [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/wal-and-xlog/}
}

Embed this skill

Promote, attribute, or link this skill from your own README, blog post, or documentation. All three snippets are free to use — no sign-up, no API key. More distribution surfaces →

Badge

[![ClaudSkills](https://claudskills.com/badge/wal-and-xlog.svg)](https://claudskills.com/skills/wal-and-xlog/?utm_source=badge&utm_medium=readme&utm_campaign=skill_badge)

Security scan

Grade A · scanned 2026-07-18 — free static scan against the OWASP Agentic Skills Top 10.

No risk patterns were found in any of the ten OWASP-aligned categories. How grading works ›

✓ Prompt injection
✓ Data exfiltration
✓ Supply chain
✓ Reverse shell
✓ Credentials
✓ Execution
✓ Filesystem
✓ Persistence
✓ Obfuscation
✓ Network

Show this grade on your repo (click to copy):

[![Security: A](https://img.shields.io/badge/Security-A-2e7d32)](https://claudskills.com/skills/wal-and-xlog/#security)

More Security skills

Browse all Security skills in the ClaudSkills registry, or explore these other picks from the same category:

Browse all Security skills → Top 100 skills

Part of ClaudSkills — the open registry for Claude Skills & Claude Code Skills. · What's New · Install guide · About · llms.txt

Part of Acreator Store — Adam Lankamer's AI tools: PerfectStudio · Ucaption · UTagger · AutoXPoster · TestYourSkills · AutomationFlows · Au Naturel · Telegram @acreatorstore