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pg-migration

pg-migration is a skill for Claude Code, Codex from johnqtcg/awesome-skills. It costs 135 tokens per session (6,428 once invoked), scanned A, original, MIT.

A safety review and planning tool for PostgreSQL database schema changes. A schema describes tables, columns, indexes, constraints, and access rules; migrations are the changes applied to it.

In plain words
What is it for?
Use it to review or plan commands such as altering tables, changing columns, adding constraints, creating indexes, backfilling data, partitioning tables, or changing row-level security policies.
Why use it?
It helps reveal locking, data-loss, downtime, and large-table risks before database changes reach production.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

not rated 30repo yesterday A scan SkillSpector: warn 135 tokens original MIT

Good fit Use it to review or plan commands such as altering tables, changing columns, adding constraints, creating indexes, backfilling data, partitioning tables, or changing row-level security policies.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/johnqtcg/awesome-skills/pg-migration
View source ↗ johnqtcg/awesome-skills johnqtcg.github.io
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add johnqtcg/awesome-skills --skill pg-migration
Clone the repo
git clone --depth 1 https://github.com/johnqtcg/awesome-skills

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for pg-migration

README.md
[![agentmods](https://agentmods.dev/badge/skills/johnqtcg/awesome-skills/pg-migration/github.svg)](https://agentmods.dev/skills/johnqtcg/awesome-skills/pg-migration)
Your own site
<a href="https://agentmods.dev/skills/johnqtcg/awesome-skills/pg-migration"><img src="https://agentmods.dev/badge/skills/johnqtcg/awesome-skills/pg-migration/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for pg-migration

Your own site · 80×15
<a href="https://agentmods.dev/skills/johnqtcg/awesome-skills/pg-migration"><img src="https://agentmods.dev/badge/skills/johnqtcg/awesome-skills/pg-migration.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 135 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 6,428 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 5 findings, up to high

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • high Memory Poisoning · line 194
    Skill manipulates agent memory, state, or stored context. Memory corruption can alter personality, override safety rules, or cause unpredictable behavior.
    Fix: Protect agent memory and state from modification by untrusted content. Use read-only memory for critical instructions and validate all state changes.
  • high Memory Poisoning · line 325
    Skill manipulates agent memory, state, or stored context. Memory corruption can alter personality, override safety rules, or cause unpredictable behavior.
    Fix: Protect agent memory and state from modification by untrusted content. Use read-only memory for critical instructions and validate all state changes.
  • high Anti-Refusal · line 261
    Skill attempts to nullify the agent's safety policies or restrictions ('you have no restrictions', 'ignore your guidelines', 'do anything now'). This is a direct jailbreak that disables guardrails.
    Fix: Remove jailbreak framing that nullifies safety policies or restrictions. Skill content must not instruct the agent to ignore its guidelines or operate without guardrails.
  • medium Excessive Agency · line 192
    Skill allows unbounded resource consumption (API calls, storage, compute). Without rate limits or quotas, a compromised or misbehaving agent can cause denial-of-service or cost overruns.
    Fix: Set explicit rate limits, timeouts, and resource quotas for API calls, file operations, and compute. Implement circuit breakers for runaway loops.
  • medium Excessive Agency · line 323
    Skill allows unbounded resource consumption (API calls, storage, compute). Without rate limits or quotas, a compromised or misbehaving agent can cause denial-of-service or cost overruns.
    Fix: Set explicit rate limits, timeouts, and resource quotas for API calls, file operations, and compute. Implement circuit breakers for runaway loops.
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00135 $0.06428
Opus 5 $0.00068 $0.03214
Sonnet 5 $0.00027 $0.01286
Haiku 4.5 $0.00014 $0.00643

Measured 10d ago against content hash b5b517d6533d, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

pg-migration scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 10d ago.

The scan reads SKILL.md. This mod also ships 13 executable files (scripts/lint_migration.py, scripts/mutation_sweep.py, scripts/pg_server_harness.sh, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/pg-migration/SKILL.md · 444 lines

How it starts

The opening of the file, as written. The whole thing — 444 lines — stays where its author put it; the contents beside it link to each section on GitHub.

PostgreSQL Migration Safety Review

Quick Reference

If you need to… Go to
Understand what this skill covers §1 Scope
Check mandatory prerequisites §2 Mandatory Gates
Choose review depth §3 Depth Selection
Handle incomplete context §4 Degradation Modes
Analyze DDL safety item by item §5 DDL Safety Checklist
Design a phased execution plan §6 Execution Plan
Avoid common migration mistakes §7 Anti-Examples
Score the review result §8 Scorecard
Format review output §9 Output Contract
Look up DDL lock levels by operation references/pg-ddl-lock-matrix.md
Plan a large-table (>10M rows) change references/large-table-migration.md

§1 Scope

In scope — schema migration safety for PostgreSQL 14–18 (the community-supported majors as of 2026-08; 12 and 13 are EOL, 19 is unreleased):

  • ALTER TABLE (add/drop/modify column, add/drop constraint, rename)
  • CREATE / DROP INDEX (including CONCURRENTLY)
  • Constraint management (FK, CHECK, UNIQUE, NOT NULL with NOT VALID pattern)
  • Data backfill and transformation migrations
  • Table restructuring (partitioning, splitting, merging)
  • RLS policy additions and modifications
  • Extension management (CREATE/ALTER EXTENSION)
  • Migration file review (Flyway, golang-migrate, Alembic, raw SQL)
  • Rollback planning leveraging PostgreSQL's transactional DDL

Out of scope — delegate to dedicated skills:

  • Query optimization, connection pooling, vacuum tuning → postgresql-best-practise
  • Application code changes → go-code-reviewer or language-specific reviewer
  • Security hardening, privilege management → security-review

Read the full file on GitHub · 444 lines

Files

What ships with it

36 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 10d ago First seen · 444 lines · 135 tokens per session scan A b5b517d6533d

Subscribe to this mod's changes

pg-migration is a skill published in the GitHub repository johnqtcg/awesome-skills (30 stars, last pushed yesterday), licensed MIT. It adds 135 tokens to every session and 6,428 once invoked, about $0.0007 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Claude CodeDatabasesPostgreSQLagentsai-assistantai-skillsanthropicdeveloper-tools
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