claude-GUNDAM-zh-tw: Skill for Claude Code

.claude/skills/database-migrations/SKILL.md

database-migrations is a skill for Claude Code from bheadwei/claude-GUNDAM-zh-tw. It costs 154 tokens per session (1,968 once invoked), scanned A, original, no licence file.

A guide to changing a database schema safely over time. Migrations are tracked steps that add, change, or remove database tables and fields while keeping application code aligned.

In plain words
What is it for?
It helps plan schema and data migrations, roll them back, and prepare changes for PostgreSQL, MySQL, and common ORMs.
Why use it?
It helps prevent lost data, failed rollbacks, and downtime when database structures change.

Skill for Claude Code

Written for Claude Code: installed under .claude/.

This is bheadwei/claude-GUNDAM-zh-tw's own configuration. It tells Claude Code how to work on claude-GUNDAM-zh-tw itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything claude-GUNDAM-zh-tw configures →

Reuse

Borrowing it

Nothing to install: this file belongs to bheadwei/claude-GUNDAM-zh-tw. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/bheadwei/claude-GUNDAM-zh-tw/main/.claude/skills/database-migrations/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/bheadwei/claude-GUNDAM-zh-tw

Made for: Claude Code.

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 database-migrations

README.md
[![agentmods](https://agentmods.dev/badge/skills/bheadwei/claude-gundam-zh-tw/database-migrations/github.svg)](https://agentmods.dev/skills/bheadwei/claude-gundam-zh-tw/database-migrations)
Your own site
<a href="https://agentmods.dev/skills/bheadwei/claude-gundam-zh-tw/database-migrations"><img src="https://agentmods.dev/badge/skills/bheadwei/claude-gundam-zh-tw/database-migrations/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 database-migrations

Your own site · 80×15
<a href="https://agentmods.dev/skills/bheadwei/claude-gundam-zh-tw/database-migrations"><img src="https://agentmods.dev/badge/skills/bheadwei/claude-gundam-zh-tw/database-migrations.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 154 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,968 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.
Origin unknown 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 $0.00154 $0.01968
Opus 5 $0.00077 $0.00984
Sonnet 5 $0.00031 $0.00394
Haiku 4.5 $0.00015 $0.00197

Measured 3d ago against content hash 9e4c91f11935, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

database-migrations 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 3d ago.

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.

.claude/skills/database-migrations/SKILL.md · 234 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

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. 3d ago Changed · -102 lines · +102 tokens per session 9e4c91f11935
  2. 8d ago First seen · 336 lines · 52 tokens per session scan A 01d862480a07

Subscribe to this mod's changes

database-migrations is a skill published in the GitHub repository bheadwei/claude-GUNDAM-zh-tw (11 stars, last pushed yesterday), with no licence file. It adds 154 tokens to every session and 1,968 once invoked, about $0.0008 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 2026-09-03.

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