new-migration

A helper that creates the two files needed for a database migration: one to apply a database change and one to undo it. It detects common migration tools and follows their numbering and naming conventions.

In plain words
What is it for?
Use it when adding tables, columns, indexes, or other database changes in projects using tools such as Rails, Alembic, Prisma, Drizzle, Knex, or golang-migrate.
Why use it?
It removes the manual work of finding the right migration folder, next sequence number, and file format. The paired undo file makes changes easier to reverse.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/random6913/claude-code-superkit/new-migration
Any agent
npx skills add RaNDoM6913/claude-code-superkit --skill new-migration
Clone the repo
git clone --depth 1 https://github.com/RaNDoM6913/claude-code-superkit

Made for: Claude Code, Codex.

Per session 26 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 902 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00026 $0.00902
Opus 5 $0.00013 $0.00451
Sonnet 5 $0.00005 $0.00180
Haiku 4.5 $0.00003 $0.00090

Measured yesterday against content hash 495d389f91f4, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

new-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 yesterday.

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.

packages/codex/skills/new-migration/SKILL.md · 103 lines

How it starts

The opening of the file, as written. The whole thing — 103 lines — stays where its author put it; the contents beside it link to each section on GitHub.

New Migration

Create a new database migration file pair following the project's conventions.

Context from User

Parse the user's request to determine the migration description and any specific SQL requirements.

Step 1 — Detect Migration System

Scan the project for migration directories and tools:

Marker Tool Directory Pattern Naming Pattern
backend/migrations/*.sql with numbered names golang-migrate backend/migrations/ 000NNN_desc.{up,down}.sql
migrations/*.sql with numbered names golang-migrate migrations/ 000NNN_desc.{up,down}.sql
db/migrations/*.sql golang-migrate / dbmate db/migrations/ NNNNNN_desc.{up,down}.sql
db/migrate/*.rb Rails db/migrate/ YYYYMMDDHHMMSS_desc.rb
alembic/versions/*.py Alembic alembic/versions/ rev_desc.py
prisma/migrations/ Prisma prisma/migrations/ YYYYMMDDHHMMSS_desc/
drizzle/ + drizzle.config.ts Drizzle drizzle/ NNNN_desc.sql

Step 2 — Find Next Number

# List existing migrations, find the latest number
ls <migrations_dir>/ | sort | tail -2

Increment the number by 1, keeping the project's zero-padding format.

Step 3 — Convert Description to Filename

Convert the user's description to snake_case for the filename:

  • "add user preferences" -> add_user_preferences
  • "Create events table" -> create_events_table

Step 4 — Create Migration Files

Create the migration pair in the detected directory:

For SQL migrations (golang-migrate, dbmate):

Up migration (000NNN_description.up.sql):

-- 000NNN_description.up.sql
-- Description: [user's description]

-- TODO: Add your migration SQL here

-- Conventions:
--   IF NOT EXISTS / IF EXISTS for safety
--   TIMESTAMPTZ for timestamps (not TIMESTAMP)
--   BIGSERIAL or UUID for primary keys
--   JSONB for flexible metadata
--   created_at TIMESTAMPTZ NOT NULL DEFAULT now() on new tables
--   ON DELETE CASCADE or SET NULL for foreign keys
--   CREATE INDEX for frequently queried columns

Read the full file on GitHub · 103 lines

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. yesterday First seen · 103 lines · 26 tokens per session scan A 495d389f91f4

Subscribe to this mod's changes

new-migration is a skill published in the GitHub repository RaNDoM6913/claude-code-superkit (2 stars, last pushed 1mo ago), licensed MIT. It adds 26 tokens to every session and 902 once invoked, about $0.0001 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 2026-08-31.

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