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spekka: Skill for Claude Code

.claude/skills/spekka-backend-migrations/SKILL.md

Backend Migrations is a skill for Claude Code from johnreitano/spekka. It costs 25 tokens per session (202 once invoked), scanned A, original, MIT.

Guidance for changing the structure of a backend database safely. A backend database stores an application's data, and a migration is a versioned change to its tables, columns, or indexes.

In plain words
What is it for?
Use it when writing database migrations. It covers rollback steps, small focused changes, separate schema and data updates, careful index creation, compatibility during deployment, naming, and version control.
Why use it?
It reduces the risk of failed deployments, locked tables, data loss, and changes that cannot be undone.

Skill for Claude Code

Written for Claude Code: installed under .claude/. Also seen: mentions Claude Code.

This is johnreitano/spekka's own configuration. It tells Claude Code how to work on spekka 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 spekka configures →

not rated 5repo 9mo ago A scan 25 tokens original MIT
View source ↗ johnreitano/spekka
Reuse

Borrowing it

Nothing to install: this file belongs to johnreitano/spekka. 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/johnreitano/spekka/main/.claude/skills/spekka-backend-migrations/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/johnreitano/spekka

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 Backend Migrations

README.md
[![agentmods](https://agentmods.dev/badge/skills/johnreitano/spekka/spekka-backend-migrations/github.svg)](https://agentmods.dev/skills/johnreitano/spekka/spekka-backend-migrations)
Your own site
<a href="https://agentmods.dev/skills/johnreitano/spekka/spekka-backend-migrations"><img src="https://agentmods.dev/badge/skills/johnreitano/spekka/spekka-backend-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 Backend Migrations

Your own site · 80×15
<a href="https://agentmods.dev/skills/johnreitano/spekka/spekka-backend-migrations"><img src="https://agentmods.dev/badge/skills/johnreitano/spekka/spekka-backend-migrations.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 25 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 202 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 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 $0.00025 $0.00202
Opus 5.5 $0.00010 $0.00081
Sonnet 5.5 $0.00005 $0.00040
Haiku 4.5 $0.00003 $0.00020

Measured 2mo ago against content hash cb4da08f358b, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

Backend 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 2mo 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/spekka-backend-migrations/SKILL.md · 19 lines

What it actually says

Backend Migrations

This Skill provides Claude Code with specific guidance on how it should handle backend migrations.

Instructions

  • Reversible Migrations: Always implement rollback/down methods to enable safe migration reversals
  • Small, Focused Changes: Keep each migration focused on a single logical change for clarity and easier troubleshooting
  • Zero-Downtime Deployments: Consider deployment order and backwards compatibility for high-availability systems
  • Separate Schema and Data: Keep schema changes separate from data migrations for better rollback safety
  • Index Management: Create indexes on large tables carefully, using concurrent options when available to avoid locks
  • Naming Conventions: Use clear, descriptive names that indicate what the migration does
  • Version Control: Always commit migrations to version control and never modify existing migrations after deployment
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. 2mo ago First seen · 19 lines · 25 tokens per session scan A cb4da08f358b

Subscribe to this mod's changes

Backend Migrations is a skill published in the GitHub repository johnreitano/spekka (5 stars, last pushed 9mo ago), licensed MIT. It adds 25 tokens to every session and 202 once invoked, about $0.0001 per session on Opus 5.5. 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.

Backend and APIsDatabases
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Backend Migrations next to 6 skills from other repositories
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