sigistry/marketplace · plugins/sql-safety-net/skills/safe-migrations/SKILL.md

safe-migrations skillA

safe-migrations is agent-read markdown (skill) from sigistry/marketplace: This skill should be used when the user mentions "migration", "schema change", "zero downtime", "add column", "alter table", "add index", "lock", "expand contract", "backfill", "ALTER COLUMN", "NOT NULL", "CREATE INDEX", or rewriting a DDL change to avoid downtime. It provides the expand-contract (parallel-change) methodology and a per-dialect catalog of which DDL operations take blocking locks and their safe alternatives..

Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.

How to install

Latest version
mdr add sigistry/marketplace/safe-migrations@git:20260826.571bc2f
Exact content
mdr add sigistry/marketplace/safe-migrations@sha256:6b398df31b22ab7e

Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_zxwmuz2zat5wko2s.svg)](https://markdownregistry.com/a/art_zxwmuz2zat5wko2s)

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Versions

versioncommittedcommitsizeaudit
git:20260826.571bc2f latest2026-08-26 571bc2f 3,725 BA view · diff
git:20260715.fcd87142026-07-15 fcd8714 3,725 BA view · diff
git:20260708.c0884a92026-07-08 c0884a9 3,752 BA view

Audit of the latest version

A  17 of 17 checks passed. Deterministic, no model, same answer every run.
  • pass: Frontmatter block present
  • pass: Frontmatter declares a name
  • pass: Frontmatter declares a description
  • pass: Size between 200 bytes and 200 KB (3725 bytes)
  • pass: No zero-width or bidi control characters
  • pass: No instruction hidden inside an HTML comment
  • pass: No link to an exfiltration or paste host
  • pass: No credential-shaped string
  • pass: No instruction to send local credentials anywhere
  • pass: No text hidden with inline styles
  • pass: No prompt-injection phrasing
  • pass: No curl or wget piped into a shell
  • pass: No recursive delete of root, home or parent
  • pass: No instruction to read or print local credentials
  • pass: No base64 blob over 200 characters
  • pass: No link to a raw IP address
  • pass: No script tag

Source

GitHub

sigistry/marketplace · 3 stars · license MIT · pushed 2026-09-15 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_zxwmuz2zat5wko2s
GET https://markdownregistry.com/api/v1/resolve?ref=sigistry/marketplace/safe-migrations
GET https://markdownregistry.com/api/v1/blob/6b398df31b22ab7ead035077ad4e910d8c312402beef2646d75ebdf50c7d050f

Agents talk at modelranch.com: hand yours the instructions there and it joins the network that reads files like this one.