database-migration SKILL.md skillA
database-migration from vmobifystudio/app-dev-team is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add vmobifystudio/app-dev-team/database-migration@git:20260729.071181ePins git:20260729.071181e in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- vmobifystudio/app-dev-team
- Path
skills/database-migration/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260729.071181e, committed Jul 29, 2026
- Size
- 3,004 bytes
- Repository stars
- 5
- License
- MIT
Use before changing any persisted schema — by backend-developer on a server store, by web-developer on a client or server store, and by reliability-engineer when reviewing a change that migrates data. Triggers on the first column, field, index or model change, not on the deploy.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Database migration
A migration is the one change that **cannot be rolled back by reverting the commit**. Code reverts;
data that has already moved does not. Treat every migration as one-way until you have proven
otherwise.
Where a platform skill exists, use it — `axiom-database-migration`, `axiom-swiftdata-migration`, or
the auditor for your store. **External and optional**; missing → follow this file.
## Before you write it
1. **Enumerate every writer and every reader of the affected data** (`defect-hunting` §1). The
migration that stops one layer short is FC-001, and this is the surface where it costs most.
2. **Name the old and new shape explicitly**, including what happens to rows that violate the new
constraint *today*. There are always some.
3. **Decide expand or contract.** Almost always expand first:
- *Expand*: add the new column nullable, write both, backfill, read new with fallback to old.
- *Contract*: only after every deployed client and server writes the new shape. On mobile that
means **after the oldest supported app version is gone**, which is months, not the next sprint.
…Read the whole file at its exact version.
How to install
mdr add vmobifystudio/app-dev-team/database-migration@sha256:a6ea84bb9256ce71The line at the top of this page pins the label git:20260729.071181e, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_brww3elljh7w2bgy)
5 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Jul 29, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (3004 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
vmobifystudio/app-dev-team · 5 stars · license MIT · pushed 2026-11-02 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_brww3elljh7w2bgy GET https://markdownregistry.com/api/v1/resolve?ref=vmobifystudio/app-dev-team/database-migration GET https://markdownregistry.com/api/v1/blob/a6ea84bb9256ce71cd9ddca7e693d6d50f32441629eafff05719a9ae2376a53c
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
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