What is data-migration?

A workflow for moving CSV or JSON data into Dataverse, Azure Databricks, or Microsoft Fabric Lakehouse. It profiles the source, fixes a mapping contract, validates the data, loads it repeatedly without creating duplicates, and compares the result.

Use it to plan and approve mappings, validate existing data, perform upserts or full loads, and verify row counts, keys, and column values after migration.

It reduces migration errors such as duplicate keys, missing required values, invalid types, broken references, and incomplete loads.

How geekfujiwara/CodeAppsDevelopmentStandard configures Claude Code an

Reuse

Borrowing it

Nothing to install: this file belongs to geekfujiwara/CodeAppsDevelopmentStandard. 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/geekfujiwara/CodeAppsDevelopmentStandard/main/.github/skills/data-migration/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/geekfujiwara/CodeAppsDevelopmentStandard

Made for: Claude Code, Codex.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/geekfujiwara/codeappsdevelopmentstandard/data-migration/github.svg)](https://agentmods.dev/skills/geekfujiwara/codeappsdevelopmentstandard/data-migration)

Your own site

<a href="https://agentmods.dev/skills/geekfujiwara/codeappsdevelopmentstandard/data-migration"><img src="https://agentmods.dev/badge/skills/geekfujiwara/codeappsdevelopmentstandard/data-migration/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/geekfujiwara/codeappsdevelopmentstandard/data-migration"><img src="https://agentmods.dev/badge/skills/geekfujiwara/codeappsdevelopmentstandard/data-migration.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 114 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,698 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.

Model	Per session	Once invoked
Fable 5.1	$0.00114	$0.01698
Opus 5.5	$0.00046	$0.00679
Sonnet 5.5	$0.00023	$0.00340
Haiku 4.5	$0.00011	$0.00170

Measured 17d ago against content hash 69ad89ca5b4d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

data-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 17d ago.

The scan reads SKILL.md. This mod also ships 7 executable files (scripts/build_mapping.py, scripts/migrate_data.py, scripts/profile_source.py, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

.github/skills/data-migration/SKILL.md · 111 lines

How it starts

The opening of the file, as written. The whole thing — 111 lines — stays where its author put it; the contents beside it link to each section on GitHub.

データ移行スキル

既存データを、選定済みのデータ基盤へ 安全に・何度実行しても同じ結果になるように投入する。

原則	内容
契約を正とする	列・型・業務キー・参照関係を `mapping.json` に固定し、スクリプトはそれだけを読む
業務キー必須	各テーブルに一意の業務キーを持たせ、upsert / MERGE で冪等に投入する
先に全件検証	キー重複・必須 NULL・型変換・長さ・参照整合性を投入前にすべて検出する
変更は hash 承認	`plan` の `planHash` を利用者が承認してから `apply`。ソースが変われば hash も変わる
読み戻して照合	件数・キー集合・列値を投入先から読み戻して比較する。削除は行わない
パラメーター化	SQL・URL に値を埋め込まない。識別子は正規表現で検証する

サブリファレンス

リファレンス	内容
設計	責務分担、処理の流れ、投入方式、安全モデル
マッピング契約	`mapping.json` の仕様と型対応
テスト計画	Unit / Live の ID と合格基準
サンプル（cold-chain）	4 表・22 行。data-platform の基準質問の正解が 1 行に決まる
.env サンプル	本スキルのパラメータ
異常系・トラブルシュート	実際に踏んだ失敗と恒久対策

ワークフロー（正常系）

$dm = ".github/skills/data-migration/scripts"

Step 1: 投入先と権限を確認する

Code Apps 開発で SharePoint URL を受け取った場合、直接接続・継続利用の明示がなければ 投入先は Dataverse とする。移行か直接接続かを毎回聞き直さず、URL は移行元の参照情報として扱う。 URL を渡されたことだけを読み取り・書き込みの承認とせず、取得範囲と読み取り権限を確認する。既存の承認済みエクスポートを再利用するか、読み取り権限内で CSV / JSON を取得し、Step 2 に渡す。取得できなければ所有者へエクスポートを依頼し、SharePoint 直接接続へ黙って切り替えない。元の SharePoint データは変更・削除せず、移行後の常時同期も明示依頼なしには構築しない。

それ以外は選定済みの投入先（Dataverse / Databricks / Fabric Lakehouse）を再利用する。 AskUserQuestion では不足している書き込み承認、個人情報の扱い、既存データの上書き可否だけを確認する。投入先が未作成なら先に作るが、Code Apps の初回 push は移行完了を待たせない。全件検証・hash 承認・投入後の照合は省略しない。

投入先	事前に必要なもの	担当
Dataverse	テーブル・列・Lookup・業務キー列の代替キー	dataverse
Databricks	workspace・SQL warehouse・catalog（schema は自動作成）	data-platform
Fabric Lakehouse	capacity（Active）・workspace・Lakehouse	data-platform

Step 2: ソースをプロファイルする

python $dm/profile_source.py --source-dir data/ --out spec/profile.json

型・NULL 数・一意性・キー候補・外部キー候補を確認する。キー候補が無いテーブルは、業務キーを利用者と決める。

Read the full file on GitHub · 111 lines

Files

What ships with it

16 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

17d ago Changed · +9 lines 69ad89ca5b4d
1mo ago First seen · 102 lines · 114 tokens per session scan A 4b5926e40077

Subscribe to this mod's changes

data-migration is a skill published in the GitHub repository geekfujiwara/CodeAppsDevelopmentStandard (78 stars, last pushed yesterday), licensed MIT. It adds 114 tokens to every session and 1,698 once invoked, about $0.0005 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 2026-09-26.

Databases data

data-migration next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
data-migrationgeekfujiwara/CodeAppsDevelopmentStandard	Skill	78	yesterday	MIT	A	114	Claude Code, Codex
build-with-tinybasetinyplex/tinybase	Skill	5.2k	15d ago	MIT	A	90	Claude Code, Codex
databasebug-ops/zeph	Skill	66	3d ago	MIT	A	76	Claude Code, Codex
qdrantbug-ops/zeph	Skill	66	3d ago	MIT	A	88	Claude Code, Codex
dataframe-performancemakifbaysal/tasktrooper	Skill	120	16d ago	Apache-2.0	A	60	Claude Code, Codex
malloy-lookml-reviewmalloydata/publisher	Skill	130	today	MIT	A	58	Claude Code, Codex
data-data-warehousej4flmao/agent-skills	Skill	38	3d ago	MIT	A	96	Claude Code, Codex

CodeAppsDevelopmentStandard: Skill for Claude Code