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book-ddia-data-design

Guides data-intensive design checks for consistency, reliability, schema evolution, and data flow risks. In strict tasks, mandatory before design stabilizes or implementation begins when changing persisted/shared data, schemas, migrations, shared/persistent/cross-request/cross-process caches, async or cross-service flows, data ownership, or recovery; in default/lite tasks, use on demand when those risks or explicit delivery requirements are present.

packages/omp-sbtd/skills/book-ddia-data-design/SKILL.md

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# Book DDIA Data Design

Use this Skill when a change can fail because of data semantics, distributed behavior, or operational reality rather than ordinary code structure.

It is derived from the `mini` rule style of `agent-rules-books` and should complement project architecture, task design, source/LSP/contract impact analysis, tests, and production validation.

## Strict Development Gate

In a strict task, run this Skill before design artifacts become stable or implementation begins when the task changes any of the following:

- Persisted or shared data, databases, schemas, or migrations.
- shared, persistent, cross-request, or cross-process caches; queues, events, streams, jobs, ETL, or analytics pipelines.
- Cross-service data flow or API ownership.
- Data ownership, source of truth, transaction boundaries, or read / write paths.