dc 4937edd7f4 feed: add a special missings post, and revert the blog edits
The special missings material that was added to the v4.0 blog post belongs in
its own post: that article is a release announcement for v4.0, not a teaching
piece. This reverts the blog change and publishes the content under /feed/.

The new post covers what SAS special missings are, how the SASjs Adapter
carries them between the browser and SAS, and how Data Controller's validation
rules treat them - NOTNULL passes, MINVAL fails, MAXVAL passes, and the regex
rules apply as they would to any other value.

The LinkedIn version of the copy, and the image prompt for the cover, are
recorded in a comment at the foot of the file.
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2026-08-09 17:39:33 +01:00
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🚀 Quick start

  1. Gatsby Cli

    This app is built with Gatsby CLI version: 2.12.59

  2. Start developing.

    Navigate into your sites directory and start it up.

    cd datacontroller.io/
    npm run develop
    
  3. Open the code and start customizing!

    Your site is now running at http://localhost:8000!

  4. Learn more

    Embed Video Examples:

    • video: [VideoTitle](https://www.youtube.com/embed/2Xc9gXyf2G4)
    • youtube: https://www.youtube.com/watch?v=XrK3hmYO4ag
    • vimeo: https://vimeo.com/417808409

    If want to add inline image with text left align / right align use following syntax, and place image to /static

    • Title
    • Title

📰 Blog & Feed content

There are two markdown-driven content sections on this site:

  • Blog (content/blog/) — long-form articles, product releases and case studies. Published at /blog/.
  • Feed (content/feed/) — short announcements and social-media style updates. Published at /feed/.

Both sections are combined into a single RSS feed at /rss.xml.

See docs/adding-feed-posts.md for a step-by-step guide on adding a new Feed post.

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