D8LooP - Practise Data Engineering

Preparing your workspaceloading the brief, studio & canvas…

buyersellerlistingorder

SCENARIO

You've joined Bloggy. Comments reply to other comments several levels deep. Users delete their own comments and moderators remove posts — but a deleted comment with replies underneath it can't simply vanish, or the conversation becomes unreadable. Legal requires removed content retrievable for ninety days.

your model must answer

01A post with its full comment thread in reading order, removals handled sensibly?
02All posts carrying a given tag, newest first?
03Delete a comment that has three replies under it?

out of scopeReactions · drafts · spam filtering · notifications · search

This exercise’s brief could not be loaded.The guided questions and their model answers come from the review service. It looks like it is not reachable — start it with pnpm dev:api and reload.The canvas below still works, so you can model now and run the review once the service is up.

Build starts here

The brief becomes the left drawer. The canvas stays the build surface.Study is done above. Build the tables here, hit review to validate, then use follow-ups to defend the model.

Practice studio

Ctrl/Cmd + C copyCtrl/Cmd + V pasteCtrl/Cmd + Z undoDelete remove

Start with the data model, then layer system context

Use entities and relationships for the real ERD. Add notes, containers, or curated cloud shapes only when they sharpen the story you are architecting.

68%

You built the model in the Studio. Now defend it.Deletion that doesn't break the thread

Design review

The reviewer reads your model.

Preparing your workspaceloading the brief, studio & canvas…

buyersellerlistingorder

SCENARIO

your model must answer

01A post with its full comment thread in reading order, removals handled sensibly?
02All posts carrying a given tag, newest first?
03Delete a comment that has three replies under it?

out of scopeReactions · drafts · spam filtering · notifications · search

Build starts here

The brief becomes the left drawer. The canvas stays the build surface.Study is done above. Build the tables here, hit review to validate, then use follow-ups to defend the model.

Practice studio

Ctrl/Cmd + C copyCtrl/Cmd + V pasteCtrl/Cmd + Z undoDelete remove

Start with the data model, then layer system context

Use entities and relationships for the real ERD. Add notes, containers, or curated cloud shapes only when they sharpen the story you are architecting.

68%

You built the model in the Studio. Now defend it.Deletion that doesn't break the thread

Design review