[Thedan-1]

I ran into silent loss of enum changes while testing a PostgreSQL schema revision locally on dc32c8b (Windows, Node 22.14.0, Chromium-based in-app browser, Chinese UI).

The workflow was: create an orders table, let it save, use Save as to make orders-v2-test, open that copy, remove its table, then define order_status with the value pending. Save as itself worked and the original diagram remained intact. The problem started when the copy contained only enums: the header still said “No changes”, and refreshing removed the enum.

The same guard causes the reverse problem: load a saved enum-only diagram, delete its last enum, and refresh. The UI says the enum was deleted, but it returns after reload.

This patch counts enums when deciding whether there is content to autosave and watches their count. It also lets edits recorded in undo/redo history save an empty diagram, so deleting the last object or undoing its creation persists. A fresh, untouched empty canvas still does not trigger autosave.

Local verification

• Before: created enum disappeared on reload; deleted last enum returned on reload.
• After: enum name and value survived reload; deleting the last enum survived reload; creating an enum and undoing it left the diagram empty after reload.
• Reopened the original orders diagram: its table remained intact.
• npm run lint and npm run build passed. Build emitted bundle-size and third-party dependency warnings.

These are actual browser checks against the running application, not mocked UI or automated unit tests. Screenshots are stored on a separate branch of my fork and are not part of the code diff.

Evidence

Enum entered, but header still shows no changes:

Original code after reload — enum is gone:

Patched code after reload — name and value remain:

Additional deletion-before/after screenshots.

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[1ilit]

Good catch, thank you!