PATCH /text Runtime Improvements

[thehabes]

Optimizes PATCH /line/:lineId/text endpoint performance by parallelizing Page and Layer RERUM updates.

Before: 4-5 seconds per request
After: ~0.75 seconds per request (85% improvement)

Changes

• Parallelized independent Page and Layer RERUM writes using Promise.all()
• Predict RERUM page ID upfront to enable parallel execution (Layer only needs the page ID, not the full update result)

Technical Details

The updatePageAndProject() function previously ran Page and Layer updates sequentially. Now it:

Determines if page will be saved to RERUM:

const willBeSavedToRerum = isAlreadyInRerum || hasContent

For pages with content (common case): Runs parallel optimization

const [, finalLayer] = await Promise.all([
  page.update(),
  updatedLayer.update()
])

For temp page updates runs sequential without RERUM layer update

const updatedPage = await page.update()
layer.pages[pageIndex] = updatedPage  // keeps local ID

Notes

This optimization works in conjunction with a MongoDB index (__rerum.slug) applied to the RERUM database via MongoDB Atlas UI. The index reduced db.findOne from ~460ms to ~30ms.

Closes #426

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.