> For the complete documentation index, see [llms.txt](https://docs.heisenware.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.heisenware.com/release-notes/v91-worth-it.md).

# v91 — Worth It

<div align="left"><figure><img src="/files/tDo9LesKO2ennCE3jQq3" alt=""><figcaption></figcaption></figure></div>

## Features

* Manage professional licenses, subscriptions, and self-service payments through a Stripe integration in the Plan & Billing screen of the [App Manager](/app-manager/overview.md).
* Added support for multi-field configurations in the [timeseries database](/app-builder/build-backend/functions/storage/timeseries-database.md).
* Released a lightweight [Docker Agent](/app-builder/build-backend/agents/docker-agent.md) designed to run on resource-constrained edge devices and IoT gateways.
* Added new `Duration` and `Interval` helper objects for JavaScript expressions within the [modifier](/app-builder/build-backend/extension-nodes/modifier.md#javascript-expressions) extension node.

## Improvements

* Optimized [App Builder](/app-builder/overview.md) performance and decreased workspace load times, especially when reloading browser pages.

## Fixes

* Fixed canvas widget transformations when zooming on pages with extended height in the [Frontend Builder](/app-builder/build-frontend.md).
* Fixed an issue where [Production Apps](/production-apps/overview.md) performed incorrect automatic page switching after a new deployment.
* Resolved a race condition that created zombie subscriptions on the broker, improving overall platform performance.
* Fixed a CSS z-index layout bug that caused widgets to overflow the bottom navigation bar.
* Fixed event-style function subscription losses that occurred when an [Agent](/app-builder/build-backend/agents.md) encountered network reconnections.


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