> ## Documentation Index
> Fetch the complete documentation index at: https://docs.luklak.com/llms.txt
> Use this file to discover all available pages before exploring further.

# System & Auto-Generated Fields

> A reference guide to all built-in fields in Luklak, including configurable system components like Checklists and Attachments, and read-only auto-generated metadata.

Beyond the custom fields you create, Luklak automatically provides two types of powerful, built-in fields on every `Object`. Understanding these fields is key to building a rich user experience and leveraging the full analytical power of the platform.

<Info>
  This guide covers fields that are provided by the system.

  * **System Components** are features you can show or hide on a `Data Screen`.
  * **Auto-Generated Fields** are read-only metadata for reporting and automation.
</Info>

## Configurable System Components

These are powerful feature blocks that you can choose to **Show or Hide** on any `Data Screen` to tailor the user experience for a specific `Object Type`.

<CardGroup cols={2}>
  <Card title="Description" icon="align-left" iconType="duotone">
    A prominent rich text block perfect for detailed explanations, instructions, or scope definitions.
  </Card>

  <Card title="Checklist" icon="list-check" iconType="duotone">
    An interactive to-do list within the Object, ideal for breaking down minor sub-tasks or acceptance criteria.
  </Card>

  <Card title="Sub-objects" icon="cubes-stacked" iconType="duotone">
    A dedicated section to create, view, and manage nested child Objects, enabling multi-level work breakdown.
  </Card>

  <Card title="Attachments" icon="paperclip" iconType="duotone">
    The area where users can upload and manage files, documents, and images related to the Object.
  </Card>

  <Card title="Live Photo" icon="camera-retro" iconType="duotone">
    A mobile-first feature for capturing geo-tagged and time-stamped photos, perfect for on-site verification or progress tracking.
  </Card>
</CardGroup>

## Read-Only Auto-Generated Fields

For every single `Object` created, the system automatically generates and maintains a set of read-only metadata fields. While users cannot edit these fields, they are invaluable for sorting, filtering, reporting, and building powerful automations.

| Field Name      | Data Type | Description                                                                |
| :-------------- | :-------- | :------------------------------------------------------------------------- |
| `Object key`    | Text      | A unique, system-wide identifier for the Object (e.g., `CRM-1234`).        |
| `creator`       | User      | The user who originally created the Object.                                |
| `created`       | Timestamp | The exact date and time the Object was created.                            |
| `updated`       | Timestamp | The exact date and time any field on the Object was last modified.         |
| `statuschanged` | Timestamp | The exact date and time the Object's status was last changed.              |
| `discussed`     | Timestamp | The exact date and time the last message was sent in the Object's chat.    |
| `interacted`    | Timestamp | The most recent timestamp from `updated`, `statuschanged`, or `discussed`. |

\[Guidejar Placeholder: A tutorial showing a user creating a 'Saved Filter' to find 'all tasks I created in the last 7 days' by using the `creator` and `created` auto-fields.]

## What's Next?

You now have a complete understanding of every type of data field in Luklak—basic, advanced, and system-provided. The final step is to learn how this rich data is leveraged across the platform.

* [**Learn How to Put Your Data to Work**](/en/02-platform/platform-overview/data-fields/using-field-data)
* [**Explore Global Management of Data Components**](/en/02-platform/platform-overview/data-fields/global-management)
* [**Return to the Data Fields & Screens Overview**](/en/02-platform/platform-overview/data-fields)