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

# Data models

> The data model owned by the Order Group domain.

The Order Group domain is owned by the **Seller module**. There is no separate
order-group module. This reference lists its data model and fields. For the full
module overview, see the [Order Group overview](/platform/order-group/overview).

## OrderGroup

Table `order_group`, id prefix `og`. The aggregate over the per-seller orders
created from a single cart.

| Field                       | Type      | Notes                                             |
| --------------------------- | --------- | ------------------------------------------------- |
| `id`                        | text      | Primary key (prefix `og`)                         |
| `display_id`                | integer   | Auto-incrementing, human-readable reference       |
| `customer_id`               | text      | Nullable; who placed the group                    |
| `cart_id`                   | text      | The originating cart (read-only link to Cart)     |
| `seller_count`              | number    | **Computed**: distinct sellers with a child order |
| `total`                     | bigNumber | **Computed**: sum of child order totals           |
| `created_at` / `updated_at` | dateTime  | Timestamps                                        |
| `deleted_at`                | dateTime  | Nullable; soft-delete marker                      |

Relations: `orders` (one-to-many through the `order_group_order` link table),
`cart` (read-only, via `cart_id`).

<Note>
  `seller_count` and `total` are marked `computed()`. They hold no value on the
  row and are aggregated from the group's child orders each time it's read. See
  [Computed totals](/platform/order-group/concepts/computed-totals).
</Note>

<Warning>
  The `cart_id` link is **read-only**. The cart is frozen (`completed_at` is set)
  the moment the split runs, so it's a historical reference and can't be written
  through the group.
</Warning>