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

# composition_event

The clinical service, such as a colonoscopy or an appendectomy, being documented (`Composition.event[]`).

**Primary Keys:**

* composition\_event\_id

**Foreign Keys:**

* composition\_id - links to the [composition](/medical-api/handling-data/schema-v100/composition/base) table

| Column | Data Type | Description |
| - | - | - |
| composition\_event\_id | varchar | Unique identifier for the event row |
| composition\_id | varchar | Parent composition |
| period\_start | datetime | Start of the event period |
| period\_end | datetime | End of the event period |

**Related Tables:**

**Parent:**

* [composition](/medical-api/handling-data/schema-v100/composition/base)


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