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

# Configuring Profile Slots

Memobase allows for detailed customization of how profile slots are created and updated.

## Instructing Profile Creation

Memobase uses a `topic` and `sub_topics` structure to define a profile slot. For example:

```yaml theme={null}
overwrite_user_profiles:
    - topic: "work"
      sub_topics:
        - "company"
        - "position"
        - "department"
```

While this structure is often sufficient, you can provide additional `description` fields to give the AI more context and ensure it tracks the information you need with greater accuracy.

```yaml theme={null}
overwrite_user_profiles:
    - topic: "work"
      sub_topics:
        - name: "start_date"
          description: "The user's start date at their current job, in YYYY-MM-DD format."
```

The `description` field is optional but highly recommended for achieving precise data extraction.

## Instructing Profile Updates

Memobase not only creates profile slots but also maintains them over time. When a user provides new information, Memobase must decide how to update the existing data.

For example, if a user mentions a new job, the `work/start_date` slot needs to be updated:

* **Old Value**: `2020-01-01`
* **New Information**: User starts a new job in 2021.
* **Default Update**: The value is replaced with `2021-01-01`.

You can control this update behavior by adding an `update_description` to the profile slot. For instance, if you wanted to keep a record of the user's *first-ever* job start date, you could configure it like this:

```yaml theme={null}
overwrite_user_profiles:
    - topic: "work"
      sub_topics:
        - name: "start_date"
          description: "The user's start date at their current job, in YYYY-MM-DD format."
          update_description: "Always keep the oldest start date. Do not update if a date already exists."
```

With this instruction, Memobase will preserve the original `start_date` instead of overwriting it.