# Verify foreign keys

{% hint style="info" %}
**Coming Soon**

Syntho's improved subsetting feature will be re-introduced in the platform soon.
{% endhint %}

To ensure successful subsetting, it is important that the foreign keys in your source database are correctly configured. These foreign keys may be established within the source database.

In cases where foreign keys are absent from your source database, [foreign keys can be added manually](/configure-a-data-generation-job/manage-foreign-keys/add-virtual-foreign-keys.md) using the Syntho platform.

Syntho relies on properly configured foreign keys to navigate relationships and select the required rows from other tables, ensuring referential integrity in the generated subset.

Circular dependencies may occasionally arise in foreign key relationships, and information on how Syntho handles such cases can be found by referring to [What is subsetting](/subsetting/what-is-subsetting.md).


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