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

# Data model (core)

This section describes the data used for the DRC Sec non-CTP calculations, including how the data is structured.

For DRC Sec non-CTP, each **[Tranche](./tranche)** (Underlying) has a **Tranche Name**, **Bucket**, **Rating**, an optional **Risk Weight**, and fields to determine the risk weight and bucket (if not provided).

The **[Risk Factor](./risk-factor)** is used (along with the trade ID and as-of date) to identify the **[JTD Exposures](./jtd-exposure)**.
However, this field is not used directly in the calculations, instead the **Tranche** and **Maturity** fields are used.
This means that multiple **Risk Factor Names** may be used for the same risk-factor.

The [Field Mappings](./mappings) table lists all the fields across the data model and where they appear in the input files, database, and cube.