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

# mart_degradation_history_envelope

> Pre-aggregated historical stint envelope for the Degradation Simulator.

<Note>Part of the [Marts](/transform/families/marts) family.</Note>

Pre-aggregated historical stint envelope for the Degradation Simulator. Grain: (circuit\_id, era, compound, lap\_in\_stint). For each physical circuit × regulation era × compound, captures at every lap-in-stint the observed fuel-removed pace distribution (p10/p50/p90 of weight\_corrected\_lap\_time) and the corresponding tyre-degradation-from-fresh band (the same minus the fresh-tyre anchor ref\_green\_pace\_s). A compound='\_all' rollup is emitted for fallback. Clean laps only (correction\_weight = 1, not SC/VSC, not major outlier); cells with \< 3 observations dropped.

## Lineage

```mermaid theme={null}
flowchart LR
  dim_circuits --> mart_degradation_history_envelope
  int_lap_residual_decomposed --> mart_degradation_history_envelope
  style mart_degradation_history_envelope fill:#e40404,stroke:#e40404,color:#fff
```

## Overview

| Property          | Value                                                                                                                                                                                                                               |
| ----------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Layer             | `marts`                                                                                                                                                                                                                             |
| Family            | [Marts](/transform/families/marts)                                                                                                                                                                                                  |
| Contract enforced | No                                                                                                                                                                                                                                  |
| Upstream          | [`int_lap_residual_decomposed`](../int/int_lap_residual_decomposed), [`dim_circuits`](../dim/dim_circuits)                                                                                                                          |
| Model-level tests | `unique_combination_of_columns`, `expect_table_row_count_to_be_between`, `expect_column_pair_values_A_to_be_greater_than_B`, `expect_column_pair_values_A_to_be_greater_than_B`, `expect_column_pair_values_A_to_be_greater_than_B` |

**22 tests** [guard](/transform/ci/overview) this model  -  22 generic, 0 singular.

## Columns

| Column                        | Type | Nullable | Tests                                                                                                          | Description                                                                               |
| ----------------------------- | ---- | -------- | -------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------- |
| `circuit_id`                  |      | Yes      | [`not_null`](/transform/ci/structural)                                                                         | Physical circuit identifier (slug of circuit\_name).                                      |
| `circuit_name`                |      | Yes      | [`not_null`](/transform/ci/structural)                                                                         | Canonical display name for the circuit.                                                   |
| `era`                         |      | Yes      | [`not_null`](/transform/ci/structural), [`accepted_values`](/transform/ci/range-and-domain)                    | Regulation era 'pre2022' (2018–2021) or 'post2022' (2022–2024).                           |
| `compound`                    |      | Yes      | [`not_null`](/transform/ci/structural)                                                                         | Tyre compound code, or '\_all' for the cross-compound rollup.                             |
| `lap_in_stint`                |      | Yes      | [`not_null`](/transform/ci/structural), [`expect_column_values_to_be_between`](/transform/ci/range-and-domain) | Lap number within the stint (1-based).                                                    |
| `n_observations`              |      | Yes      | [`not_null`](/transform/ci/structural), [`expect_column_values_to_be_between`](/transform/ci/range-and-domain) | Clean-lap count behind this cell (≥ 3).                                                   |
| `ref_green_pace_s`            |      | Yes      | [`not_null`](/transform/ci/structural), [`expect_column_values_to_be_between`](/transform/ci/range-and-domain) | Fuel-removed fresh-tyre anchor (median weight\_corrected\_lap\_time, age ≤ 2 laps).       |
| `obs_fuel_removed_pace_p10_s` |      | Yes      | [`not_null`](/transform/ci/structural)                                                                         | 10th percentile of fuel-removed lap time at this lap-in-stint.                            |
| `obs_fuel_removed_pace_p50_s` |      | Yes      | [`not_null`](/transform/ci/structural)                                                                         | Median fuel-removed lap time at this lap-in-stint.                                        |
| `obs_fuel_removed_pace_p90_s` |      | Yes      | [`not_null`](/transform/ci/structural)                                                                         | 90th percentile of fuel-removed lap time at this lap-in-stint.                            |
| `obs_deg_from_fresh_p10_s`    |      | Yes      | [`not_null`](/transform/ci/structural)                                                                         | p10 tyre-degradation-from-fresh (obs\_fuel\_removed\_pace\_p10\_s − ref\_green\_pace\_s). |
| `obs_deg_from_fresh_p50_s`    |      | Yes      | [`not_null`](/transform/ci/structural)                                                                         | p50 tyre-degradation-from-fresh.                                                          |
| `obs_deg_from_fresh_p90_s`    |      | Yes      | [`not_null`](/transform/ci/structural)                                                                         | p90 tyre-degradation-from-fresh.                                                          |