---
title: "Stability Index Changelog"
canonical: "https://pharos.watch/methodology/stability-index-changelog/archive/v1/"
description: "Stability Index Changelog - Pharos methodology version history."
---

# Stability Index Changelog

[All versions](https://pharos.watch/methodology/stability-index-changelog/)

<a id="changelog-v-1-3"></a>

## v1.3 - Sample architecture and 24h average model

**Effective:** 2026-02-26

PSI moved to sample-first storage with daily snapshots and 24h average surfaced as the primary displayed signal.

- Introduced stability_index_samples table and daily snapshot aggregation
- API and UI switched to emphasize 24h average PSI
- Historical backfill path adjusted for peak-deviation realism

Origin: Reconstructed from git commit history

Commits: `9508e29`, `ad75f4f`

<a id="changelog-v-1-2"></a>

## v1.2 - 15-minute chained compute + depeg depreciation/dedup

**Effective:** 2026-02-25

Operational and methodological upgrade to live 15-minute PSI with chronic-depeg depreciation and per-coin deduplication.

- PSI compute moved to chained 15-minute cron after stablecoin sync
- Introduced chronic-depeg depreciation (grace 30d, decay 120d, floor 25%)
- Active depegs deduped per coin (worst current bps, earliest start for age)

Origin: Reconstructed from git commit history

Commits: `8acaa7d`, `a79049d`, `2dfb975`, `615256a`

<a id="changelog-v-1-1"></a>

## v1.1 - Current deviation semantics

**Effective:** 2026-02-25

Severity began using live current deviation rather than event peak deviation for active depegs.

- Live severity became recovery-sensitive instead of peak-anchored
- Backfill behavior later diverged and was subsequently tuned

Origin: Reconstructed from git commit history

Commits: `14c75e7`

<a id="changelog-v-1-0"></a>

## v1.0 - Initial PSI release

**Effective:** 2026-02-25

Launched PSI compute, API, cron persistence, and frontend integration.

- Initial formula: 100 - severity - breadth - freezes + trend
- Initial caps: severity 60, breadth 15, freezes 10
- Condition bands introduced

Origin: Reconstructed from git commit history

Commits: `c4c7caa`, `c21a6bd`, `5eaf440`, `6b3e7e5`, `a3f2b53`