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Stability Index Changelog

Full version history of PSI methodology decisions, from v1.0 to v3.0.

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Latest Version

v3.0Mar 1, 2026Reconstructed

DEWS stress breadth component

Added DEWS-derived stress breadth as an explicit PSI component to capture broad non-depeg stress.

Impact Snapshot

  • Formula changed to: 100 - severity - breadth - stressBreadth + trend
  • New stressBreadth cap of 5 points
  • Cron now reads latest DEWS bands (ALERT/WARNING/DANGER) to derive stress breadth
v3.0Mar 1, 2026Reconstructed

DEWS stress breadth component

Added DEWS-derived stress breadth as an explicit PSI component to capture broad non-depeg stress.

  • Formula changed to: 100 - severity - breadth - stressBreadth + trend
  • New stressBreadth cap of 5 points
  • Cron now reads latest DEWS bands (ALERT/WARNING/DANGER) to derive stress breadth
Details

Impact Notes

  • Formula changed to: 100 - severity - breadth - stressBreadth + trend
  • New stressBreadth cap of 5 points
  • Cron now reads latest DEWS bands (ALERT/WARNING/DANGER) to derive stress breadth
Reconstructed from git commit history.1 commit
  • dcdefde
v2.1Feb 27, 2026Reconstructed

Trend hardening and retention safety

Hardened trend input handling and operationalized rolling retention for PSI samples.

  • NaN/Infinity trend values now treated as 0 before clamp
  • No formula change, but edge-case score corruption prevented
  • Sample retention/pruning standardized to 90 days
Details

Impact Notes

  • NaN/Infinity trend values now treated as 0 before clamp
  • No formula change, but edge-case score corruption prevented
  • Sample retention/pruning standardized to 90 days
Reconstructed from git commit history.2 commits
  • 76aa8c6
  • 74aa1cd
v2.0Feb 26, 2026Reconstructed

Removed freezes, rebalanced caps

Major methodology revision removing freezes and reallocating penalty capacity.

  • Removed freezes component from formula
  • Severity cap increased 60 -> 68
  • Breadth cap increased 15 -> 17
  • Formula became: 100 - severity - breadth + trend
Details

Impact Notes

  • Removed freezes component from formula
  • Severity cap increased 60 -> 68
  • Breadth cap increased 15 -> 17
  • Formula became: 100 - severity - breadth + trend
Reconstructed from git commit history.1 commit
  • bc2cfcf
v1.3Feb 26, 2026Reconstructed

Sample architecture and 24h average model

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
Details

Impact Notes

  • 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
Reconstructed from git commit history.2 commits
  • 9508e29
  • ad75f4f
v1.2Feb 25, 2026Reconstructed

15-minute chained compute + depeg depreciation/dedup

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)
Details

Impact Notes

  • 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)
Reconstructed from git commit history.4 commits
  • 8acaa7d
  • a79049d
  • 2dfb975
  • 615256a
v1.1Feb 25, 2026Reconstructed

Current deviation semantics

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
Details

Impact Notes

  • Live severity became recovery-sensitive instead of peak-anchored
  • Backfill behavior later diverged and was subsequently tuned
Reconstructed from git commit history.1 commit
  • 14c75e7
v1.0Feb 25, 2026Reconstructed

Initial PSI release

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
Details

Impact Notes

  • Initial formula: 100 - severity - breadth - freezes + trend
  • Initial caps: severity 60, breadth 15, freezes 10
  • Condition bands introduced
Reconstructed from git commit history.5 commits
  • c4c7caa
  • c21a6bd
  • 5eaf440
  • 6b3e7e5
  • a3f2b53