Stability Index Changelog: v2 archive
Historical release evidence. Return to current versions and the complete history index.
What this controls
Stability Index Changelog: v2 archive version history
Use this changelog to trace how Pharos changed the related scoring, data-source, threshold, or interpretation rules over time. Entries record the contract active at each release; archived rules are retained so historical charts and citations can be read against the rules active at the time.
Primary references
Latest version
v2.1Feb 27, 2026Reconstructed
Trend hardening and retention safety
Hardened trend input handling and operationalized rolling retention for PSI samples.
Impact snapshot
- 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
v2.1Feb 27, 2026ReconstructedTrend 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
DetailsHide details
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
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, 2026ReconstructedRemoved 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
DetailsHide details
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
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