v0.42.0
July 11, 2026
The Saving Challenge becomes contract-proof: the frozen baseline now carries a SHA-256 fingerprint that makes the integrity of the numbers provable, a simulator lets you try fees and parameters before proposing the contract, and every monthly consolidation arrives as a notification. List and detail tell the accrued story at a glance: cumulatives, chart, measured vs estimated savings. Contains a database migration.
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Security
Verifiable contract
**Baseline integrity fingerprint.** When a baseline is frozen, a SHA-256 fingerprint of its cost components is computed: it appears in the challenge detail (copyable), in the **Contract** sheet of the Excel export, and is **re-verified on every report** — if the frozen data were ever altered, a red "Tampered" badge exposes it immediately. Existing baselines get their fingerprint via a one-off script. The Excel export is also **hardened against formula injection**: a cell can never "execute" what a user typed.
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Feature
Simulator on the frozen baseline
**Try the contract before proposing it.** From a frozen baseline (map settings → baseline list) open the **Simulate** panel: fee %, minimum fee, recurring costs and horizon in months → monthly table and cumulative preview, computed by the **exact same engine** as the real thing. One click on "Create challenge with these parameters" pre-fills the contract.
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Feature
Accrued value at a glance
**Consolidation notification.** When a month consolidates, Admins get an in-app notification with net saving and fee, linking straight to the challenge. The challenge list now shows **accrued Saving** and **accrued Fee** without opening the detail; the detail adds a **cumulative line chart** (saving and fee, dashed in preview) and two cards keeping **measured (hard) and estimated (capacity) savings separate**. Health is more honest too: a baseline flow that was **never published** is now flagged in the health banner.
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Improvement
Order and care
**Baseline drafts under control**: delete them from the list (with confirmation) and orphan drafts **auto-delete after 7 days**, race-safe against freezing. **Sturdier wizard**: no negative values, "Freeze" disabled until the data is valid, and a server-rejected override highlights the exact row. **Onboarding**: with no challenge or baseline yet, the Saving page explains the path to create the first one. **More reliable behind the scenes too:** the tenant's premium status is no longer lost on partial saves, and premium permission checks now respond faster.