Anchor time filters to shared dataset coverage - #44
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Live CARTO coverage can advance into a new month before the validated tract snapshot. Preserve the live maximum for provenance, but anchor defaults and recent presets to the latest date shared with the snapshot; never substitute the wall clock while coverage is unavailable. Constraint: Existing valid shared URLs remain usable within live coverage. Rejected: Replace coverageMax with the snapshot maximum | this would understate live API coverage and reject valid live-only windows. Confidence: high Scope-risk: narrow Reversibility: clean Directive: Keep windowAnchorMax separate from coverageMax when adding data sources. Tested: VITE_FEATURE_DIARY=1 VITE_TRACT_CRIME_SNAPSHOT=1 npm run validate; npm run test:browser-smoke; npm audit --audit-level=high
This was referenced Aug 3, 2026
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Summary
Verification
Evidence
Live coverage was 2006-01-01 through 2026-08-02 while the shipped tract snapshot covers 2025-08-01 through 2026-08-01. The browser regression now proves the default remains 2025-08 instead of drifting to 2025-09 when live coverage crosses the month boundary.