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Share cold status reports and reduce daily aggregation work - #246
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Cold status-page requests each rebuilt the same report, multiplying database work during concurrent visits. Share one in-flight report, retry after failures, and format daily dates after aggregation while retaining the existing 15-second cache and full history.
Validation: 14 focused status tests, backend typecheck, formatting and diff checks passed. Three alternating synthetic comparisons at one million history rows preserved complete JSON responses: median cold report 651→566ms; three concurrent reports 1,918→562ms, reducing history/clock queries from 12+3 to 4+1. These are local stress measurements, not a reproduction of production latency. Hosted CI is not a merge gate for this change per maintainer instruction.