feat: performance analytics page at /jobs/performance#47
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Adds a new Performance page showing per-job-class statistics derived from the history table: run count, avg, p50, p95, min, and max duration. Rows are sorted by p95 descending so the slowest classes surface first. Period filter (1h / 24h / 7d / All) scopes the dataset. Each class name links to the History page pre-filtered to that class. Business logic lives in JobPerformanceStats service (matches DashboardStats pattern). Computation is DB-agnostic — durations are sorted in Ruby after a single pluck query. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
/jobs/performanceshowing per-job-class statistics derived from the history tableJobPerformanceStatsservice — singlepluckquery, Ruby-side aggregation for DB-agnostic percentile computationTest plan
JobPerformanceStats: count, avg/min/max, p50, p95, scope filtering, sort orderbundle exec rakepasses (RuboCop + RSpec)🤖 Generated with Claude Code