teernisse cfbbb9d6db feat: add domain model types for session metrics and statistics ...

Define the core data structures that flow through the entire pipeline:

- model/session.go: SessionStats (per-session aggregates including
  token counts across 5 categories — input, output, cache_write_5m,
  cache_write_1h, cache_read), APICall (deduplicated by message.id,
  keyed to the final billed usage), and ModelUsage (per-model
  breakdown within a session). Tracks subagent relationships via
  IsSubagent/ParentSession fields.

- model/metrics.go: Higher-order aggregate types — SummaryStats
  (top-level totals with per-active-day rates for cost, tokens,
  sessions, and minutes), DailyStats/HourlyStats/WeeklyStats
  (time-bucketed views), ModelStats (cross-session model comparison
  with share percentages), ProjectStats (per-project ranking), and
  PeriodComparison (current vs previous period for delta display).

- model/budget.go: BudgetStats with plan ceiling, custom budget,
  burn rate, and projected monthly spend for the budget tab.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-02-19 13:00:57 -05:00

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