Function aggregateStats

packages/arctic/src/cli/cmd/stats.ts:440–654

(dateFilter?: DateFilter)

}

async function aggregateStats(dateFilter?: DateFilter): Promise<SessionStats> {
  const allSessions = await getAllSessions()

  // filter sessions by date if filter is provided
  const sessions = dateFilter
    ? allSessions.filter((session) => {
        const created = new Date(session.time.created)
        return created >= dateFilter.from && created <= dateFilter.to
      })
    : allSessions

  const stats: SessionStats = {
    totalSessions: sessions.length,
    totalTokens: 0,
    totalCost: 0,
    activeDays: 0,
    longestStreak: 0,
    currentStreak: 0,
    longestSession: 0,
    peakHour: 12,
    modelUsage: {},
    dailyActivity: {},
    dailyCost: {},
    hourlyActivity: {},
    tokenBreakdown: {
      input: 0,
      output: 0,
      cacheRead: 0,
      cacheWrite: 0,
    },
    costBreakdown: {
      input: 0,
      output: 0,
      cacheRead: 0,
      cacheWrite: 0,
    },
    costPerDay: 0,
    costPerSession: 0,
  }

  if (sessions.length === 0) return stats

  const activeDaysSet = new Set<string>()

  for (const session of sessions) {
    const duration = session.time.updated - session.time.created
    if (duration > stats.longestSession) {
      stats.longestSession = duration
    }

    const dateKey = new Date(session.time.created).toISOString().split("T")[0]
    activeDaysSet.add(dateKey)

    const hour = new Date(session.time.created).getHours()
    stats.hourlyActivity[hour] = (stats.hourlyActivity[hour] || 0) + 1
  }

  // process messages in batches