stats

type DayStat struct {
	Day   string // YYYY-MM-DD
	Count int
}

type ProjectStat struct {
	Path  string
	Count int
}

type Stats struct {
	Total      int
	Parsed     int // sessions whose metadata parsed (have a thread id)
	Compressed int
	Archived   int
	NoCWD      int
	TotalBytes int64
	First      time.Time // earliest last-activity
	Last       time.Time // latest last-activity
	Projects   []ProjectStat
	Days       []DayStat
}