handlers

type HeartbeatView struct {
	ID              string
	Status          string
	Description     string
	Interval        string
	IntervalSeconds float64 // for table sorting
	Grace           string
	GraceSeconds    float64 // for table sorting
	LastBump        time.Time
	URL             string // full URL to copy
	Receivers       []string
	HasHistory      bool
}

type HistoryView struct {
	Timestamp   time.Time
	Type        string // EventType
	HeartbeatID string
	Details     string // e.g. "Notification Sent", "old → new", or blank
}

type ReceiverView struct {
	ID          string // receiver ID
	Type        string // "slack", "email", etc.
	Destination string // e.g. channel name, email addrs
	LastSent    time.Time
	LastErr     error
}