fix: separate live archive snapshots

Parse and expose SessionStatus from the official live feed, treating Started/Resumed as active and terminal or missing statuses as inactive archive candidates.

Keep /api/v1/live/state and SSE snapshot data reserved for active sessions while exposing memory-only last_snapshot, last_positions, and last_snapshot_at for the explicit Live tab archive view.

internal/live/parser_test.go

@@ -273,6 +273,40 @@ func TestProcessTopicTrackStatus(t *testing.T) {
 	}
 }
 
+func TestProcessTopicSessionStatus(t *testing.T) {
+	state := live.NewState()
+	if !state.ProcessTopic("SessionStatus", json.RawMessage(`{"Status": "Finished"}`)) {
+		t.Fatal("SessionStatus should update state")
+	}
+	snap := state.Snapshot()
+	if snap.SessionStatus != "Finished" {
+		t.Fatalf("session status = %q, want Finished", snap.SessionStatus)
+	}
+	if !snap.SnapshotUpdated {
+		t.Fatal("SessionStatus should mark snapshot updated")
+	}
+}
+
+func TestSessionStatusIsActive(t *testing.T) {
+	tests := []struct {
+		status string
+		want   bool
+	}{
+		{"Started", true},
+		{"Resumed", true},
+		{"Finished", false},
+		{"Finalised", false},
+		{"Ends", false},
+		{"Aborted", false},
+		{"", false},
+	}
+	for _, tt := range tests {
+		if got := live.SessionStatusIsActive(tt.status); got != tt.want {
+			t.Errorf("SessionStatusIsActive(%q) = %v, want %v", tt.status, got, tt.want)
+		}
+	}
+}
+
 func TestProcessTopicRaceControlMessages(t *testing.T) {
 	state := live.NewState()
 	data := json.RawMessage(`{

internal/live/signalr.go

@@ -197,7 +197,7 @@ func connectToF1LegacySignalR(dataChan chan LiveStreamData) error {
 		return err
 	}
 
-	subscribeMsg := []byte(`{"H":"Streaming","M":"Subscribe","A":[["Heartbeat","TimingData","Position.z","CarData.z","DriverList","LapCount","ExtrapolatedClock","TrackStatus","RaceControlMessages","WeatherData","SessionInfo","TeamRadio","CurrentTyres","TimingAppData","TimingStats"]],"I":1}`)
+	subscribeMsg := []byte(`{"H":"Streaming","M":"Subscribe","A":[["Heartbeat","TimingData","Position.z","CarData.z","DriverList","LapCount","ExtrapolatedClock","TrackStatus","RaceControlMessages","WeatherData","SessionInfo","TeamRadio","CurrentTyres","TimingAppData","TimingStats","SessionStatus"]],"I":1}`)
 	err = c.WriteMessage(websocket.TextMessage, subscribeMsg)
 	if err != nil {
 		return err

internal/live/state.go

@@ -26,6 +26,7 @@ type State struct {
 	Weather            LiveWeatherData
 	Session            LiveSessionMeta
 	TeamRadio          []LiveRadioCapture
+	SessionStatus      string
 	TrackStatus        string
 	CurrentLap         int
 	TotalLaps          int
@@ -93,6 +94,7 @@ func (s *State) Snapshot() LiveStreamData {
 		Weather:            s.Weather,
 		Session:            s.Session,
 		TeamRadio:          cpyRadio,
+		SessionStatus:      s.SessionStatus,
 		TrackStatus:        s.TrackStatus,
 		CurrentLap:         s.CurrentLap,
 		TotalLaps:          s.TotalLaps,
@@ -273,6 +275,14 @@ func (s *State) ProcessTopic(topic string, data json.RawMessage) bool {
 			s.TrackStatus = ts.Status
 			updated = true
 		}
+	case "SessionStatus":
+		var ss struct {
+			Status string `json:"Status"`
+		}
+		if json.Unmarshal(data, &ss) == nil && ss.Status != "" {
+			s.SessionStatus = ss.Status
+			updated = true
+		}
 	case "RaceControlMessages":
 		var rcm struct {
 			Messages json.RawMessage `json:"Messages"`

internal/live/types.go

@@ -162,6 +162,7 @@ type LiveStreamData struct {
 	Weather            LiveWeatherData
 	Session            LiveSessionMeta
 	TeamRadio          []LiveRadioCapture
+	SessionStatus      string
 	TrackStatus        string // "1"=green "2"=yellow "4"=SC "5"=red "6"=VSC
 	CurrentLap         int
 	TotalLaps          int
@@ -173,3 +174,27 @@ type LiveStreamData struct {
 	PositionUpdated    bool                        `json:"-"`
 	SnapshotUpdated    bool                        `json:"-"`
 }
+
+// SessionStatusIsActive reports whether a raw F1 live timing SessionStatus
+// value represents an actively running session.
+func SessionStatusIsActive(status string) bool {
+	switch normalizeSessionStatus(status) {
+	case "started", "resumed":
+		return true
+	default:
+		return false
+	}
+}
+
+func normalizeSessionStatus(status string) string {
+	out := make([]rune, 0, len(status))
+	for _, r := range status {
+		switch {
+		case r >= 'A' && r <= 'Z':
+			out = append(out, r+'a'-'A')
+		case r >= 'a' && r <= 'z', r >= '0' && r <= '9':
+			out = append(out, r)
+		}
+	}
+	return string(out)
+}