feat(store): SaveProgress and Heartbeat; Get returns the phases and both timestamps (ADR-035)

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

internal/adapters/store/uploaded_transcripts.go

@@ -68,6 +68,26 @@ func (s *Store) CompleteUpload(ctx context.Context, userID, id string, t domain.
 		t.Text, segs, t.Endpoint, t.AudioSeconds, rec)
 }
 
+// SaveProgress records the job's phases and when something last really changed
+// (ADR-035). It replaces the previous snapshot: the Tracker holds the whole plan.
+func (s *Store) SaveProgress(ctx context.Context, userID, id string, steps []domain.ProgressStep, at time.Time) error {
+	b, err := json.Marshal(steps)
+	if err != nil {
+		return fmt.Errorf("store: save progress: marshal: %w", err)
+	}
+	return s.updateUpload(ctx, userID, id, "save progress",
+		`UPDATE uploaded_transcripts SET progress = $3, progress_at = $4
+		  WHERE id = $1 AND user_id = $2`, b, at)
+}
+
+// Heartbeat stamps the upload as alive now. It does not touch progress_at: alive says
+// the service is still reporting, not that work is moving (ADR-035).
+func (s *Store) Heartbeat(ctx context.Context, userID, id string) error {
+	return s.updateUpload(ctx, userID, id, "heartbeat",
+		`UPDATE uploaded_transcripts SET alive_at = NOW()
+		  WHERE id = $1 AND user_id = $2`)
+}
+
 // FailUpload moves an upload to failed with a typed reason.
 func (s *Store) FailUpload(ctx context.Context, userID, id string, kind domain.UploadErrorKind) error {
 	return s.updateUpload(ctx, userID, id, "fail upload",
@@ -165,19 +185,21 @@ func (s *Store) FailInterruptedUploads(ctx context.Context) (int, error) {
 }
 
 const uploadSelect = `SELECT id, user_id, title, status, content, segments, endpoint,
-       audio_seconds, error_kind, had_video, reconciliation, created_at, finished_at FROM uploaded_transcripts`
+       audio_seconds, error_kind, had_video, reconciliation, progress, progress_at, alive_at,
+       created_at, finished_at FROM uploaded_transcripts`
 
 // scanUpload scans one uploadSelect row. withText controls whether the transcript
 // body and segments are kept (GetUpload) or dropped (ListUploads).
 func scanUpload(row pgx.Row, u *domain.UploadedTranscript, withText bool) error {
 	var (
 		status, errKind, endpoint, content *string
-		segments, reconciliation           []byte
+		segments, reconciliation, progress []byte
 		seconds                            *float64
-		finished                           *time.Time
+		finished, progressAt, aliveAt      *time.Time
 	)
 	if err := row.Scan(&u.ID, &u.UserID, &u.Title, &status, &content, &segments, &endpoint,
-		&seconds, &errKind, &u.HadVideo, &reconciliation, &u.CreatedAt, &finished); err != nil {
+		&seconds, &errKind, &u.HadVideo, &reconciliation, &progress, &progressAt, &aliveAt,
+		&u.CreatedAt, &finished); err != nil {
 		return err
 	}
 	u.Status = domain.UploadStatus(deref(status))
@@ -192,6 +214,17 @@ func scanUpload(row pgx.Row, u *domain.UploadedTranscript, withText bool) error
 	if !withText {
 		return nil
 	}
+	if len(progress) > 0 {
+		if err := json.Unmarshal(progress, &u.Progress); err != nil {
+			return fmt.Errorf("unmarshal progress: %w", err)
+		}
+	}
+	if progressAt != nil {
+		u.ProgressAt = *progressAt
+	}
+	if aliveAt != nil {
+		u.AliveAt = *aliveAt
+	}
 	if len(reconciliation) > 0 {
 		var r domain.Reconciliation
 		if err := json.Unmarshal(reconciliation, &r); err != nil {