diff --git a/internal/server/server.go b/internal/server/server.go
index 73d9ff8e..af477ac3 100644
--- a/internal/server/server.go
+++ b/internal/server/server.go
@@ -52,9 +52,11 @@ func (a lidarrUnmonitorAdapter) UnmonitorTrack(ctx context.Context, trackMbid, a
 }
 
 // ScanTrigger is the subset of the scanner the HTTP handler needs. Kept as an
-// interface so tests can stub it without touching the DB.
+// interface so tests can stub it without touching the DB. The progressCb
+// parameter (added in m7-scan-progress) lets the orchestrator drive partial-
+// tally writes; the HTTP handler passes nil for fire-and-forget triggers.
 type ScanTrigger interface {
-	Scan(ctx context.Context) (library.Stats, error)
+	Scan(ctx context.Context, progressCb func(library.Stats)) (library.Stats, error)
 }
 
 type Server struct {
@@ -151,7 +153,7 @@ func (s *Server) handleHealthz(w http.ResponseWriter, _ *http.Request) {
 // Kept synchronous for v1: libraries are small and the operator can tell when
 // it's done. Async jobs with status polling are a later-milestone concern.
 func (s *Server) handleAdminScan(w http.ResponseWriter, r *http.Request) {
-	stats, err := s.Scanner.Scan(r.Context())
+	stats, err := s.Scanner.Scan(r.Context(), nil)
 	w.Header().Set("Content-Type", "application/json")
 	if err != nil {
 		s.Logger.Error("admin scan failed", "err", err)
diff --git a/internal/server/server_test.go b/internal/server/server_test.go
index a36db94f..e2f35947 100644
--- a/internal/server/server_test.go
+++ b/internal/server/server_test.go
@@ -247,6 +247,6 @@ func TestRouter_AdminSubtreeNotShadowed(t *testing.T) {
 // route-presence assertions in this file.
 type stubScanner struct{}
 
-func (stubScanner) Scan(_ context.Context) (library.Stats, error) {
+func (stubScanner) Scan(_ context.Context, _ func(library.Stats)) (library.Stats, error) {
 	panic("stubScanner.Scan called from server_test")
 }