feat(library): trigger scan after successful library deletion to clean up orphaned data

Signed-off-by: Deluan <deluan@navidrome.org>

core/library.go

@@ -208,8 +208,32 @@ func (r *libraryRepositoryWrapper) Delete(id string) error {
 		}}
 	}
 
+	// Get library info before deletion for logging
+	lib, err := r.Get(libID)
+	if err != nil {
+		return r.mapError(err)
+	}
+
 	err = r.LibraryRepository.Delete(libID)
-	return r.mapError(err)
+	if err != nil {
+		return r.mapError(err)
+	}
+
+	// Trigger scan after successful library deletion to clean up orphaned data
+	if r.scanner != nil {
+		go func() {
+			log.Info(r.ctx, "Triggering scan after library deletion", "libraryID", lib.ID, "name", lib.Name, "path", lib.Path)
+			start := time.Now()
+			warnings, err := r.scanner.ScanAll(r.ctx, false) // Quick scan to clean up orphaned data
+			if err != nil {
+				log.Error(r.ctx, "Error scanning after library deletion", "libraryID", lib.ID, "name", lib.Name, err)
+			} else {
+				log.Info(r.ctx, "Scan completed after library deletion", "libraryID", lib.ID, "name", lib.Name, "warnings", len(warnings), "elapsed", time.Since(start))
+			}
+		}()
+	}
+
+	return nil
 }
 
 // Helper methods

core/library_test.go

@@ -701,5 +701,35 @@ var _ = Describe("Library Service", func() {
 				return len(scanner.ScanCalls)
 			}, "100ms", "10ms").Should(Equal(0))
 		})
+
+		It("triggers scan when deleting a library", func() {
+			// First create a library
+			libraryRepo.SetData(model.Libraries{
+				{ID: 1, Name: "Library to Delete", Path: tempDir},
+			})
+
+			// Delete the library
+			err := repo.Delete("1")
+			Expect(err).NotTo(HaveOccurred())
+
+			// Wait briefly for the goroutine to complete
+			Eventually(func() int {
+				return len(scanner.ScanCalls)
+			}, "1s", "10ms").Should(Equal(1))
+
+			// Verify scan was called with correct parameters
+			Expect(scanner.ScanCalls[0].FullScan).To(BeFalse()) // Should be quick scan
+		})
+
+		It("does not trigger scan when library deletion fails", func() {
+			// Try to delete a non-existent library
+			err := repo.Delete("999")
+			Expect(err).To(HaveOccurred())
+
+			// Ensure no scan was triggered since deletion failed
+			Consistently(func() int {
+				return len(scanner.ScanCalls)
+			}, "100ms", "10ms").Should(Equal(0))
+		})
 	})
 })