prevent pinned notes to be cleaned up

src/main/java/com/lhamacorp/knotes/repository/PinRepository.java

@@ -9,6 +9,8 @@ public interface PinRepository extends MongoRepository<Pin, String> {
 
     List<Pin> findAllByUserId(String userId);
 
+    List<Pin> findAllByNoteId(String noteId);
+
     void deleteAllByNoteId(String noteId);
 
     void deletePinByUserIdAndNoteId(String noteId, String userId);

src/main/java/com/lhamacorp/knotes/service/CleanupScheduler.java

@@ -2,6 +2,7 @@ package com.lhamacorp.knotes.service;
 
 import com.lhamacorp.knotes.domain.Note;
 import com.lhamacorp.knotes.repository.NoteRepository;
+import com.lhamacorp.knotes.repository.PinRepository;
 import org.slf4j.Logger;
 import org.springframework.scheduling.annotation.Scheduled;
 import org.springframework.stereotype.Component;
@@ -15,27 +16,34 @@ import static org.slf4j.LoggerFactory.getLogger;
 @Component
 public class CleanupScheduler {
 
-    private final NoteRepository repository;
+    private final NoteRepository noteRepository;
+    private final PinRepository pinRepository;
 
     private static final String ONCE_PER_DAY_AT_2AM = "0 0 2 * * *";
     private static final Logger log = getLogger(CleanupScheduler.class);
 
-    public CleanupScheduler(NoteRepository repository) {
-        this.repository = repository;
+    public CleanupScheduler(NoteRepository noteRepository, PinRepository pinRepository) {
+        this.noteRepository = noteRepository;
+        this.pinRepository = pinRepository;
     }
 
     @Scheduled(cron = ONCE_PER_DAY_AT_2AM)
     public void cleanup() {
-        List<String> ids = repository.findEmptyNotes()
+        List<String> ids = noteRepository.findEmptyNotes()
                 .stream()
                 .filter(note -> note.createdAt().isBefore(now().minus(1, DAYS)))
                 .map(Note::id)
+                .filter(id -> !isPinned(id))
                 .toList();
 
         if (!ids.isEmpty()) {
             log.info("Cleaning empty notes [{}]", ids);
-            repository.deleteAllById(ids);
+            noteRepository.deleteAllById(ids);
         }
     }
 
+    private boolean isPinned(String noteId) {
+        return !pinRepository.findAllByNoteId(noteId).isEmpty();
+    }
+
 }