diff --git a/__tests__/db/couchdb-note-repository.error.test.js b/__tests__/db/couchdb-note-repository.error.test.js
index 01355a9..5b489a3 100644
--- a/__tests__/db/couchdb-note-repository.error.test.js
+++ b/__tests__/db/couchdb-note-repository.error.test.js
@@ -516,4 +516,81 @@ describe('CouchDbNoteRepository Error Scenarios', () => {
             expect(result).toEqual([]);
         });
     });
+
+    describe('Additional Coverage', () => {
+        test('init should log when updating existing design document with missing views', async () => {
+            const existingDoc = {
+                _id: '_design/notes',
+                _rev: '1-abc',
+                views: {
+                    all: { map: 'function(doc) { emit(doc._id, null); }' }
+                }
+            };
+
+            const mockDb = {
+                get: jest.fn().mockResolvedValue(existingDoc),
+                insert: jest.fn().mockResolvedValue({ ok: true })
+            };
+            const mockClient = {
+                db: {
+                    list: jest.fn().mockResolvedValue(['test_notes_error_db'])
+                },
+                use: jest.fn().mockReturnValue(mockDb)
+            };
+            
+            repository.client = mockClient;
+
+            const consoleSpy = jest.spyOn(console, 'log').mockImplementation(() => {});
+            await repository.init();
+            
+            expect(consoleSpy).toHaveBeenCalledWith('Updated design document with all views');
+            consoleSpy.mockRestore();
+        });
+
+        test('moveToRecycleBin should return false when insert throws 404', async () => {
+            const mockDb = {
+                get: jest.fn().mockResolvedValue({ _id: 'note1', _rev: '1-rev' }),
+                insert: jest.fn().mockRejectedValue({ statusCode: 404 })
+            };
+            repository.db = mockDb;
+
+            const result = await repository.moveToRecycleBin('note1');
+            expect(result).toBe(false);
+        });
+
+        test('restore should return false when insert throws 404', async () => {
+            const mockDb = {
+                get: jest.fn().mockResolvedValue({ _id: 'note1', _rev: '1-rev' }),
+                insert: jest.fn().mockRejectedValue({ statusCode: 404 })
+            };
+            repository.db = mockDb;
+
+            const result = await repository.restore('note1');
+            expect(result).toBe(false);
+        });
+
+        test('permanentDelete should return false when destroy throws 404', async () => {
+            const mockDb = {
+                get: jest.fn().mockResolvedValue({ _id: 'note1', _rev: '1-rev' }),
+                destroy: jest.fn().mockRejectedValue({ statusCode: 404 })
+            };
+            repository.db = mockDb;
+
+            const result = await repository.permanentDelete('note1');
+            expect(result).toBe(false);
+        });
+
+        test('restoreAll should handle errors', async () => {
+            repository.findDeleted = jest.fn().mockRejectedValue(new Error('findDeleted failed'));
+            await expect(repository.restoreAll()).rejects.toThrow('findDeleted failed');
+        });
+
+        test('countDeleted should handle errors', async () => {
+            const mockDb = {
+                view: jest.fn().mockRejectedValue(new Error('view failed'))
+            };
+            repository.db = mockDb;
+            await expect(repository.countDeleted()).rejects.toThrow('view failed');
+        });
+    });
 });
diff --git a/__tests__/db/extra-coverage.test.js b/__tests__/db/extra-coverage.test.js
new file mode 100644
index 0000000..39ec09b
--- /dev/null
+++ b/__tests__/db/extra-coverage.test.js
@@ -0,0 +1,46 @@
+import { jest } from '@jest/globals';
+import { NoteRepository } from '../../src/db/note-repository.js';
+import * as apiServer from '../../src/notes-api-server.js';
+
+describe('Extra Coverage Tests', () => {
+    describe('NoteRepository Base Class', () => {
+        const repo = new NoteRepository();
+        const methods = [
+            'findAll', 'findDeleted', 'findAllIncludingDeleted', 'findById',
+            'create', 'update', 'moveToRecycleBin', 'restore', 'permanentDelete',
+            'emptyRecycleBin', 'restoreAll', 'countDeleted'
+        ];
+
+        test.each(methods)('%s should throw Method not implemented', async (method) => {
+            await expect(repo[method]()).rejects.toThrow('Method not implemented');
+        });
+    });
+
+    describe('API Server Backward Compatibility Exports', () => {
+        test('should export app', () => {
+            expect(apiServer.app).toBeDefined();
+        });
+
+        test('should export createNoteRepository', () => {
+            expect(typeof apiServer.createNoteRepository).toBe('function');
+        });
+
+        test('should export gracefulShutdown', () => {
+            expect(typeof apiServer.gracefulShutdown).toBe('function');
+        });
+
+        test('should export initializeApp', async () => {
+            expect(typeof apiServer.initializeApp).toBe('function');
+            // Mock repository to avoid real DB connection
+            const mockRepo = {
+                init: jest.fn().mockResolvedValue()
+            };
+            const result = await apiServer.initializeApp(mockRepo);
+            expect(result.repository).toBe(mockRepo);
+        });
+
+        test('should export startServer', () => {
+            expect(typeof apiServer.startServer).toBe('function');
+        });
+    });
+});
diff --git a/__tests__/db/mongodb-note-repository.error.test.js b/__tests__/db/mongodb-note-repository.error.test.js
index 94323f2..9f3f484 100644
--- a/__tests__/db/mongodb-note-repository.error.test.js
+++ b/__tests__/db/mongodb-note-repository.error.test.js
@@ -417,5 +417,36 @@ describe('MongoDbNoteRepository Error Handling Tests', () => {
             await expect(repository.countDeleted()).rejects.toThrow('No connection to database');
             expect(console.error).toHaveBeenCalledWith('Failed to count deleted notes:', expect.any(Error));
         });
+
+        test('should handle restoreAll database errors', async () => {
+            repository.NoteModel.updateMany = jest.fn().mockRejectedValue(new Error('Update failed'));
+            await expect(repository.restoreAll()).rejects.toThrow('Update failed');
+            expect(console.error).toHaveBeenCalledWith('Failed to restore all notes from recycle bin:', expect.any(Error));
+        });
+
+        test('should handle emptyRecycleBin database errors', async () => {
+            repository.NoteModel.deleteMany = jest.fn().mockRejectedValue(new Error('Delete failed'));
+            await expect(repository.emptyRecycleBin()).rejects.toThrow('Delete failed');
+            expect(console.error).toHaveBeenCalledWith('Failed to empty recycle bin:', expect.any(Error));
+        });
+
+        test('init should not re-create model if it exists', async () => {
+            mongoose.connect = jest.fn().mockResolvedValue();
+            repository.NoteModel = { some: 'model' };
+            await repository.init();
+            expect(repository.NoteModel).toEqual({ some: 'model' });
+        });
+
+        test('restoreAll should return 0 if no notes modified', async () => {
+            repository.NoteModel.updateMany = jest.fn().mockResolvedValue({ modifiedCount: 0 });
+            const result = await repository.restoreAll();
+            expect(result).toBe(0);
+        });
+
+        test('emptyRecycleBin should return 0 if no notes deleted', async () => {
+            repository.NoteModel.deleteMany = jest.fn().mockResolvedValue({ deletedCount: 0 });
+            const result = await repository.emptyRecycleBin();
+            expect(result).toBe(0);
+        });
     });
-}); 
\ No newline at end of file
+});
\ No newline at end of file