diff --git a/src/main/db/migrations/m008_notebooks.ts b/src/main/db/migrations/m008_notebooks.ts
index dcc982f..14641ec 100644
--- a/src/main/db/migrations/m008_notebooks.ts
+++ b/src/main/db/migrations/m008_notebooks.ts
@@ -19,7 +19,7 @@ export function up(db: Database.Database): void {
       created_at TEXT NOT NULL,
       updated_at TEXT NOT NULL
     );
-    CREATE UNIQUE INDEX idx_notebooks_name ON notebooks(name);
+    CREATE UNIQUE INDEX idx_notebooks_name ON notebooks(name COLLATE NOCASE);
 
     ALTER TABLE notes ADD COLUMN notebook_id TEXT
       REFERENCES notebooks(id) ON DELETE RESTRICT;
diff --git a/tests/unit/m008.test.ts b/tests/unit/m008.test.ts
index 588b595..e6699a5 100644
--- a/tests/unit/m008.test.ts
+++ b/tests/unit/m008.test.ts
@@ -1,6 +1,25 @@
 import { describe, it, expect, beforeEach, afterEach } from 'vitest';
 import Database from 'better-sqlite3';
 import { runMigrations } from '../../src/main/db/migrations/index.js';
+import * as m001 from '../../src/main/db/migrations/m001_initial.js';
+import * as m002 from '../../src/main/db/migrations/m002_due_date.js';
+import * as m003 from '../../src/main/db/migrations/m003_soft_delete.js';
+import * as m004 from '../../src/main/db/migrations/m004_status.js';
+import * as m005 from '../../src/main/db/migrations/m005_ai_disabled.js';
+import * as m006 from '../../src/main/db/migrations/m006_revisions.js';
+import * as m007 from '../../src/main/db/migrations/m007_fts.js';
+
+/** m001~m007 을 수동 적용하고 user_version=7 로 설정 (m008 만 미적용 상태) */
+function applyUpTo7(db: Database.Database): void {
+  m001.up(db);
+  m002.up(db);
+  m003.up(db);
+  m004.up(db);
+  m005.up(db);
+  m006.up(db);
+  m007.up(db);
+  db.pragma('user_version = 7');
+}
 
 describe('m008 notebooks migration', () => {
   let db: Database.Database;
@@ -13,17 +32,32 @@ describe('m008 notebooks migration', () => {
     expect(row.name).toBe('기본');
   });
 
-  it('기존 notes 가 default notebook 으로 마이그레이션 — fresh insert 는 NULL 유지', () => {
+  it('fresh insert 는 notebook_id NULL 유지 (migration UPDATE 는 migration 시점 행만 채움)', () => {
     runMigrations(db);
-    const defaultId = (db.prepare(`SELECT id FROM notebooks`).get() as { id: string }).id;
     db.prepare(`INSERT INTO notes(id,raw_text,ai_status,created_at,updated_at,status) VALUES('n1','t','pending','2026-05-14','2026-05-14','active')`).run();
     const r = db.prepare(`SELECT notebook_id FROM notes WHERE id='n1'`).get() as { notebook_id: string | null };
     expect(r.notebook_id).toBeNull();  // m008 의 UPDATE 는 migration 시점의 NULL 만 채움
   });
 
-  it('archived 잔류 노트가 있다면 completed 로 통합', () => {
+  it('pre-migration 노트가 runMigrations 후 default notebook 으로 backfill 됨', () => {
+    applyUpTo7(db);
+    // m008 적용 전 상태에서 노트 삽입 (notebook_id 컬럼 없음)
+    db.prepare(`INSERT INTO notes(id,raw_text,ai_status,created_at,updated_at,status) VALUES('pre1','hello','pending','2026-05-14','2026-05-14','active')`).run();
+    // m008 만 적용
     runMigrations(db);
-    expect(() => db.prepare(`SELECT COUNT(*) FROM notes WHERE status='archived'`).get()).not.toThrow();
+    const defaultId = (db.prepare(`SELECT id FROM notebooks`).get() as { id: string }).id;
+    const r = db.prepare(`SELECT notebook_id FROM notes WHERE id='pre1'`).get() as { notebook_id: string | null };
+    expect(r.notebook_id).toBe(defaultId);
+  });
+
+  it('pre-migration archived 노트가 runMigrations 후 completed 로 변환됨', () => {
+    applyUpTo7(db);
+    // m008 적용 전 상태에서 archived 노트 삽입
+    db.prepare(`INSERT INTO notes(id,raw_text,ai_status,created_at,updated_at,status) VALUES('arc1','bye','pending','2026-05-14','2026-05-14','archived')`).run();
+    // m008 만 적용
+    runMigrations(db);
+    const r = db.prepare(`SELECT status FROM notes WHERE id='arc1'`).get() as { status: string };
+    expect(r.status).toBe('completed');
   });
 
   it('UNIQUE index 가 같은 이름 중복 INSERT 거부', () => {
@@ -32,4 +66,13 @@ describe('m008 notebooks migration', () => {
       db.prepare(`INSERT INTO notebooks(id,name,created_at,updated_at) VALUES('x','기본','t','t')`).run()
     ).toThrow();
   });
+
+  it('UNIQUE index 가 대소문자 다른 이름도 중복으로 거부 (COLLATE NOCASE)', () => {
+    runMigrations(db);
+    // 영문 notebook 추가 후 대소문자 변형 삽입 시도
+    db.prepare(`INSERT INTO notebooks(id,name,created_at,updated_at) VALUES('nb1','Default','t','t')`).run();
+    expect(() =>
+      db.prepare(`INSERT INTO notebooks(id,name,created_at,updated_at) VALUES('nb2','default','t','t')`).run()
+    ).toThrow();
+  });
 });