diff --git a/memento-note/app/api/ai/echo/connections/route.ts b/memento-note/app/api/ai/echo/connections/route.ts
index 326b7b7..60ae816 100644
--- a/memento-note/app/api/ai/echo/connections/route.ts
+++ b/memento-note/app/api/ai/echo/connections/route.ts
@@ -77,6 +77,7 @@ export async function GET(req: NextRequest) {
     })
 
   } catch (error) {
+    console.error('[/api/ai/echo/connections] error:', error)
     return NextResponse.json(
       { error: 'Failed to fetch connections' },
       { status: 500 }
diff --git a/memento-note/app/api/ai/echo/route.ts b/memento-note/app/api/ai/echo/route.ts
index 208a8f2..80d014c 100644
--- a/memento-note/app/api/ai/echo/route.ts
+++ b/memento-note/app/api/ai/echo/route.ts
@@ -32,6 +32,7 @@ export async function GET(req: NextRequest) {
     return NextResponse.json({ insight })
 
   } catch (error) {
+    console.error('[/api/ai/echo] GET error:', error)
     return NextResponse.json(
       { error: 'Failed to fetch Memory Echo insight' },
       { status: 500 }
@@ -84,6 +85,7 @@ export async function POST(req: NextRequest) {
     }
 
   } catch (error) {
+    console.error('[/api/ai/echo] POST error:', error)
     return NextResponse.json(
       { error: 'Failed to process request' },
       { status: 500 }
diff --git a/memento-note/middleware.ts b/memento-note/middleware.ts
index d409bb3..9158636 100644
--- a/memento-note/middleware.ts
+++ b/memento-note/middleware.ts
@@ -7,5 +7,5 @@ export default NextAuth(authConfig).auth;
 
 export const config = {
   // https://nextjs.org/docs/app/building-your-application/routing/middleware#matcher
-  matcher: ['/((?!api|_next/static|_next/image|.*\.png$).*)'],
+  matcher: ['/((?!api|_next/static|_next/image|uploads|.*\.(png|json|svg|ico|jpg|jpeg|webp|woff2?)$).*)'],
 };
\ No newline at end of file
diff --git a/memento-note/prisma/migrations/20260428150000_add_note_history/migration.sql b/memento-note/prisma/migrations/20260428150000_add_note_history/migration.sql
new file mode 100644
index 0000000..6b29101
--- /dev/null
+++ b/memento-note/prisma/migrations/20260428150000_add_note_history/migration.sql
@@ -0,0 +1,43 @@
+-- CreateTable
+CREATE TABLE "NoteHistory" (
+    "id" TEXT NOT NULL,
+    "noteId" TEXT NOT NULL,
+    "userId" TEXT NOT NULL,
+    "version" INTEGER NOT NULL,
+    "reason" TEXT,
+    "title" TEXT,
+    "content" TEXT NOT NULL,
+    "color" TEXT NOT NULL,
+    "isPinned" BOOLEAN NOT NULL,
+    "isArchived" BOOLEAN NOT NULL,
+    "type" TEXT NOT NULL,
+    "checkItems" TEXT,
+    "labels" TEXT,
+    "images" TEXT,
+    "links" TEXT,
+    "isMarkdown" BOOLEAN NOT NULL,
+    "size" TEXT NOT NULL,
+    "notebookId" TEXT,
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    CONSTRAINT "NoteHistory_pkey" PRIMARY KEY ("id")
+);
+
+-- AlterTable
+ALTER TABLE "UserAISettings"
+ADD COLUMN "noteHistory" BOOLEAN NOT NULL DEFAULT false;
+
+-- CreateIndex
+CREATE UNIQUE INDEX "NoteHistory_noteId_version_key" ON "NoteHistory"("noteId", "version");
+
+-- CreateIndex
+CREATE INDEX "NoteHistory_noteId_createdAt_idx" ON "NoteHistory"("noteId", "createdAt" DESC);
+
+-- CreateIndex
+CREATE INDEX "NoteHistory_userId_noteId_createdAt_idx" ON "NoteHistory"("userId", "noteId", "createdAt" DESC);
+
+-- AddForeignKey
+ALTER TABLE "NoteHistory" ADD CONSTRAINT "NoteHistory_noteId_fkey" FOREIGN KEY ("noteId") REFERENCES "Note"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "NoteHistory" ADD CONSTRAINT "NoteHistory_userId_fkey" FOREIGN KEY ("userId") REFERENCES "User"("id") ON DELETE CASCADE ON UPDATE CASCADE;