修正

backend/app/main.py

@@ -4,13 +4,15 @@ load_dotenv()
 from fastapi import FastAPI, Request
 from fastapi.responses import JSONResponse
 from pydantic import ValidationError
+from fastapi.middleware.cors import CORSMiddleware
+
 
 # FastAPI アプリケーション作成
 app = FastAPI(
     title="日本小規模企業向け会計システム"
 )
 
-from fastapi.middleware.cors import CORSMiddleware
+
 
 app.add_middleware(
     CORSMiddleware,
@@ -64,5 +66,7 @@ app.include_router(opening_balance_lock_router)
 from app.routers import journal_entries
 app.include_router(journal_entries.router)
 
+from app.routers import month_locks
+app.include_router(month_locks.router)