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index 2d07db3..084fd92 100644
--- a/backend/.venv/pyvenv.cfg
+++ b/backend/.venv/pyvenv.cfg
@@ -1,5 +1,5 @@
-home = C:\Users\zxh_y\AppData\Local\Programs\Python\Python312
+home = C:\Users\choshoukaku\AppData\Local\Programs\Python\Python312
 include-system-site-packages = false
 version = 3.12.9
-executable = C:\Users\zxh_y\AppData\Local\Programs\Python\Python312\python.exe
-command = C:\Users\zxh_y\AppData\Local\Programs\Python\Python312\python.exe -m venv C:\workspace\njts-accounting-core\backend\.venv
+executable = C:\Users\choshoukaku\AppData\Local\Programs\Python\Python312\python.exe
+command = C:\Users\choshoukaku\AppData\Local\Programs\Python\Python312\python.exe -m venv C:\workspace\njts-accounting-core\backend\.venv
diff --git a/backend/app/__pycache__/__init__.cpython-312.pyc b/backend/app/__pycache__/__init__.cpython-312.pyc
index 9ecfe6a..49e3533 100644
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diff --git a/backend/app/__pycache__/main.cpython-312.pyc b/backend/app/__pycache__/main.cpython-312.pyc
index 1c78063..8c1b95b 100644
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diff --git a/backend/app/core/__pycache__/__init__.cpython-312.pyc b/backend/app/core/__pycache__/__init__.cpython-312.pyc
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diff --git a/backend/app/core/__pycache__/database.cpython-312.pyc b/backend/app/core/__pycache__/database.cpython-312.pyc
index 8bf5869..13e71bd 100644
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diff --git a/backend/app/core/__pycache__/exceptions.cpython-312.pyc b/backend/app/core/__pycache__/exceptions.cpython-312.pyc
new file mode 100644
index 0000000..8c21634
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diff --git a/backend/app/core/exceptions.py b/backend/app/core/exceptions.py
new file mode 100644
index 0000000..a6ea01a
--- /dev/null
+++ b/backend/app/core/exceptions.py
@@ -0,0 +1,11 @@
+from fastapi import HTTPException
+
+class BusinessException(HTTPException):
+    def __init__(self, error_code: str, message: str):
+        super().__init__(
+            status_code=400,
+            detail={
+                "error_code": error_code,
+                "message": message
+            }
+        )
diff --git a/backend/app/modules/__pycache__/__init__.cpython-312.pyc b/backend/app/modules/__pycache__/__init__.cpython-312.pyc
index 883e502..29617c1 100644
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diff --git a/backend/app/modules/accounts/__pycache__/__init__.cpython-312.pyc b/backend/app/modules/accounts/__pycache__/__init__.cpython-312.pyc
index cf6d9ff..866a651 100644
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diff --git a/backend/app/modules/accounts/__pycache__/router.cpython-312.pyc b/backend/app/modules/accounts/__pycache__/router.cpython-312.pyc
index 133ca89..28f5118 100644
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diff --git a/backend/app/modules/accounts/router.py b/backend/app/modules/accounts/router.py
index f789197..b5cc985 100644
--- a/backend/app/modules/accounts/router.py
+++ b/backend/app/modules/accounts/router.py
@@ -1,11 +1,18 @@
-from fastapi import APIRouter, HTTPException
+from fastapi import APIRouter
 from pydantic import BaseModel, field_validator
 from enum import Enum
 from psycopg.errors import UniqueViolation, CheckViolation, StringDataRightTruncation
 from app.core.database import get_connection
+from app.core.exceptions import BusinessException
+import psycopg
+
 
 router = APIRouter(prefix="/accounts", tags=["科目マスタ"])
 
+
+# ======================================================
+# Enum：科目種別
+# ======================================================
 class AccountType(str, Enum):
     asset = "asset"
     liability = "liability"
@@ -13,6 +20,10 @@ class AccountType(str, Enum):
     revenue = "revenue"
     expense = "expense"
 
+
+# ======================================================
+# Model：登録入力用
+# ======================================================
 class AccountCreate(BaseModel):
     account_code: str
     account_name: str
@@ -22,45 +33,86 @@ class AccountCreate(BaseModel):
     @classmethod
     def validate_code(cls, v: str):
         if not v.isdigit():
-            raise ValueError("科目コードは数字のみで入力してください")
+            raise BusinessException(
+                error_code="ACCOUNT_CODE_INVALID",
+                message="科目コードは数字のみで入力してください"
+            )
         if len(v) > 20:
-            raise ValueError("科目コードが長すぎます（20文字以内）")
+            raise BusinessException(
+                error_code="ACCOUNT_CODE_TOO_LONG",
+                message="科目コードは20文字以内で入力してください"
+            )
         return v
 
     @field_validator("account_name")
     @classmethod
     def validate_name(cls, v: str):
         if not v.strip():
-            raise ValueError("科目名を入力してください")
+            raise BusinessException(
+                error_code="ACCOUNT_NAME_EMPTY",
+                message="科目名を入力してください"
+            )
         if len(v) > 100:
-            raise ValueError("科目名が長すぎます（100文字以内）")
+            raise BusinessException(
+                error_code="ACCOUNT_NAME_TOO_LONG",
+                message="科目名は100文字以内で入力してください"
+            )
         return v
 
+
+# ======================================================
+# GET：科目一覧取得
+# ======================================================
 @router.get("/", summary="科目一覧取得")
 def list_accounts():
     with get_connection() as conn, conn.cursor() as cur:
         cur.execute("""
             SELECT account_id, account_code, account_name, account_type, is_active
-            FROM accounts ORDER BY account_code
+            FROM accounts
+            ORDER BY account_code
         """)
-        return cur.fetchall()
+        rows = cur.fetchall()
 
+        if not rows:
+            raise BusinessException(
+                error_code="ACCOUNT_NOT_FOUND",
+                message="科目が登録されていません"
+            )
+
+        return rows
+
+
+# ======================================================
+# POST：科目登録
+# ======================================================
 @router.post("/", summary="科目登録", status_code=201)
 def create_account(data: AccountCreate):
     try:
         with get_connection() as conn, conn.cursor() as cur:
             cur.execute("""
                 INSERT INTO accounts (account_code, account_name, account_type)
-                VALUES (%s, %s, %s) RETURNING account_id
+                VALUES (%s, %s, %s)
+                RETURNING account_id
             """, (data.account_code, data.account_name, data.account_type.value))
+
             new_id = cur.fetchone()["account_id"]
             conn.commit()
             return {"account_id": new_id}
 
     except UniqueViolation:
-        # 409 也行；这里按你的要求统一 400
-        raise HTTPException(status_code=400, detail="この科目コードは既に登録されています。")
+        raise BusinessException(
+            error_code="ACCOUNT_DUPLICATE",
+            message="この科目コードは既に登録されています"
+        )
+
     except StringDataRightTruncation:
-        raise HTTPException(status_code=400, detail="入力文字数が制限を超えています。")
+        raise BusinessException(
+            error_code="ACCOUNT_VALUE_TOO_LONG",
+            message="入力文字数が制限を超えています"
+        )
+
     except CheckViolation:
-        raise HTTPException(status_code=400, detail="入力値が不正です。")
+        raise BusinessException(
+            error_code="ACCOUNT_VALUE_INVALID",
+            message="入力値が不正です"
+        )
diff --git a/backend/app/modules/journals/__pycache__/__init__.cpython-312.pyc b/backend/app/modules/journals/__pycache__/__init__.cpython-312.pyc
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diff --git a/backend/app/modules/ledger/__pycache__/__init__.cpython-312.pyc b/backend/app/modules/ledger/__pycache__/__init__.cpython-312.pyc
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diff --git a/backend/app/modules/trial_balance/__pycache__/__init__.cpython-312.pyc b/backend/app/modules/trial_balance/__pycache__/__init__.cpython-312.pyc
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diff --git a/backend/app/modules/trial_balance/__pycache__/router.cpython-312.pyc b/backend/app/modules/trial_balance/__pycache__/router.cpython-312.pyc
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diff --git a/メモ.txt b/メモ.txt
new file mode 100644
index 0000000..91396c5
--- /dev/null
+++ b/メモ.txt
@@ -0,0 +1,94 @@
+重新 build
+sam build --no-cached
+
+启动本地 API：
+sam local start-api
+
+
+C:\workspace\AWS\accounting-system\layers\psycopg2\python
+
+
+如果你看到的是：
+bash-4.2#
+→ 这是 Amazon Linux 容器（正确）
+你必须看到 bash-4.2# 才能执行 yum。
+
+
+
+正确的データベース Host 是你的 NAS 内网 IP 地址
+
+Host: 192.168.0.61
+Port: 55432
+User: postgres
+Password: accounting123
+Database: accounting   njts_acct
+
+
+DB_HOST=192.168.0.61
+DB_PORT=55432
+DB_NAME=njts_acct
+DB_USER=njts_app
+DB_PASSWORD=njts_app2025
+
+----------------------
+バージョン確認
+python --version
+
+pip --version
+
+where python
+
+where python 没有输出
+
+这是好事，不是坏事：
+
+说明：
+
+没有多个 python 冲突
+
+没有 WindowsApps / Microsoft Store 干扰
+
+PowerShell 里 python 能正常执行，PATH 已经是正确的
+
+👉 结论：Python 环境 = 教科书级干净
+
+
+create_njts_accounting_core.bat
+
+cd C:\workspace\njts-accounting-core\backend
+
+python -m venv .venv
+
+cd C:\workspace\njts-accounting-core\backend
+.venv\Scripts\activate
+
+
+backend\requirements.txt
+ーーーーーーーーーーーーー
+fastapi==0.115.6
+uvicorn[standard]==0.32.1
+ーーーーーーーーーーーー
+
+pip install -r requirements.txt
+
+
+backend\app\main.py
+ーーーーーーーーーー
+from fastapi import FastAPI
+
+app = FastAPI(
+    title="NJTS Accounting Core API",
+    description="日本小規模企業向け 会計システム",
+    version="0.1.0"
+)
+
+@app.get("/")
+def root():
+    return {
+        "message": "NJTS Accounting Core API is running",
+        "status": "ok"
+    }
+
+
+
+pip install psycopg[binary]==3.2.3
\ No newline at end of file