修正

backend/app/modules/journals/schemas.py

@@ -0,0 +1,29 @@
+# app/modules/journals/schemas.py
+from pydantic import BaseModel, field_validator
+from typing import List
+from decimal import Decimal
+from datetime import date
+
+class JournalLineCreate(BaseModel):
+    account_id: int
+    debit: Decimal = 0
+    credit: Decimal = 0
+
+    @field_validator("debit", "credit")
+    @classmethod
+    def non_negative(cls, v):
+        if v < 0:
+            raise ValueError("金額は0以上で入力してください")
+        return v
+
+class JournalCreate(BaseModel):
+    journal_date: date
+    description: str
+    lines: List[JournalLineCreate]
+
+    @field_validator("lines")
+    @classmethod
+    def validate_lines(cls, v):
+        if len(v) < 2:
+            raise ValueError("仕訳明細は2行以上必要です")
+        return v