first sketch; incomplete; WiP

src/models/transactions.py

@@ -5,7 +5,7 @@ from pydantic import Field, computed_field
 from sqlalchemy import Date, ForeignKey, Index, Integer, String, UniqueConstraint
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 
-from src.models.common import ExportBaseModel, IngestdbBase, date2str, hashify
+from src.models.common import Amount, ExportBaseModel, IngestdbBase, date2str, hashify
 
 
 class Transaction(ExportBaseModel):
@@ -22,12 +22,13 @@ class Transaction(ExportBaseModel):
     account_iban: str
     account_currency: str
     date_valid: date
-    amount: Decimal = Field(description="Signed amount; negative = money out")
+    amount: Amount
     amount_currency: str
     date_book: date | None = None
     text: str | None = None
     other_name: str | None = None
     other_iban: str | None = None
+    # TODO: The Pydantic model should hold a category object, NOT the category id which is owned by the DB
     category_id: int | None = None
 
     @computed_field  # type: ignore[prop-decorator]