Introduce product details table

src/allmende_payment_system/api/admin.py

@@ -1,7 +1,8 @@
+import datetime
 from typing import Annotated
 
 from fastapi import APIRouter, File, Form, HTTPException, Request
-from sqlalchemy import select
+from sqlalchemy import func, select
 from sqlalchemy.exc import IntegrityError
 from starlette import status
 from starlette.responses import RedirectResponse
@@ -13,6 +14,7 @@ from allmende_payment_system.models import (
     Area,
     Permission,
     Product,
+    ProductDetails,
     Transaction,
     User,
     UserGroup,
@@ -234,9 +236,14 @@ async def edit_product_post(
         select(Product).where(Product.id == product_id)
     ).scalar_one()
 
-    for field_name, data in product_data.model_dump().items():
-        setattr(product, field_name, data)
+    new_details = ProductDetails(
+        valid_from=func.now(),
+    )
 
+    for field_name, data in product_data.model_dump().items():
+        setattr(new_details, field_name, data)
+
+    product.details_history.append(new_details)
     session.flush()
 
     return RedirectResponse(
@@ -273,12 +280,15 @@ async def new_product_post(
     if not user.has_permission("product", "edit"):
         raise HTTPException(status_code=403, detail="Insufficient permissions")
 
-    product = Product()
+    product = Product(area_id=product_data.area_id)
+    session.add(product)
+    session.flush()
+
+    product_details = ProductDetails()
+    product.details_history.append(product_details)
 
     for field_name, data in product_data.model_dump().items():
-        setattr(product, field_name, data)
-
-    session.add(product)
+        setattr(product_details, field_name, data)
 
     return RedirectResponse(
         url="/admin/products", status_code=status.HTTP_303_SEE_OTHER