Removed qu_factor_purchase_to_stock (migrated existing factors to normal product specific QU conversions)

changelog/70_UNRELEASED_xxxx.xx.xx.md

@@ -1,6 +1,6 @@
 > ⚠️ PHP 8.1 (with SQLite 3.34.0+) is from now on the only supported runtime version.
 
-> ❗ xxxImportant upgrade informationXXX
+> ❗ The major version bump is due to breaking API changes, please see below if you use the API.
 
 ### New feature: xxxx
 
@@ -9,6 +9,9 @@
 ### Stock
 
 - Quantity unit conversions now support transitive conversions, means the QU hierarchy has now unlimited levels (thanks a lot @esclear)
+- The product option "Factor purchase to stock quantity unit" was removed
+  - => Use normal product specific QU conversions instead, if needed
+  - An existing "Factor purchase to stock quantity unit" was automatically migrated to a product specific QU conversion
 - Fixed that hiding the "Purchased date" column (table options) on the stock entries page didn't work
 - Fixed that the consumed amount was wrong, when consuming multiple substituted subproducts at once and when multiple/different conversion factors were involved
 
@@ -56,6 +59,9 @@
 
 ### API
 
+- ⚠️ **Breaking changes**:
+  - The product property `qu_factor_purchase_to_stock` was removed (existing factors were migrated to normal product specific QU conversions, see above)
+  - The endpoint `/stock/products/{productId}` returns a new field/property `qu_conversion_factor_purchase_to_stock` for convenience (contains the conversion factor of the corresponding QU conversion from the product's qu_id_purchase to qu_id_stock)
 - The following entities are now also available via the endpoint `/objects/{entity}` (only listing, no edit)
   - `quantity_unit_conversions_resolved` (returns all final/resolved conversion factors per product and any directly or indirectly related quantity units)
 - The endpoint `/batteries` now also returns the corresponding battery object (as field/property `battery`)