Adding ability to update / patch by sku, adding uniqueness constraint violation checks

app/api/part_colours.py

@@ -27,6 +27,8 @@ async def create_part_colour(
     db: AsyncSession = Depends(get_db),
     actor: User = Depends(require_permission("part_colours:write")),
 ):
+    if await part_colour_crud.get_by_name(db, payload.name):
+        raise HTTPException(status_code=409, detail="Part colour already exists")
     pc = await part_colour_crud.create(db, name=payload.name)
     await audit_crud.log(
         db,
@@ -62,6 +64,10 @@ async def update_part_colour(
     if pc is None:
         raise HTTPException(status_code=404, detail="Part colour not found")
     changes = payload.model_dump(exclude_unset=True)
+    if "name" in changes:
+        existing = await part_colour_crud.get_by_name(db, changes["name"])
+        if existing is not None and existing.id != pc.id:
+            raise HTTPException(status_code=409, detail="Part colour already exists")
     pc = await part_colour_crud.update(db, pc, changes)
     await audit_crud.log(
         db,