Access permissions, seed permissions, security, session, api/session improved handling + speed across the site/UX improvements

backend/app/services/mix_calculator_service.py

@@ -2,8 +2,8 @@ from __future__ import annotations
 
 from datetime import date
 
-from sqlalchemy import select
-from sqlalchemy.orm import Session, selectinload
+from sqlalchemy import func, select
+from sqlalchemy.orm import Session, joinedload, selectinload
 
 from app.api.deps import AuthSession
 from app.models.mix import Mix, MixIngredient
@@ -108,29 +108,39 @@ def calculate_mix_calculator_preview(
 
 
 def build_mix_calculator_options(db: Session, *, tenant_id: str) -> dict:
+    # Aggregate mix totals in a single query instead of loading every
+    # ingredient row for every product. The previous implementation was the
+    # main slow path on first Mix Calculator open — it streamed the entire
+    # tenant's recipe table just to compute one sum per product.
+    mix_totals_rows = db.execute(
+        select(MixIngredient.mix_id, func.coalesce(func.sum(MixIngredient.quantity_kg), 0.0))
+        .join(Mix, Mix.id == MixIngredient.mix_id)
+        .where(Mix.tenant_id == tenant_id)
+        .group_by(MixIngredient.mix_id)
+    ).all()
+    mix_totals: dict[int, float] = {mix_id: round(total or 0.0, 4) for mix_id, total in mix_totals_rows}
+
     products = db.scalars(
         select(Product)
         .where(Product.tenant_id == tenant_id)
-        .options(selectinload(Product.mix).selectinload(Mix.ingredients))
+        .options(joinedload(Product.mix))
         .order_by(Product.client_name, Product.name)
     ).all()
 
-    product_rows = []
     clients = sorted({product.client_name for product in products})
-    for product in products:
-        mix_total_kg = round(sum(ingredient.quantity_kg for ingredient in (product.mix.ingredients if product.mix else [])), 4)
-        product_rows.append(
-            {
-                "product_id": product.id,
-                "client_name": product.client_name,
-                "product_name": product.name,
-                "mix_id": product.mix_id,
-                "mix_name": product.mix.name if product.mix else "",
-                "unit_of_measure": product.unit_of_measure,
-                "unit_size_kg": round(extract_unit_quantity_kg(product.unit_of_measure), 4),
-                "mix_total_kg": mix_total_kg,
-            }
-        )
+    product_rows = [
+        {
+            "product_id": product.id,
+            "client_name": product.client_name,
+            "product_name": product.name,
+            "mix_id": product.mix_id,
+            "mix_name": product.mix.name if product.mix else "",
+            "unit_of_measure": product.unit_of_measure,
+            "unit_size_kg": round(extract_unit_quantity_kg(product.unit_of_measure), 4),
+            "mix_total_kg": mix_totals.get(product.mix_id, 0.0),
+        }
+        for product in products
+    ]
 
     return {"clients": clients, "products": product_rows}