feat: modules, products, services, services kits

models/mixins.py

@@ -1,6 +1,6 @@
 from datetime import datetime, timezone
 
-from sqlalchemy import DateTime
+from sqlalchemy import DateTime, Numeric
 from sqlalchemy.orm import Mapped, mapped_column
 
 
@@ -21,3 +21,11 @@ class CreatedAtMixin:
         default=lambda: datetime.now(timezone.utc),
         nullable=False,
     )
+
+
+class PriceMixin:
+    price: Mapped[float] = mapped_column(Numeric(12, 2), comment="Стоимость")
+
+
+class CostMixin:
+    cost: Mapped[float] = mapped_column(Numeric(12, 2), comment="Себестоимость")