diff --git a/fooder/db.py b/fooder/db.py
index 87ce60b..767387f 100644
--- a/fooder/db.py
+++ b/fooder/db.py
@@ -4,6 +4,7 @@ from typing import AsyncIterator, AsyncGenerator
 from fooder.settings import Settings, settings
 from sqlalchemy.ext.asyncio import (
     AsyncConnection,
+    AsyncEngine,
     AsyncSession,
     async_sessionmaker,
     create_async_engine,
@@ -12,7 +13,7 @@ from sqlalchemy.ext.asyncio import (
 
 class DatabaseSessionManager:
     def __init__(self, settings: Settings) -> None:
-        self._engine = create_async_engine(
+        self._engine: AsyncEngine | None = create_async_engine(
             settings.DB_URI,
             pool_pre_ping=True,
             echo=settings.ECHO_SQL,
@@ -22,7 +23,7 @@ class DatabaseSessionManager:
                 else {}
             ),
         )
-        self._sessionmaker = async_sessionmaker(
+        self._sessionmaker: async_sessionmaker[AsyncSession] | None = async_sessionmaker(
             autocommit=False,
             autoflush=False,
             bind=self._engine,
diff --git a/fooder/model/base.py b/fooder/model/base.py
index a0d3554..4ec948f 100644
--- a/fooder/model/base.py
+++ b/fooder/model/base.py
@@ -1,4 +1,11 @@
-from pydantic import ConfigDict
+from typing import Annotated
+
+from pydantic import ConfigDict, Field
+
+Macronutrient = Annotated[float, Field(ge=0, le=100)]
+OptionalMacronutrient = Annotated[float | None, Field(default=None, ge=0, le=100)]
+Calories = Annotated[float, Field(ge=0)]
+OptionalCalories = Annotated[float | None, Field(default=None, ge=0)]
 
 
 class ObjModelMixin:
diff --git a/fooder/model/product.py b/fooder/model/product.py
index dfc0a29..337b7a0 100644
--- a/fooder/model/product.py
+++ b/fooder/model/product.py
@@ -1,24 +1,25 @@
-from .base import ObjModelMixin
-from pydantic import BaseModel, Field
+from .base import ObjModelMixin, Macronutrient, OptionalMacronutrient, Calories, OptionalCalories
+from pydantic import BaseModel
 from fooder.utils.calories import calculate_calories
 
 
-class ProductModelBase(BaseModel):
+class ProductModel(ObjModelMixin, BaseModel):
     name: str
-    protein: float = Field(ge=0, le=100)
-    carb: float = Field(ge=0, le=100)
-    fat: float = Field(ge=0, le=100)
-    fiber: float = Field(ge=0, le=100)
-    calories: float = Field(ge=0)
-    barcode: str | None
+    protein: Macronutrient
+    carb: Macronutrient
+    fat: Macronutrient
+    fiber: Macronutrient
+    calories: Calories
+    barcode: str | None = None
 
 
-class ProductModel(ObjModelMixin, ProductModelBase):
-    pass
-
-
-class ProductCreateModel(ProductModelBase):
-    calories: float | None = None
+class ProductCreateModel(BaseModel):
+    name: str
+    protein: Macronutrient
+    carb: Macronutrient
+    fat: Macronutrient
+    fiber: Macronutrient
+    calories: OptionalCalories = None
     barcode: str | None = None
 
     @property
@@ -35,11 +36,11 @@ class ProductCreateModel(ProductModelBase):
         )
 
 
-class ProductUpdateModel(ProductModelBase):
+class ProductUpdateModel(BaseModel):
     name: str | None = None
-    protein: float | None = None
-    carb: float | None = None
-    fat: float | None = None
-    fiber: float | None = None
-    calories: float | None = None
+    protein: OptionalMacronutrient = None
+    carb: OptionalMacronutrient = None
+    fat: OptionalMacronutrient = None
+    fiber: OptionalMacronutrient = None
+    calories: OptionalCalories = None
     barcode: str | None = None
diff --git a/fooder/repository/base.py b/fooder/repository/base.py
index dc40b6b..f5d6b64 100644
--- a/fooder/repository/base.py
+++ b/fooder/repository/base.py
@@ -1,6 +1,6 @@
 from typing import TypeVar, Generic, Type, Sequence
 from sqlalchemy.ext.asyncio import AsyncSession
-from sqlalchemy import select, delete as sa_delete, update as sa_update, ColumnElement
+from sqlalchemy import Delete, Update, select, delete as sa_delete, update as sa_update, ColumnElement
 from sqlalchemy.exc import IntegrityError
 from sqlalchemy.orm.exc import StaleDataError
 from sqlalchemy.sql import Select
@@ -86,12 +86,12 @@ class RepositoryBase(Generic[T]):
         return obj
 
     async def _delete(self, *expressions: ColumnElement):
+        stmt: Update | Delete
         if hasattr(self.model, "deleted_at"):
-            stmt = sa_update(self.model).values(deleted_at=utc_now())  # type: ignore[attr-defined]
+            stmt = sa_update(self.model).values(deleted_at=utc_now())
         else:
             stmt = sa_delete(self.model)
 
         if expressions:
             stmt = stmt.where(*expressions)
-
         await self.session.execute(stmt)
diff --git a/fooder/repository/user_product_usage.py b/fooder/repository/user_product_usage.py
index 19bf84c..0d4b284 100644
--- a/fooder/repository/user_product_usage.py
+++ b/fooder/repository/user_product_usage.py
@@ -1,4 +1,7 @@
+from typing import cast
+
 from sqlalchemy import update as sa_update
+from sqlalchemy.engine import CursorResult
 
 from fooder.domain.user_product_usage import UserProductUsage
 from fooder.repository.base import RepositoryBase
@@ -14,7 +17,7 @@ class UserProductUsageRepository(RepositoryBase[UserProductUsage]):
             )
             .values(count=UserProductUsage.count + count)
         )
-        result = await self.session.execute(stmt)
+        result = cast(CursorResult, await self.session.execute(stmt))
 
         if result.rowcount == 0:
             obj = UserProductUsage(user_id=user_id, product_id=product_id, count=count)
diff --git a/mypy.ini b/mypy.ini
index 8e19889..5d2114e 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -2,7 +2,7 @@
 [mypy]
 plugins = sqlalchemy.ext.mypy.plugin,pydantic.mypy
 
-exclude = .*/test/.*
+exclude = .*/test/.*|fooder/alembic/.*
 
 pretty = True