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src/dutylog/infrastructure/database/dao/users_dao.py

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+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from src.dutylog.infrastructure.database.models.user import User
+
+
+class UsersDAO:
+    def __init__(self, session: AsyncSession):
+        self.session = session
+
+    async def get_user(self, user_id: int) -> User | None:
+        result = await self.session.execute(
+            select(User).where(User.id == user_id)
+        )
+        return result.scalar_one_or_none()
+
+    async def create_user(self, user_id: int, username: str | None) -> User:
+        user = User(id=user_id, username=username)
+        self.session.add(user)
+        await self.session.commit()
+        return user