refactors

backend/repositories/__init__.py

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+"""Repository layer for database queries."""
+
+from repositories.price import PriceRepository
+from repositories.user import UserRepository
+
+__all__ = ["PriceRepository", "UserRepository"]

backend/repositories/price.py

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+"""Price repository for database queries."""
+
+from sqlalchemy import desc, select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from models import PriceHistory
+from price_fetcher import PAIR_BTC_EUR, SOURCE_BITFINEX
+
+
+class PriceRepository:
+    """Repository for price-related database queries."""
+
+    def __init__(self, db: AsyncSession):
+        self.db = db
+
+    async def get_latest(
+        self, source: str = SOURCE_BITFINEX, pair: str = PAIR_BTC_EUR
+    ) -> PriceHistory | None:
+        """Get the most recent price from the database."""
+        query = (
+            select(PriceHistory)
+            .where(PriceHistory.source == source, PriceHistory.pair == pair)
+            .order_by(desc(PriceHistory.timestamp))
+            .limit(1)
+        )
+        result = await self.db.execute(query)
+        return result.scalar_one_or_none()

backend/repositories/user.py

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+"""User repository for database queries."""
+
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from models import User
+
+
+class UserRepository:
+    """Repository for user-related database queries."""
+
+    def __init__(self, db: AsyncSession):
+        self.db = db
+
+    async def get_by_email(self, email: str) -> User | None:
+        """Get a user by email."""
+        result = await self.db.execute(select(User).where(User.email == email))
+        return result.scalar_one_or_none()
+
+    async def get_by_id(self, user_id: int) -> User | None:
+        """Get a user by ID."""
+        result = await self.db.execute(select(User).where(User.id == user_id))
+        return result.scalar_one_or_none()