refactors

backend/repositories/price.py

@@ -1,5 +1,7 @@
 """Price repository for database queries."""
 
+from datetime import datetime
+
 from sqlalchemy import desc, select
 from sqlalchemy.ext.asyncio import AsyncSession
 
@@ -25,3 +27,32 @@ class PriceRepository:
         )
         result = await self.db.execute(query)
         return result.scalar_one_or_none()
+
+    async def get_recent(self, limit: int = 20) -> list[PriceHistory]:
+        """Get the most recent price history records."""
+        query = select(PriceHistory).order_by(desc(PriceHistory.timestamp)).limit(limit)
+        result = await self.db.execute(query)
+        return list(result.scalars().all())
+
+    async def get_by_timestamp(
+        self,
+        timestamp: str | datetime,
+        source: str = SOURCE_BITFINEX,
+        pair: str = PAIR_BTC_EUR,
+    ) -> PriceHistory | None:
+        """Get a price record by timestamp."""
+        # Convert string timestamp to datetime if needed
+        timestamp_dt: datetime
+        if isinstance(timestamp, str):
+            timestamp_dt = datetime.fromisoformat(timestamp.replace("Z", "+00:00"))
+        else:
+            timestamp_dt = timestamp
+
+        result = await self.db.execute(
+            select(PriceHistory).where(
+                PriceHistory.source == source,
+                PriceHistory.pair == pair,
+                PriceHistory.timestamp == timestamp_dt,
+            )
+        )
+        return result.scalar_one_or_none()