feat: add price history GET and POST endpoints

backend/routes/audit.py

@@ -10,16 +10,25 @@ from sqlalchemy.ext.asyncio import AsyncSession
 
 from auth import require_permission
 from database import get_db
-from models import CounterRecord, Permission, RandomNumberOutcome, SumRecord, User
+from models import (
+    CounterRecord,
+    Permission,
+    PriceHistory,
+    RandomNumberOutcome,
+    SumRecord,
+    User,
+)
 from pagination import (
     calculate_offset,
     calculate_total_pages,
     create_paginated_response,
 )
+from price_fetcher import fetch_btc_eur_price
 from schemas import (
     CounterRecordResponse,
     PaginatedCounterRecords,
     PaginatedSumRecords,
+    PriceHistoryResponse,
     RandomNumberOutcomeResponse,
     SumRecordResponse,
 )
@@ -140,3 +149,65 @@ async def get_random_job_outcomes(
         )
         for outcome, email in rows
     ]
+
+
+# =============================================================================
+# Price History Endpoints
+# =============================================================================
+
+PRICE_HISTORY_LIMIT = 20
+
+
+@router.get("/price-history", response_model=list[PriceHistoryResponse])
+async def get_price_history(
+    db: AsyncSession = Depends(get_db),
+    _current_user: User = Depends(require_permission(Permission.VIEW_AUDIT)),
+) -> list[PriceHistoryResponse]:
+    """Get the 20 most recent price history records."""
+    query = (
+        select(PriceHistory)
+        .order_by(desc(PriceHistory.timestamp))
+        .limit(PRICE_HISTORY_LIMIT)
+    )
+    result = await db.execute(query)
+    records = result.scalars().all()
+
+    return [
+        PriceHistoryResponse(
+            id=record.id,
+            source=record.source,
+            pair=record.pair,
+            price=record.price,
+            timestamp=record.timestamp,
+            created_at=record.created_at,
+        )
+        for record in records
+    ]
+
+
+@router.post("/price-history/fetch", response_model=PriceHistoryResponse)
+async def fetch_price_now(
+    db: AsyncSession = Depends(get_db),
+    _current_user: User = Depends(require_permission(Permission.VIEW_AUDIT)),
+) -> PriceHistoryResponse:
+    """Manually trigger a price fetch from Bitfinex."""
+    price, timestamp = await fetch_btc_eur_price()
+
+    record = PriceHistory(
+        source="bitfinex",
+        pair="BTC/EUR",
+        price=price,
+        timestamp=timestamp,
+    )
+    db.add(record)
+    await db.commit()
+    await db.refresh(record)
+
+    return PriceHistoryResponse(
+        id=record.id,
+        source=record.source,
+        pair=record.pair,
+        price=record.price,
+        timestamp=record.timestamp,
+        created_at=record.created_at,
+    )