- Create PriceService with get_recent_prices() and fetch_and_store_price()
- Update routes/audit.py to use PriceService instead of direct queries
- Use PriceHistoryMapper consistently
- Update test to patch services.price.fetch_btc_eur_price
The POST /api/audit/price-history/fetch endpoint now requires
FETCH_PRICE permission instead of VIEW_AUDIT, which is more
semantically correct since it's a write operation.
- create_mock_httpx_client() for mocking AsyncClient with various configs
- create_bitfinex_ticker_response() for creating ticker response arrays
Reduces test boilerplate significantly.
When a duplicate timestamp occurs (rare but possible), return the
existing record instead of failing with a 500 error. This matches
the worker's ON CONFLICT DO NOTHING behavior.
Added test for duplicate timestamp handling.
