indicators and plots

backend/tests/test_ccxt_datasource.py

@@ -2,8 +2,10 @@
 Test script for CCXT DataSource adapter (Free Version).
 
 This demonstrates how to use the free CCXT adapter (not ccxt.pro) with various
-exchanges. It uses polling instead of WebSocket for real-time updates and
-verifies that Decimal precision is maintained throughout.
+exchanges. It uses polling instead of WebSocket for real-time updates.
+
+CCXT is configured to use Decimal mode internally for precision, but OHLCV data
+is converted to float for optimal DataFrame/analysis performance.
 """
 
 import asyncio
@@ -73,10 +75,10 @@ async def test_binance_datasource():
             print(f"     Close: {latest.data['close']} (type: {type(latest.data['close']).__name__})")
             print(f"     Volume: {latest.data['volume']} (type: {type(latest.data['volume']).__name__})")
 
-            # Verify Decimal precision
-            assert isinstance(latest.data['close'], Decimal), "Price should be Decimal type!"
-            assert isinstance(latest.data['volume'], Decimal), "Volume should be Decimal type!"
-            print(f"   ✓ Numerical precision verified: using Decimal types")
+            # Verify OHLCV uses float (converted from Decimal for DataFrame performance)
+            assert isinstance(latest.data['close'], float), "OHLCV price should be float type!"
+            assert isinstance(latest.data['volume'], float), "OHLCV volume should be float type!"
+            print(f"   ✓ OHLCV data type verified: using native float (CCXT uses Decimal internally)")
 
         # Test 5: Polling subscription (brief test)
         print("\n5. Testing polling-based subscription...")
@@ -87,7 +89,7 @@ async def test_binance_datasource():
             tick_count[0] += 1
             if tick_count[0] == 1:
                 print(f"   Received tick: close={data['close']} (type: {type(data['close']).__name__})")
-                assert isinstance(data['close'], Decimal), "Polled data should use Decimal!"
+                assert isinstance(data['close'], float), "Polled OHLCV data should use float!"
 
         subscription_id = await binance.subscribe_bars(
             symbol="BTC/USDT",