[Python] Python validation function rejects "yahoo_finance" data source - how to fix?

My Python trading system validation function rejects signals with error "Invalid data source: yahoo_finance".

The scanner generates signals with data_source: "yahoo_finance" but the validation function only checks the source field and doesn't recognize "yahoo_finance" as a valid source.

Here's the validation code that's failing:

def _validate_signal_quality(self, signal):
source = signal.get('source', 'unknown')
real_sources = ['yahoo', 'enhanced', 'yfinance', 'market_data', 'real_time']
if source not in real_sources:
print(f" ❌ Invalid data source: {source}")
return False
return True

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