docs: Document BlockedSignal data contamination from old v9 alerts

- Discovery: All TradingView alerts (5min/15min/1H/4H/Daily) attached to OLD v9 version
- Impact: 11,429 records from wrong indicator settings (confirmBars=0 vs current)
- Solution: Marked as DATA_COLLECTION_OLD_V9_VERSION to prevent analysis contamination
- Exception: 1-minute data (11,398) kept as DATA_COLLECTION_ONLY (unaffected)
- Fresh data from corrected alerts will use DATA_COLLECTION_ONLY going forward
- Old data preserved for historical reference, clearly marked
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mindesbunister
2025-12-05 10:37:01 +01:00
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