- Added getActualFillPriceFromTx() helper using Drift SDK LogParser
- Extracts OrderActionRecord from transaction logs for real fill data
- P&L now calculated from exitPrice (actual fill) not oraclePrice
- Fixes ~5.7% P&L over-reporting issue ($7.53 on $133 trade)
Root cause: Oracle price at close time differs from actual fill price
Evidence: Drift showed $133.03, database showed $140.56
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