Documents the fix for breakeven SL using database entry price instead of
Drift's actual on-chain entry price.
Issue: Database stored $139.18 but Drift actual was $139.07, causing
'breakeven' SL to lock in $0.11 loss per token for SHORT positions.
Solution: Query position.entryPrice from Drift SDK (calculated from
on-chain quoteAssetAmount / baseAssetAmount) when setting breakeven.
Includes real incident details, code comparison, and relationship to
Common Pitfall #33 (orphaned position restoration).
Related commit: 528a0f4
56b2195b88