- Group trades by symbol before validation
- Keep only most recent trade per symbol
- Close older duplicates with DUPLICATE_CLEANUP reason
- Prevents reopening old closed trades when checking recent trades
Bug: Startup validator was reopening ALL closed trades for a symbol
if Drift showed one position, causing 3 trades to be tracked when
only 1 actual position existed on Drift.
Impact: Position Manager was tracking ghost positions, causing
confusion and potential missed risk management.
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