- Part 1: Position Manager fractional remnant detection after close attempts
* Check if position < 1.5× minOrderSize after close transaction
* Log to persistent logger with FRACTIONAL_REMNANT_DETECTED
* Track closeAttempts, limit to 3 maximum
* Mark exitReason='FRACTIONAL_REMNANT' in database
* Remove from monitoring after 3 failed attempts
- Part 2: Pre-close validation in closePosition()
* Check if position viable before attempting close
* Reject positions < 1.5× minOrderSize with specific error
* Prevent wasted transaction attempts on too-small positions
* Return POSITION_TOO_SMALL_TO_CLOSE error with manual instructions
- Part 3: Health monitor detection for fractional remnants
* Query Trade table for FRACTIONAL_REMNANT exits in last 24h
* Alert operators with position details and manual cleanup instructions
* Provide trade IDs, symbols, and Drift UI link
- Database schema: Added closeAttempts Int? field to Track attempts
Root cause: Drift protocol exchange constraints can leave fractional positions
Evidence: 3 close transactions confirmed but 0.15 SOL remnant persisted
Financial impact: ,000+ risk from unprotected fractional positions
Status: Fix implemented, awaiting deployment verification
See: docs/COMMON_PITFALLS.md Bug #89 for complete incident details
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