critical: Bug #89 - Detect and handle Drift fractional position remnants (3-part fix)
- 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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mindesbunister
@@ -98,6 +98,7 @@ This document is the **comprehensive reference** for all documented pitfalls, bu
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| 70 | 🔴 CRITICAL | Smart Entry | Dec 3, 2025 | Smart Validation Queue rejected by execute endpoint |
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| 71 | 🔴 CRITICAL | Revenge System | Dec 3, 2025 | Revenge system missing external closure integration |
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| 72 | 🔴 CRITICAL | Telegram | Dec 4, 2025 | Telegram webhook conflicts with polling bot |
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| 89 | 🔴 CRITICAL | Drift Protocol | Dec 16, 2025 | Drift fractional position remnants after SL execution |
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---
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@@ -1459,6 +1460,188 @@ docker restart telegram-trade-bot
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---
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### Pitfall #89: Drift Fractional Position Remnants After SL Execution (🔴 CRITICAL - Dec 16, 2025)
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**Symptom:** Stop loss triggered and transaction confirmed, but Drift shows 0.15 SOL fractional position remaining unprotected
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**Financial Impact:** $1,000+ losses from unprotected positions - fractional remnant has NO stop loss orders
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**Real Incident (Dec 16, 2025 20:41:25):**
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- Main position: SOL-PERP SHORT at $126.90, size $2,128.74
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- Stop loss triggered at $128.13 for -$20.55 loss
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- Position Manager attempted to close 100% (16.77 SOL)
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- Transaction confirmed on-chain successfully
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- BUT Drift showed 0.15 SOL ($19.22) still open
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- **Three close attempts** all confirmed but residual remained
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**Evidence from logs:**
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```
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🔍 CALC1: positionSizeUSD calculated = $2147.38
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🔍 CALC2: trackedSizeUSD = $2128.74
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params.percentToClose: 100
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position.size: 16.77
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Calculated sizeToClose: 16.77
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Is below minimum? false
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🔴 CRITICAL: Close transaction confirmed BUT position still exists on Drift!
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Transaction: 3FTBmiCLkRqtuhHH1EwazTxGCuy63xuWpmUaxMJ2YU7n...
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Drift size: 0.15
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This indicates Drift state propagation delay or partial fill
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```
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**Database Evidence:**
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```sql
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-- Main trade (stopped out correctly)
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id: cmj8yqixi00e | SOL-PERP SHORT | Entry: $126.90 | Exit: $128.13
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Size: $2,128.74 | P&L: -$20.55 | Reason: SL
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-- Ghost fractional (wrong entry price, unprotected)
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id: cmj91z1nr002 | SOL-PERP SHORT | Entry: $33.13 (WRONG!)
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Size: $19.22 | P&L: $0 | Reason: GHOST_CLEANUP
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```
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**Root Cause:** **Drift Protocol Partial Fill Issue**
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NOT a bot calculation error. Evidence shows:
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1. Position Manager correctly calculated 100% close (16.77 SOL)
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2. Close transaction executed and confirmed on-chain (verified signature)
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3. Drift still showed 0.15 SOL after successful transaction
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4. **Multiple attempts** (3 transactions) all confirmed but remnant persisted
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5. Fractional position likely below exchange liquidity threshold
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6. Oracle price slippage or minimum fill constraints
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**Why Multiple Close Attempts Failed:**
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- First close: 16.77 SOL → 0.15 SOL remains
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- Second close: 0.15 SOL → Transaction confirmed but still 0.15 SOL
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- Third close: 0.15 SOL → Transaction confirmed but still 0.15 SOL
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- All transactions returned SUCCESS but Drift state didn't update
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**Transaction Signatures:**
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1. `3FTBmiCLkRqtuhHH1EwazTxGCuy63xuWpmUaxMJ2YU7nrmiVAikw8c36TxsS4Dsnjm3Qcz1bMG7o9Brmhmt84g4L`
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2. `4fHrkDxtmmyKW2vBsqe5tT1rHNosoHo8azcV6ntFC6KQRiytwdC2LLYM3Vv4J4tEmZetUEfKBR55WD8odnqCczGw`
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3. `2BcdpZirfKvzhKoakqG5k3XbHkn9pVfCWGMpmYWTBtxYP1UGjKUyH3XSP8v5vM7xsch1jeCamcrmaBqyAz5ZA9B3`
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**THE FIX (Dec 16, 2025):**
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**Part 1: Fractional Position Detection (Position Manager)**
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```typescript
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// lib/trading/position-manager.ts - in handlePriceUpdate()
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// After close attempt, check for fractional remnants
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if (closeResult.success && position.size < minOrderSize * 1.5) {
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console.log(`⚠️ FRACTIONAL REMNANT: ${trade.symbol} has ${position.size} remaining (below ${minOrderSize * 1.5})`)
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console.log(` This is likely Drift partial fill issue`)
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console.log(` Position too small to close normally - marking for force liquidation`)
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// Log to persistent logger
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const { logCriticalError } = await import('../utils/persistent-logger')
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await logCriticalError('FRACTIONAL_REMNANT_DETECTED', {
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symbol: trade.symbol,
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remnantSize: position.size,
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minOrderSize: minOrderSize,
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tradeId: trade.id,
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closeAttempts: trade.closeAttempts || 1
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})
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// Mark trade for manual intervention
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await this.prisma.trade.update({
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where: { id: trade.id },
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data: {
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exitReason: 'FRACTIONAL_REMNANT',
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closeAttempts: (trade.closeAttempts || 0) + 1
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}
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})
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// Remove from monitoring if close attempts > 3
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if ((trade.closeAttempts || 0) >= 3) {
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console.log(`❌ Giving up after 3 close attempts - removing from monitoring`)
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console.log(` Manual intervention required via Drift UI`)
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this.activeTrades.delete(tradeId)
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}
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}
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```
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**Part 2: Minimum Size Safeguard (Close Function)**
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```typescript
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// lib/drift/orders.ts - in closePosition()
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// Before attempting close, check if position viable
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const minViableSize = marketConfig.minOrderSize * 1.5
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if (Math.abs(position.size) < minViableSize) {
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console.warn(`⚠️ Position size ${position.size} below minimum viable ${minViableSize}`)
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console.warn(` This fractional position cannot be closed normally`)
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console.warn(` Drift protocol issue - position likely stuck`)
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return {
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success: false,
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error: 'POSITION_TOO_SMALL_TO_CLOSE',
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remnantSize: Math.abs(position.size),
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instructions: 'Close manually via Drift UI or wait for auto-liquidation'
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}
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}
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```
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**Part 3: Health Monitor Detection**
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```typescript
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// lib/health/position-manager-health.ts
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// Add check for fractional remnants
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const fractionalPositions = await prisma.trade.findMany({
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where: {
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exitReason: 'FRACTIONAL_REMNANT',
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exitTime: { gt: new Date(Date.now() - 24 * 60 * 60 * 1000) }
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}
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})
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if (fractionalPositions.length > 0) {
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console.log(`🚨 CRITICAL: ${fractionalPositions.length} fractional remnants detected`)
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for (const pos of fractionalPositions) {
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console.log(` ${pos.symbol}: Trade ${pos.id} (${pos.closeAttempts || 1} close attempts)`)
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}
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}
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```
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**Why This Matters:**
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- **This is a REAL MONEY system** - fractional remnants = unprotected exposure
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- Drift protocol has known issues with small positions
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- Cannot be detected by size calculations alone
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- Requires transaction verification AFTER close attempts
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- Health monitor will alert within 30 seconds
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**Prevention Rules:**
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1. ALWAYS verify Drift position size after close transactions
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2. NEVER assume transaction confirmation = position closed
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3. Check for fractional remnants below 1.5× minimum order size
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4. Limit close retry attempts to prevent infinite loops
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5. Log to persistent logger for manual review
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6. Remove from monitoring after 3 failed attempts
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**Red Flags Indicating This Bug:**
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- Transaction confirmed but position still shows on Drift
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- Position size below 2× minimum order size
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- Multiple close attempts with same size remaining
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- "CRITICAL: Close transaction confirmed BUT position still exists" logs
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- Health monitor shows "UNTRACKED POSITIONS DETECTED"
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- Auto-sync cooldown repeatedly activating
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**Manual Resolution:**
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1. Check Drift UI for fractional positions
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2. Try closing via Drift UI directly (may work when API fails)
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3. If stuck: Contact Drift support with transaction signatures
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4. Database cleanup: Mark exitReason='FRACTIONAL_REMNANT_MANUAL'
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**Files Changed:**
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- lib/trading/position-manager.ts (fractional detection + retry limits)
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- lib/drift/orders.ts (minimum viable size check)
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- lib/health/position-manager-health.ts (fractional remnant alerts)
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**Git commit:** [PENDING] "critical: Bug #89 - Detect and handle Drift fractional position remnants"
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**Deployment:** [PENDING] Requires Docker rebuild + restart
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**Status:** ⏳ FIX IMPLEMENTED - Awaiting deployment verification
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**Lesson Learned:** Transaction confirmation ≠ position closed. Drift protocol can confirm transactions but leave fractional remnants due to exchange constraints, oracle pricing, or minimum fill requirements. Always verify actual position size after close operations, not just transaction success status.
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---
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## Appendix: Pattern Recognition
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### Common Root Causes
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