# MEV Bot Critical Fixes - Deployment Checklist
**Date**: October 25, 2025
**Commit**: `14bf75c` on `feature/production-profit-optimization`
**Status**: ✅ **READY FOR DEPLOYMENT**

---

## ✅ Pre-Deployment Verification

- [x] **Log audit completed** - Identified 3 critical issues
- [x] **Root cause analysis** - All issues documented
- [x] **Fixes implemented** - All 3 fixes applied
- [x] **Build validation** - `make build` ✅ SUCCESS
- [x] **Package tests** - Modified packages pass tests
- [x] **Code committed** - Commit `14bf75c` created
- [x] **Documentation** - Complete implementation & investigation reports

---

## 📦 What Was Fixed

### Fix #1: Zero Address Token Bug ⚠️ CRITICAL
**Impact**: 100% of opportunities were failing
**Solution**: Populate token addresses from pool contract data
**Expected Result**: Token addresses will be valid, profit calculations accurate

### Fix #2: RPC Rate Limiting 🔄 HIGH
**Impact**: 61 rate limit errors per scan
**Solution**: Exponential backoff + reduced rate limit (10→5 RPS)
**Expected Result**: <5 rate limit errors per scan

### Fix #3: Pool Blacklist 🚫 MEDIUM
**Impact**: 12+ failed RPC calls to invalid pool
**Solution**: Automatic blacklisting system
**Expected Result**: Zero calls to blacklisted pools

---

## 🚀 Deployment Steps

### 1. Stop Current MEV Bot
```bash
# If running in background
pkill -f mev-bot

# Or if you know the process ID
kill <PID>
```

### 2. Archive Current Logs
```bash
./scripts/log-manager.sh archive
# OR
./scripts/archive-logs.sh
```

### 3. Build New Binary
```bash
make build
```

### 4. Verify Build
```bash
./bin/mev-bot --version
# OR
./mev-bot --version
```

### 5. Deploy & Start
```bash
# Option 1: Using run script
./scripts/run.sh

# Option 2: Direct execution
PROVIDER_CONFIG_PATH=$PWD/config/providers_runtime.yaml timeout 120 ./mev-bot start

# Option 3: With logging
PROVIDER_CONFIG_PATH=$PWD/config/providers_runtime.yaml LOG_LEVEL=info ./mev-bot start 2>&1 | tee logs/deployment_$(date +%Y%m%d_%H%M%S).log
```

---

## 🔍 Post-Deployment Monitoring (First 30 Minutes)

### Critical Checks

**1. Token Addresses Are Valid**
```bash
# Check swap events log
tail -f logs/swap_events_*.jsonl | jq '.token0Address, .token1Address'

# Should see actual addresses like:
# "0x82aF49447D8a07e3bd95BD0d56f35241523fBab1"  ← WETH
# "0xaf88d065e77c8cC2239327C5EDb3A432268e5831"  ← USDC

# NOT zero addresses like:
# "0x0000000000000000000000000000000000000000"  ← BAD
```

**2. Rate Limit Retries Working**
```bash
# Watch for rate limit handling
tail -f logs/mev_bot.log | grep -i "rate limit\|RPS limit"

# Should see messages like:
# "⚠️ RPC rate limit hit (attempt 1/3), applying exponential backoff"
# "📊 Rate limiting configured: 5.0 requests/second"
```

**3. Blacklisted Pool Skipped**
```bash
# Verify blacklist is active
tail -f logs/mev_bot.log | grep -i "blacklist"

# Should see on startup:
# "🚫 Blacklisted pool 0xB1026b8e7276e7AC75410F1fcbbe21796e8f7526: slot0() consistently reverts"

# And during operation:
# "Skipping blacklisted pool 0xB102...7526"
```

**4. Opportunities Being Detected**
```bash
# Monitor opportunity detection
tail -f logs/mev_bot_opportunities.log | jq '.token0, .token1, .estimatedProfitUSD'

# Look for non-zero profit estimates
```

---

## 📊 Success Metrics

### Within 10 Minutes
- [ ] Token addresses are NOT `0x0000...0000`
- [ ] Pool blacklist message appears in logs
- [ ] Rate limiting configured at 5 RPS

### Within 30 Minutes
- [ ] At least 1 opportunity with valid token addresses
- [ ] Rate limit errors < 5 (down from 61)
- [ ] No RPC calls to `0xB102...7526`
- [ ] Swap events have correct token symbols

### Within 1 Hour
- [ ] Multiple opportunities detected
- [ ] Token addresses matching actual pools
- [ ] Price impacts are realistic (not 10^60)
- [ ] Some opportunities marked as executable

---

## 🚨 Rollback Procedure

**If any critical issue occurs:**

### Quick Rollback
```bash
# Stop the bot
pkill -f mev-bot

# Revert to previous commit
git reset --hard fcf141c

# Rebuild
make build

# Restart
./scripts/run.sh
```

### Verify Rollback
```bash
git log --oneline -1
# Should show: fcf141c fix(uniswap): correct slot0() ABI unpacking
```

---

## 🎯 Rollback Triggers

Rollback immediately if you observe:
- ❌ **More errors** than before deployment
- ❌ **New panic/crash** not present in previous version
- ❌ **Zero opportunities** for 30+ minutes (regression)
- ❌ **Increased rate limit errors** (>100 in 30 min)

---

## 📈 Expected Improvements

| Metric | Before | After (Expected) |
|--------|--------|------------------|
| Valid Token Addresses | 0% | 100% |
| Executable Opportunities | 0 | 1-3 per 1000 swaps |
| RPC Rate Limit Errors | 61/scan | <5/scan |
| Invalid Pool RPC Calls | 12/scan | 0/scan |
| Arbitrage Success Rate | 0% | 20-40% |

---

## 📁 Important Files

**Investigation & Documentation**:
- `LOG_AUDIT_FINDINGS.md` - Detailed problem analysis
- `FIXES_IMPLEMENTED.md` - Complete implementation details
- `DEPLOYMENT_CHECKLIST.md` - This file

**Modified Code**:
- `pkg/scanner/swap/analyzer.go` - Token address fix
- `pkg/arbitrum/connection.go` - Rate limiting fix
- `pkg/scanner/market/scanner.go` - Pool blacklist

**Logs to Monitor**:
- `logs/mev_bot.log` - Main application log
- `logs/mev_bot_errors.log` - Error tracking
- `logs/mev_bot_opportunities.log` - Opportunity detection
- `logs/swap_events_*.jsonl` - Swap event data

---

## 💡 Tips

1. **Use tmux or screen** for long-running sessions
2. **Archive logs before deployment** to compare before/after
3. **Monitor for first hour** to catch any issues early
4. **Check opportunity logs** for realistic profit estimates
5. **Note token symbols** - should see WETH, USDC, USDT, not TOKEN_0x000000

---

## 🆘 Emergency Contacts

**If Critical Issues Arise:**
1. Check `logs/mev_bot_errors.log` for error patterns
2. Review git diff: `git diff fcf141c 14bf75c`
3. Use log manager: `./scripts/log-manager.sh analyze`
4. Archive and investigate: `./scripts/log-manager.sh health`

---

## ✅ Final Checklist Before Deployment

- [ ] Current bot is stopped
- [ ] Logs are archived
- [ ] New binary is built
- [ ] Config files are in place
- [ ] Ready to monitor for 30+ minutes
- [ ] Have rollback plan ready
- [ ] Know how to check success metrics

---

**Ready to deploy? Run:**
```bash
./scripts/run.sh
```

**Then monitor with:**
```bash
tail -f logs/mev_bot.log | grep -i "token0\|token1\|blacklist\|rate limit"
```

---

**Deployment Date**: _____________
**Deployed By**: _____________
**Status**: ⬜ Success  ⬜ Rollback Required
**Notes**: ___________________________________________________