telegram-bot-workers/MIGRATION_SUMMARY.md

Database Migration Summary

Migration 001: Schema Enhancements Status: ✅ Ready for Production Date: 2026-01-19

Executive Summary

Database migration to add critical data integrity constraints and audit logging capabilities. Migration has been successfully tested locally with zero data loss.

Changes at a Glance

Component	Change	Impact
user_deposits.balance	Add CHECK (balance >= 0)	Prevents negative balances
deposit_transactions.depositor_name	Add CHECK (length <= 50)	Enforces name length limit
audit_logs	New table	Tracks all critical operations

Risk Assessment

• Risk Level: Low
• Downtime: < 1 minute (transparent to users)
• Reversibility: Yes (rollback script provided)
• Data Loss Risk: None (tested locally)

---

Files Created

telegram-bot-workers/
├── migrations/
│   ├── 001_schema_enhancements.sql    # Migration script (5.5K)
│   ├── 001_rollback.sql               # Rollback script (4.0K)
│   ├── AUDIT_LOG_EXAMPLES.ts          # TypeScript examples (11K)
│   ├── TEST_RESULTS.md                # Test verification (8.0K)
│   └── README.md                      # Migration directory guide (2.8K)
├── SCHEMA_MIGRATION_GUIDE.md          # Complete deployment guide (13K)
└── MIGRATION_SUMMARY.md               # This file

Total Size: ~44K of documentation and scripts

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Pre-Deployment Checklist

⚠️ Complete before production deployment:

• Read SCHEMA_MIGRATION_GUIDE.md completely
• Backup production database
• Check for negative balances in production
• Check for long depositor names (> 50 chars) in production
• Verify rollback script is accessible
• Schedule deployment window (< 5 min)
• Notify stakeholders (optional)

---

Quick Deployment Guide

Step 1: Backup

wrangler d1 execute telegram-conversations \
  --command ".dump" > backup_$(date +%Y%m%d_%H%M%S).sql

Step 2: Deploy

wrangler d1 execute telegram-conversations \
  --file migrations/001_schema_enhancements.sql

Step 3: Verify

# Test constraint (should fail)
wrangler d1 execute telegram-conversations \
  --command "INSERT INTO user_deposits (user_id, balance) VALUES (999999, -1000)"

# Check audit_logs table
wrangler d1 execute telegram-conversations \
  --command "SELECT COUNT(*) FROM audit_logs"

Step 4: Monitor

wrangler tail --format pretty

If issues occur: Run migrations/001_rollback.sql

---

Test Results Summary

Local Testing: ✅ All tests passed

Test Category	Tests	Result
Migration Execution	3	✅ PASS
Constraint Verification	3	✅ PASS
Rollback Tests	3	✅ PASS
Data Integrity	2	✅ PASS
Performance	1	✅ PASS

Key Findings:

• Migration completes in < 1 second
• All CHECK constraints work correctly
• No data loss during migration or rollback
• Safe handling of edge cases

Full test report: migrations/TEST_RESULTS.md

---

Feature: Audit Logs

What is Tracked

• Deposit confirmations
• Domain registrations
• Balance changes
• Failed operations
• Admin actions

Usage Example

import { createAuditLog } from './audit-log-helpers';

// Log deposit confirmation
await createAuditLog(env, {
  userId,
  telegramId,
  action: 'deposit_confirmed',
  resourceType: 'deposit_transaction',
  resourceId: transactionId,
  details: {
    amount: 5000,
    depositor_name: '홍길동'
  }
});

Query Examples

-- Get user's recent activity
SELECT action, details, created_at
FROM audit_logs
WHERE telegram_id = '123456'
ORDER BY created_at DESC
LIMIT 10;

-- Get today's deposits
SELECT COUNT(*) as total_deposits, SUM(json_extract(details, '$.amount')) as total_amount
FROM audit_logs
WHERE action = 'deposit_confirmed'
  AND date(created_at) = date('now');

-- Find suspicious activity
SELECT telegram_id, action, COUNT(*) as attempts
FROM audit_logs
WHERE action LIKE '%_failed'
  AND created_at > datetime('now', '-1 hour')
GROUP BY telegram_id, action
HAVING attempts > 5;

Full examples: migrations/AUDIT_LOG_EXAMPLES.ts

---

Benefits

Immediate Benefits

1. Data Integrity: No more negative balances
2. Consistency: Enforced depositor name length
3. Auditability: Full operation tracking
4. Debugging: Complete activity history

Long-term Benefits

1. Compliance: Audit trail for financial operations
2. Security: Suspicious activity detection
3. Analytics: User behavior insights
4. Support: Complete transaction history for troubleshooting

---

Constraints Explained

Balance >= 0 (user_deposits)

Why: Prevent negative balances from bugs or invalid operations

Implementation:

balance INTEGER NOT NULL DEFAULT 0 CHECK (balance >= 0)

Effect: Any attempt to create negative balance will fail with error:

CHECK constraint failed: balance >= 0

Depositor Name Length <= 50 (deposit_transactions)

Why: Bank SMS truncates names at 7 chars, but we allow 50 for edge cases

Implementation:

depositor_name TEXT CHECK (length(depositor_name) <= 50)

Effect: Names longer than 50 chars will be rejected:

CHECK constraint failed: length(depositor_name) <= 50

---

Rollback Procedure

If migration fails or causes issues:

# Execute rollback
wrangler d1 execute telegram-conversations \
  --file migrations/001_rollback.sql

# Verify rollback
wrangler d1 execute telegram-conversations \
  --command "SELECT COUNT(*) FROM sqlite_master WHERE name='audit_logs'"
# Expected: 0 (audit_logs removed)

# Test constraint removed
wrangler d1 execute telegram-conversations \
  --command "INSERT INTO user_deposits (user_id, balance) VALUES (999, -500)"
# Expected: Success (no CHECK constraint)

Rollback Time: < 1 second

---

Production Deployment Timeline

Estimated Duration: 5 minutes

Time	Step	Duration
T+0	Backup database	1 min
T+1	Run migration	< 10 sec
T+1.5	Verify success	30 sec
T+2	Test bot functionality	1 min
T+3	Monitor logs	2 min

Total: ~5 minutes including buffer

---

Next Steps

Before Deployment

1. Review Documentation

   • Read SCHEMA_MIGRATION_GUIDE.md (13K)
   • Review TEST_RESULTS.md (8K)

2. Check Production Data

   # Check for negative balances
   wrangler d1 execute telegram-conversations \
     --command "SELECT * FROM user_deposits WHERE balance < 0"
   
   # Check for long names
   wrangler d1 execute telegram-conversations \
     --command "SELECT id, depositor_name, length(depositor_name) as len
                FROM deposit_transactions WHERE length(depositor_name) > 50"
   

3. Prepare Backup

   wrangler d1 execute telegram-conversations \
     --command ".dump" > backup_$(date +%Y%m%d_%H%M%S).sql
   

After Deployment

1. Integrate Audit Logging

   • Add audit log calls to deposit-agent.ts
   • Add audit log calls to domain-register.ts
   • See migrations/AUDIT_LOG_EXAMPLES.ts for implementation

2. Monitor System

   • Watch logs for constraint violations
   • Review audit logs for suspicious activity
   • Verify no performance degradation

3. Create Admin Dashboard (Future Enhancement)

   • Query audit logs for insights
   • Display user activity history
   • Track deposit/withdrawal trends

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Support & Troubleshooting

Common Issues

Issue: "CHECK constraint failed: balance >= 0" Solution: This is expected - constraint is working correctly. Fix the code attempting to set negative balance.

Issue: Migration fails mid-execution Solution: Run rollback script, fix issues, retry migration

Issue: "Table already exists" error Solution: Drop audit_logs table first, then re-run migration

Getting Help

1. Documentation: SCHEMA_MIGRATION_GUIDE.md (troubleshooting section)
2. Test Results: TEST_RESULTS.md (edge cases)
3. Examples: AUDIT_LOG_EXAMPLES.ts (usage patterns)

Emergency Contact

If critical failure occurs:

1. Run rollback immediately: migrations/001_rollback.sql
2. Restore from backup if necessary
3. Review logs: wrangler tail
4. Check SCHEMA_MIGRATION_GUIDE.md troubleshooting section

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Conclusion

✅ Migration is production-ready

Key Points:

• Thoroughly tested locally
• Zero data loss
• Fast execution (< 1 second)
• Reversible (rollback available)
• Comprehensive documentation

Recommendation: Deploy to production during low-traffic period (optional, but recommended for monitoring)

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Additional Resources

Resource	Purpose	Size
SCHEMA_MIGRATION_GUIDE.md	Complete deployment guide	13K
migrations/TEST_RESULTS.md	Test verification	8K
migrations/AUDIT_LOG_EXAMPLES.ts	Usage examples	11K
migrations/001_schema_enhancements.sql	Migration script	5.5K
migrations/001_rollback.sql	Rollback script	4K

Total Documentation: ~42K

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Created: 2026-01-19 Author: Claude Code Version: 1.0