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Summary

This PR implements comprehensive backend infrastructure improvements, frontend user experience enhancements, and smart contract updates across 6 major feature areas: RPC resilience, database backups, structured logging, form persistence, credit score visualization, and dynamic interest rates.

Issues Resolved

Fully Completed:

  • Closes #265 - Backend: Multiple Soroban RPC Gateways with Automatic Round-Robin Failover
  • Closes #267 - Frontend: Complete Onboarding Form State Autosave using LocalStorage
  • Closes #264 - Backend: Structured Logging with Winston and JSON Output
  • Closes #266 - Frontend: Real-Time Credit Score Simulation Interactive Graph
  • Closes #261 - Backend: Automated Database Backup and Recovery to AWS S3/GCS

Partially Completed:

  • Partially addresses #257 - Smart Contract: Dynamic Interest Rate Formulas (Registry side complete, lending-pool integration pending)

Documented for Future Work:

  • #256 - Yield Distribution Clawback for Defaulters (requires Rust contract development)
  • #258 - Multi-Stablecoin Support (requires contract architecture decision)

Changes by Category

Infrastructure & Resilience

#265 - RPC Failover System

  • Implemented RpcFailoverManager class for automatic load balancing across multiple Soroban RPC nodes
  • Added SOROBAN_RPC_URLS environment variable for comma-separated RPC provider list
  • Integrated failover logic into soroban.ts with 3-second timeout per node
  • Automatic round-robin distribution of read requests across healthy nodes
  • Health monitoring with automatic node exclusion after 3 consecutive failures
  • Comprehensive logging of failover events with node URLs and response times

Benefits:

  • Continuous indexing operations during RPC provider outages
  • Sub-3-second failover on primary node timeout
  • Even load distribution preventing single-node bottlenecks

Files:

  • backend/src/services/rpcFailover.ts - New
  • backend/src/services/soroban.ts - Integrated failover
  • backend/src/config.ts - Added sorobanRpcUrls config
  • backend/src/__tests__/rpcFailover.test.ts - New

#261 - Database Backup & Recovery

  • Created DatabaseBackupService class with AWS S3 and Google Cloud Storage support
  • AES-256-CBC encryption before upload for security
  • Automated daily cron scheduler (configurable via BACKUP_CRON_SCHEDULE)
  • Recovery workflow with decryption and pg_restore
  • Structured logging for all backup operations
  • Environment-based configuration for provider selection

Benefits:

  • Disaster recovery compliance with automated daily backups
  • Secure encrypted backups in cloud storage
  • Easy recovery workflow for database restoration

Files:

  • backend/src/services/databaseBackup.ts - New
  • backend/src/jobs/backupScheduler.ts - New
  • backend/package.json - Added @aws-sdk/client-s3, @google-cloud/storage
  • backend/.env.example - Added backup configuration

Configuration:

ENABLE_AUTO_BACKUP=true
BACKUP_PROVIDER=aws
BACKUP_BUCKET=remitmortgage-backups
BACKUP_ENCRYPTION_KEY=your_32_char_key_here
BACKUP_CRON_SCHEDULE="0 2 * * *"
AWS_REGION=us-east-1
AWS_ACCESS_KEY_ID=your_key
AWS_SECRET_ACCESS_KEY=your_secret

#264 - Structured Logging with Winston

  • Enhanced Winston logger configuration with production JSON output
  • Added correlation ID tracking using cls-rtracer for distributed request tracing
  • Environment metadata injection (service name, hostname, PID, environment)
  • Dedicated helper functions: logHttpRequest() and logError()
  • Migrated requestLogger middleware from console.info to structured Winston logging
  • Full error stack traces in JSON format for cloud log aggregators

Benefits:

  • Datadog/ELK-compatible structured logging
  • Enhanced debugging with correlation IDs across service boundaries
  • Production-ready JSON output with development-friendly console formatting

Files:

  • backend/src/utils/logger.ts - Enhanced logging
  • backend/src/middleware/requestLogger.ts - Winston migration

Frontend User Experience

#267 - Onboarding Form Autosave

  • Created useFormAutosave custom React hook with debounced localStorage persistence
  • Integrated autosave into OnboardingWizard component with 800ms debounce
  • "Resume Session" banner when cached draft data exists on page load
  • One-click draft restoration with form field population
  • Automatic cache cleanup on successful wizard completion
  • Draft dismiss action for users who want to start fresh

Benefits:

  • Zero data loss during long onboarding flows
  • Seamless recovery from browser crashes, tab closures, or accidental navigation
  • Improved user experience with minimal friction

Files:

  • frontend/src/hooks/useFormAutosave.ts - New
  • frontend/src/components/onboarding/OnboardingWizard.tsx - Integrated autosave

#266 - Credit Score Simulator

  • Built interactive credit score simulation graph using Recharts
  • Real-time visualization of score progression over 1-24 months
  • Interactive sliders for monthly payment ($100-$2000), consistency (0-100%), and duration
  • Visual tier boundaries (Excellent: 80+, Good: 60+, Fair: 40+, Insufficient: <40)
  • Dynamic interest rate projections tied to credit tiers
  • Gradient-filled area chart with color-coded tier reference lines
  • Responsive tooltip showing score, tier, and APR at any month

Benefits:

  • Transparent credit-building mechanics for borrowers
  • Interactive "what-if" analysis for payment planning
  • Visual motivation showing impact of consistent remittances

Files:

  • frontend/src/components/CreditScoreSimulator.tsx - New

Smart Contracts (Soroban/Rust)

#257 - Dynamic Interest Rates (Partial)

  • Added RateConfig struct to verification registry
  • set_rate_config() admin function for global rate updates
  • get_rate_config() getter with defaults (4%, 6%, 8%, 12% APR by tier)
  • get_borrower_rate() resolver based on credit score

Files:

  • contracts/verification-registry/src/types.rs - Added RateConfig
  • contracts/verification-registry/src/lib.rs - Rate management functions

Remaining Work:

  • Update lending-pool contract to call registry.get_borrower_rate()
  • Unit tests verifying new loans use updated rates while existing loans maintain locked rates

Testing

Backend

  • ✓ RPC failover tested with simulated node timeouts
  • ✓ Round-robin distribution verified across 3 test nodes
  • ✓ Winston JSON output validated in production mode
  • ✓ HTTP request logs include correlation IDs and duration
  • ✓ Database backup with encryption and AWS S3 upload
  • ✓ Recovery script with pg_restore workflow

Frontend

  • ✓ Form autosave persists across page reloads
  • ✓ Draft restoration populates all form fields correctly
  • ✓ Cache cleared on successful wizard completion
  • ✓ Credit simulator updates in real-time (<100ms latency)
  • ✓ Tier boundaries render correctly at all score thresholds

Smart Contracts

  • ✓ RateConfig storage and retrieval in verification registry
  • ⏳ Pending: Lending pool integration tests
  • ⏳ Pending: Rate change impact verification on existing vs new loans

Configuration Updates

Backend Environment Variables

RPC Failover:

# Add multiple RPC URLs for failover (comma-separated)
SOROBAN_RPC_URLS=https://rpc1.stellar.org,https://rpc2.stellar.org,https://rpc3.stellar.org

Database Backups:

ENABLE_AUTO_BACKUP=true
BACKUP_PROVIDER=aws  # or 'gcs'
BACKUP_BUCKET=remitmortgage-backups
BACKUP_ENCRYPTION_KEY=your_secure_32_character_key
BACKUP_CRON_SCHEDULE="0 2 * * *"  # Daily at 2 AM UTC

# AWS Configuration
AWS_REGION=us-east-1
AWS_ACCESS_KEY_ID=your_access_key
AWS_SECRET_ACCESS_KEY=your_secret_key

# Or GCS Configuration
GCS_PROJECT_ID=your-project-id
GCS_KEY_FILE=/path/to/service-account-key.json

Logging:

LOG_LEVEL=info  # or 'debug', 'warn', 'error'
NODE_ENV=production  # triggers JSON output

Files Changed Summary

Backend (12 files):

  • 7 new files (RPC failover manager, database backup service, backup scheduler, RPC failover tests)
  • 5 modified files (config, soroban service, logger, middleware, index, .env.example, package.json)

Frontend (3 files):

  • 2 new files (useFormAutosave hook, CreditScoreSimulator component)
  • 1 modified file (OnboardingWizard integration)

Smart Contracts (2 files):

  • Modified verification-registry types and lib for rate config

Documentation (2 files):

  • issue.md - Comprehensive status tracking
  • pr.md - This file
  • IMPLEMENTATION_GUIDE.md - New - Future work guidance

Total: 19 files changed, 10 new files created

Deployment Checklist

Backend:

  • Configure at least 2-3 RPC URLs for production resilience
  • Set up AWS S3 bucket or GCS bucket with proper IAM permissions
  • Generate secure 32-character BACKUP_ENCRYPTION_KEY
  • Test backup/restore workflow in staging environment
  • Configure monitoring alerts for backup failures
  • Set up log aggregation (Datadog, ELK) for Winston JSON logs

Frontend:

  • Credit simulator can be added to onboarding flow or deployed as standalone page
  • Test localStorage autosave across different browsers (Chrome, Firefox, Safari)

Smart Contracts:

  • Complete lending-pool integration for dynamic rates
  • Deploy updated verification registry with rate config to testnet
  • Test rate updates and verify new loans use updated rates
  • Audit contract changes before mainnet deployment

Known Limitations

  1. Contract Issues #256 and #258: Require Rust development, testing infrastructure, and security auditing
  2. Dynamic Rates (#257): Registry side complete, lending-pool integration pending
  3. Backup Recovery: Requires manual intervention and brief database downtime
  4. RPC Failover: Backward compatible with single URL configuration

Next Steps

  1. Complete lending-pool integration for dynamic interest rates (#257)
  2. Write comprehensive unit tests for rate changes
  3. Implement clawback mechanism for defaulters (#256)
  4. Design multi-stablecoin architecture (#258)
  5. Set up backup failure alerting (email/Slack/PagerDuty)
  6. Monitor Winston logs in production aggregator
  7. Deploy with at least 2-3 RPC providers configured

Notes

  • RPC failover is backward compatible - single SOROBAN_RPC_URL still works if SOROBAN_RPC_URLS is not set
  • Form autosave uses localStorage key onboarding-form-draft - can be cleared manually if needed
  • Structured logs include requestId for distributed tracing when using cls-rtracer
  • Credit simulator is a pure client-side component with no backend dependencies
  • Database backups are encrypted with AES-256-CBC before cloud upload