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Pull Request: Deadline Enforcement for Escrows

🔗 Create PR Link

https://github.com/DavisVT/Vaultix/pull/new/feature/deadline-enforcement

📋 PR Title

feat: Implement comprehensive deadline enforcement for escrows

📝 PR Description

## Overview
This PR implements comprehensive deadline enforcement to prevent escrows from remaining in limbo indefinitely.

## Changes Made

### Core Implementation
- ✅ Added `EXPIRED` status as a terminal state
- ✅ Created `POST /escrows/:id/expire` endpoint
- ✅ Updated state machine to support expiration transitions
- ✅ Added guards preventing operations on expired escrows
- ✅ Updated scheduler to auto-expire overdue escrows

### Key Features
- **Explicit Lifecycle Rules**: PENDING/ACTIVE/DISPUTED → EXPIRED (terminal)
- **Authorization**: Only depositor (creator) or arbitrator can trigger expiration
- **Deadline Validation**: Must have `expiresAt` and current time must exceed it
- **Automatic Processing**: Hourly cron job auto-expires overdue escrows
- **Operation Guards**: Blocks fulfill, confirm, and release on expired escrows
- **Event Tracking**: Full audit trail with EXPIRED events and webhooks

### Testing
- ✅ 8 comprehensive service tests covering all scenarios
- ✅ 5 state machine tests for EXPIRED transitions
- ✅ All tests validate authorization, timing, and edge cases
- ✅ No TypeScript diagnostics errors

### Documentation
- 📄 `DEADLINE_ENFORCEMENT.md` - Comprehensive implementation guide
- 📄 `EXPIRATION_EXAMPLE.md` - Practical usage examples
- 📄 `QUICK_REFERENCE_EXPIRATION.md` - Developer quick reference
- 📄 `DEADLINE_ENFORCEMENT_CHANGES.md` - Detailed change summary
- 📄 `IMPLEMENTATION_CHECKLIST.md` - Deployment checklist

## Requirements Fulfilled

✅ Define clear lifecycle phases with EXPIRED state  
✅ Implement deadline-based behaviors using current time  
✅ Allow depositor to trigger timeout resolution  
✅ Allow arbitrator to trigger expiration  
✅ Enforce invariants (no ops after expiry, no expiry of terminal states)  
✅ Emit EXPIRED events with full context  
✅ Handle interactions with disputes and conditions  
✅ Comprehensive test coverage  

## API Changes

### New Endpoint
```http
POST /escrows/:id/expire
Authorization: Bearer <token>
Content-Type: application/json

{
  "reason": "optional"
}

New Status

  • EXPIRED - Terminal state for overdue escrows

Blocked Operations After Expiry

  • ❌ Fulfill conditions
  • ❌ Confirm conditions
  • ❌ Release escrow

Files Changed (14 files, +1005 lines, -14 lines)

New Files

  • apps/backend/DEADLINE_ENFORCEMENT_CHANGES.md
  • apps/backend/IMPLEMENTATION_CHECKLIST.md
  • apps/backend/docs/DEADLINE_ENFORCEMENT.md
  • apps/backend/docs/EXPIRATION_EXAMPLE.md
  • apps/backend/docs/QUICK_REFERENCE_EXPIRATION.md
  • apps/backend/src/modules/escrow/dto/expire-escrow.dto.ts

Modified Files

  • apps/backend/src/modules/escrow/controllers/escrow.controller.ts
  • apps/backend/src/modules/escrow/entities/escrow-event.entity.ts
  • apps/backend/src/modules/escrow/entities/escrow.entity.ts
  • apps/backend/src/modules/escrow/escrow-state-machine.spec.ts
  • apps/backend/src/modules/escrow/escrow-state-machine.ts
  • apps/backend/src/modules/escrow/services/escrow-scheduler.service.ts
  • apps/backend/src/modules/escrow/services/escrow.service.spec.ts
  • apps/backend/src/modules/escrow/services/escrow.service.ts

Migration Impact

  • ✅ Backward compatible
  • ✅ No database migration required
  • ✅ Existing escrows without expiresAt unaffected
  • ⚠️ Requires app restart to load new enum values

Testing Instructions

Manual Testing

  1. Create escrow with deadline in the past
  2. Call POST /escrows/:id/expire as depositor
  3. Verify status changed to EXPIRED
  4. Try to fulfill/confirm conditions (should fail with 400)
  5. Check events table for EXPIRED event
  6. Verify webhook dispatched

Automated Testing

cd apps/backend
npm test -- escrow.service.spec.ts
npm test -- escrow-state-machine.spec.ts

Deployment Checklist

  • Review code changes
  • Run full test suite
  • Deploy to staging
  • Test scheduler execution
  • Verify webhook delivery
  • Update API documentation
  • Notify frontend team
  • Deploy to production
  • Monitor logs

Checklist

  • Code follows project style guidelines
  • Tests added and passing
  • Documentation updated
  • No TypeScript errors
  • Backward compatible
  • Ready for review

Screenshots/Examples

See apps/backend/docs/EXPIRATION_EXAMPLE.md for detailed usage examples.

Related Issues

Closes deadline enforcement requirements for preventing escrows from remaining in limbo indefinitely.


## 🚀 Next Steps

1. Open the link above in your browser
2. Copy the PR description from this file
3. Paste it into the PR description field
4. Click "Create Pull Request"
5. Request reviews from team members
6. Address any feedback
7. Merge when approved

## 📊 Summary

- **Branch**: `feature/deadline-enforcement`
- **Base**: `main`
- **Files Changed**: 14
- **Lines Added**: 1005
- **Lines Removed**: 14
- **Tests Added**: 13
- **Documentation Files**: 5