# Salary Enhancement Deployment Checklist

## Pre-Deployment Preparation

### Database Preparation
- [ ] **Backup Production Database**
  ```bash
  pg_dump -h $DB_HOST -U $DB_USER -d $DB_NAME > backup_$(date +%Y%m%d_%H%M%S).sql
  ```

- [ ] **Test Migration on Staging**
  ```bash
  npm run migration:run
  npm run validate:migration
  ```

- [ ] **Verify Migration Rollback**
  ```bash
  npm run migration:revert
  npm run migration:run
  ```

- [ ] **Check Database Permissions**
  - Verify migration user has ALTER TABLE permissions
  - Confirm enum creation permissions
  - Test column addition permissions

### Code Quality Assurance
- [ ] **All Tests Passing**
  ```bash
  npm test
  npm run test:e2e
  ```

- [ ] **Property-Based Tests Validated**
  - All 9 salary-related properties passing
  - Currency formatting tests passing
  - Duration validation tests passing

- [ ] **Code Review Completed**
  - Migration script reviewed
  - API changes reviewed
  - Mobile integration reviewed

- [ ] **Documentation Updated**
  - API documentation complete
  - Deployment strategy documented
  - Rollback procedures documented

### Infrastructure Readiness
- [ ] **Staging Environment Validated**
  - Database schema matches production
  - Application deployment successful
  - API endpoints responding correctly

- [ ] **Monitoring Setup**
  - Database performance monitoring enabled
  - API error rate monitoring configured
  - Mobile app crash reporting ready

- [ ] **Team Notification**
  - Deployment team notified
  - Support team briefed on changes
  - Rollback contacts confirmed

## Deployment Execution

### Phase 1: Database Migration
- [ ] **Start Deployment Window**
  - Notify stakeholders of deployment start
  - Enable maintenance mode if required
  - Begin monitoring enhanced alerting

- [ ] **Execute Migration**
  ```bash
  npm run migration:run
  ```

- [ ] **Validate Migration Success**
  ```bash
  npm run migration:show
  npm run validate:migration
  ```

- [ ] **Verify Data Integrity**
  - Check existing job records preserved
  - Validate new columns created correctly
  - Confirm enum constraints applied

### Phase 2: Application Deployment
- [ ] **Deploy Backend Application**
  ```bash
  npm run build
  npm run start:prod
  ```

- [ ] **Health Check API**
  ```bash
  curl -f http://localhost:3000/health || exit 1
  ```

- [ ] **Test New Endpoints**
  - POST /jobs with salary fields
  - GET /jobs with salary filtering
  - PUT /jobs with salary updates

- [ ] **Verify Backward Compatibility**
  - Test legacy salaryRange field handling
  - Confirm older mobile clients still work
  - Validate API response format

### Phase 3: Validation and Monitoring
- [ ] **Functional Testing**
  - Create job with structured salary
  - Update existing job with salary info
  - Retrieve jobs with salary filtering

- [ ] **Performance Validation**
  - API response times within limits
  - Database query performance acceptable
  - No memory leaks detected

- [ ] **Error Rate Monitoring**
  - API error rates normal
  - Database connection errors normal
  - Mobile app crash rates stable

## Post-Deployment Validation

### Immediate Checks (0-2 hours)
- [ ] **System Health**
  - All services running normally
  - Database connections stable
  - API endpoints responding

- [ ] **User Experience**
  - Job creation workflow functional
  - Salary display formatting correct
  - Mobile app salary input working

- [ ] **Data Validation**
  - New jobs saving with structured salary
  - Existing jobs displaying correctly
  - Currency formatting accurate

### Short-term Monitoring (2-24 hours)
- [ ] **Performance Metrics**
  - Response time trends normal
  - Database performance stable
  - Memory usage within limits

- [ ] **Error Analysis**
  - No increase in API errors
  - No database constraint violations
  - No mobile app crashes related to salary

- [ ] **User Feedback**
  - Support tickets reviewed
  - User experience feedback collected
  - Mobile app store reviews monitored

### Long-term Validation (1-7 days)
- [ ] **Feature Adoption**
  - Usage of new salary fields tracked
  - User engagement with salary filters
  - Mobile app feature utilization

- [ ] **System Stability**
  - No performance degradation
  - Database growth patterns normal
  - API reliability maintained

## Rollback Procedures

### Emergency Rollback Triggers
- [ ] **Critical Issues Detected**
  - Data corruption or loss
  - Severe performance degradation
  - High error rates (>5% increase)
  - Mobile app crashes (>10% increase)

### Rollback Execution
- [ ] **Database Rollback**
  ```bash
  npm run migration:revert
  ```

- [ ] **Application Rollback**
  - Deploy previous application version
  - Verify API functionality
  - Test mobile app compatibility

- [ ] **Validation After Rollback**
  - Confirm system stability
  - Verify data integrity
  - Test user workflows

### Post-Rollback Actions
- [ ] **Issue Analysis**
  - Document rollback reasons
  - Analyze failure points
  - Plan remediation strategy

- [ ] **Communication**
  - Notify stakeholders of rollback
  - Update support team
  - Communicate timeline for fix

## Success Criteria

### Technical Success Metrics
- [ ] Migration completes without errors
- [ ] All property-based tests pass
- [ ] API response times < 200ms (95th percentile)
- [ ] Error rates remain < 1%
- [ ] Database performance within 10% of baseline

### Business Success Metrics
- [ ] Users can create jobs with salary info
- [ ] Job seekers see improved salary display
- [ ] No disruption to existing workflows
- [ ] Mobile app provides enhanced experience
- [ ] Support ticket volume remains normal

## Team Contacts

### Primary Contacts
- **Deployment Lead**: [Name] - [Contact]
- **Database Administrator**: [Name] - [Contact]
- **Backend Developer**: [Name] - [Contact]
- **Mobile Developer**: [Name] - [Contact]

### Emergency Contacts
- **On-Call Engineer**: [Phone] - [Email]
- **Technical Lead**: [Phone] - [Email]
- **Product Manager**: [Phone] - [Email]

### Communication Channels
- **Deployment Channel**: #deployment-salary-enhancement
- **Emergency Channel**: #critical-issues
- **Status Updates**: #general-updates

---

**Deployment Date**: _______________  
**Deployment Lead**: _______________  
**Approved By**: _______________  

**Notes**:
_Use this space to document any deployment-specific notes, deviations from the plan, or lessons learned._