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Performance Bonus Feature - Implementation Summary

Issue Requirements

Description: Extend the payroll items to support one-time performance bonuses separate from the recurring base salary. Bonuses should be included in the same transaction batch but identified separately in reports.

Acceptance Criteria:

  1. ✅ API supports adding one-time bonus items to a payroll run
  2. ✅ Audit logs and receipts distinguish between base and bonus
  3. ✅ Payroll engine correctly aggregates totals

What Was Already Implemented

The system already had a comprehensive bonus feature with:

  • Database schema with item_type field ('base' or 'bonus')
  • Separate tracking of total_base_amount and total_bonus_amount
  • API endpoints for adding single/batch bonus items
  • Payroll processing engine that handles both types
  • Audit logging infrastructure

What Was Enhanced

1. Audit Logs Enhancement

Files Modified:

  • backend/src/services/payrollAuditService.ts
  • backend/src/controllers/payrollBonusController.ts
  • backend/src/workers/payrollWorker.ts

Changes:

  • Added itemType parameter to audit logging methods
  • Store item_type in audit log metadata field
  • Log audit entries when bonus items are added via API
  • Log audit entries during transaction processing with item_type
  • Track bonus descriptions in metadata

Impact: Audit logs now explicitly distinguish between base salary and bonus payments in the metadata field, making it easy to filter and report on bonus-specific transactions.

2. Receipt Generation Enhancement

Files Modified:

  • backend/src/services/exportService.ts
  • backend/src/controllers/exportController.ts
  • backend/src/services/payrollBonusService.ts

Changes:

  • Updated PDF receipt to show "Performance Bonus Payment" vs "Base Salary Payment"
  • Added visual indicator (🎉) for bonus payments
  • Include bonus description/reason in receipts
  • Created getPayrollItemByTxHash() method to fetch item_type from database
  • Enrich transaction data with item_type before generating receipt

Impact: Receipts now clearly indicate whether a payment is a bonus or base salary, with bonus-specific formatting and descriptions.

3. Export Formats Enhancement

Files Modified:

  • backend/src/services/exportService.ts

Changes:

  • Excel exports now include:
    • Separate columns for base/bonus counts and totals in summary sheet
    • "Payment Type" column in transaction sheet
    • "Description" column for bonus reasons
  • CSV exports include:
    • "paymentType" column (Base Salary / Bonus)
    • "description" column

Impact: All export formats now distinguish between payment types, making it easy to analyze bonus distributions.

4. Testing

Files Created:

  • backend/src/__tests__/performanceBonusFeature.test.ts

Test Coverage:

  • Creating payroll runs with base and bonus items
  • Adding single and batch bonus items
  • Filtering items by type
  • Audit log metadata verification
  • Total aggregation accuracy (base, bonus, and combined)
  • Bonus history retrieval

5. Documentation

Files Created:

  • backend/PERFORMANCE_BONUS_FEATURE.md - Complete feature documentation
  • IMPLEMENTATION_SUMMARY.md - This file

Technical Details

Database Schema (Already Existed)

-- payroll_runs table
total_base_amount DECIMAL(20, 7) DEFAULT 0
total_bonus_amount DECIMAL(20, 7) DEFAULT 0
total_amount DECIMAL(20, 7) DEFAULT 0

-- payroll_items table
item_type VARCHAR(20) NOT NULL CHECK (item_type IN ('base', 'bonus'))
description TEXT

-- payroll_audit_logs table
metadata JSONB DEFAULT '{}'  -- Now includes item_type

API Endpoints (Already Existed)

POST   /api/v1/payroll-bonus/items/bonus          - Add single bonus
POST   /api/v1/payroll-bonus/items/bonus/batch    - Add batch bonuses
GET    /api/v1/payroll-bonus/runs/{id}/items      - Get items (filterable by type)
GET    /api/v1/payroll-bonus/bonuses/history      - Get bonus history
GET    /api/v1/exports/receipt/{txHash}/pdf       - Generate receipt (now enhanced)

Key Implementation Patterns

  1. Metadata-based Tracking: Instead of adding a new column to audit_logs, we use the existing JSONB metadata field to store item_type, maintaining backward compatibility.

  2. Enrichment Pattern: Transaction data from SDS (Stellar Data Service) is enriched with database information (item_type, description) before generating receipts.

  3. Automatic Totals: The updatePayrollRunTotals() method automatically recalculates base, bonus, and total amounts whenever items are added or removed.

  4. Audit Trail: Every bonus-related action is logged with full context (actor, IP, user agent, item_type, description).

Verification Steps

  1. API Testing:

    # Add a bonus item
curl -X POST http://localhost:4000/api/v1/payroll-bonus/items/bonus \
  -H "Content-Type: application/json" \
  -d '{"payrollRunId": 1, "employeeId": 1, "amount": "500", "description": "Q1 Bonus"}'

  2. Audit Log Verification:

    SELECT action, metadata->>'item_type', metadata->>'description'
FROM payroll_audit_logs
WHERE action = 'item_added';

  3. Receipt Generation:

    # Generate receipt for a transaction
curl http://localhost:4000/api/v1/exports/receipt/{txHash}/pdf

  4. Run Tests:

    cd backend
npm test -- performanceBonusFeature

Acceptance Criteria Verification

✅ Criterion 1: API supports adding one-time bonus items

  • Single bonus: POST /api/v1/payroll-bonus/items/bonus
  • Batch bonuses: POST /api/v1/payroll-bonus/items/bonus/batch
  • Filter by type: GET /api/v1/payroll-bonus/runs/{id}/items?itemType=bonus
  • Tests: should add a single bonus item, should add multiple bonus items in batch

✅ Criterion 2: Audit logs and receipts distinguish between base and bonus

  • Audit logs include metadata.item_type for all payroll actions
  • Receipts show "Performance Bonus Payment" vs "Base Salary Payment"
  • Exports include payment type column
  • Tests: should log bonus item addition with item_type in metadata, should log transaction success with item_type

✅ Criterion 3: Payroll engine correctly aggregates totals

  • Separate tracking: total_base_amount, total_bonus_amount, total_amount
  • Automatic recalculation on item add/delete
  • Tests: should calculate correct totals for base and bonus separately, should maintain correct totals after deleting a bonus item

Files Changed

Modified (9 files):

  1. backend/src/services/payrollAuditService.ts - Enhanced audit logging
  2. backend/src/services/exportService.ts - Updated receipt/export generation
  3. backend/src/services/payrollBonusService.ts - Added getPayrollItemByTxHash
  4. backend/src/controllers/payrollBonusController.ts - Added audit logging
  5. backend/src/controllers/exportController.ts - Enriched receipts
  6. backend/src/workers/payrollWorker.ts - Added audit logging during processing
  7. backend/src/controllers/webhook.controller.ts - Fixed merge conflict

Created (3 files):

  1. backend/src/__tests__/performanceBonusFeature.test.ts - Integration tests
  2. backend/PERFORMANCE_BONUS_FEATURE.md - Feature documentation
  3. IMPLEMENTATION_SUMMARY.md - This summary

Commit Message

feat: enhance performance bonus feature with audit logs and receipt distinction

- Add item_type (base/bonus) to audit log metadata for all payroll actions
- Update PDF receipts to distinguish between base salary and performance bonuses
- Enhance Excel/CSV exports to include payment type and bonus descriptions
- Add audit logging to payroll worker for transaction success/failure with item_type
- Add audit logging to bonus item addition in controllers
- Create getPayrollItemByTxHash method to enrich receipts with item_type
- Add comprehensive integration tests for all acceptance criteria
- Create feature documentation

Acceptance Criteria Met:
✓ API supports adding one-time bonus items to a payroll run
✓ Audit logs and receipts distinguish between base and bonus
✓ Payroll engine correctly aggregates totals (already implemented)

Next Steps

  1. Deploy to staging environment
  2. Run integration tests against staging database
  3. Verify receipt generation with real transaction data
  4. Review audit logs for proper item_type tracking
  5. Update API documentation if needed
  6. Create PR for review