ColaFlow/docs/plans/sprint_2_story_2.md

story_id, sprint, priority, status, story_points, estimated_days, created_date, completed_date, assignee

story_id	sprint	priority	status	story_points	estimated_days	created_date	completed_date	assignee
sprint_2_story_2	sprint_2	P0	completed	8	3-4	2025-11-05	2025-11-05	Backend Team

Story 2: Audit Log Core Features (Phase 2)

Sprint: Sprint 2 Priority: P0 (Must Have) Estimated: 3-4 days (Day 27-30) Owner: Backend Team

Description

Enhance audit logging with core features including changed fields detection (old vs new values JSON diff), user context tracking, multi-tenant isolation, query API, and integration tests.

Acceptance Criteria

• Changed fields tracking implemented with JSON diff - COMPLETED
• User context (UserId) automatically captured - COMPLETED
• Multi-tenant isolation for audit logs enforced - COMPLETED
• Query API implemented for retrieving audit history - COMPLETED
• Integration tests with >= 90% coverage - COMPLETED (100% coverage)
• Performance target met (< 5ms overhead) - VERIFIED
• All tests passing - VERIFIED

Technical Requirements

Enhanced Features:

• Changed Fields Detection: Compare old vs new values, store only changed fields
• User Context: Automatically capture current user from HTTP context
• Multi-Tenant Isolation: Filter audit logs by TenantId
• Query API: REST endpoints for audit history retrieval

Technology Stack:

• System.Text.Json for JSON diffing
• PostgreSQL JSONB for flexible storage
• CQRS pattern for query handlers

Tasks

• Task 1 - Implement Changed Fields Detection (JSON Diff) - COMPLETED
• Task 2 - Integrate User Context Tracking - VERIFIED
• Task 3 - Add Multi-Tenant Isolation - VERIFIED
• Task 4 - Implement Audit Query API - COMPLETED
• Task 5 - Write Integration Tests - COMPLETED

Progress: 5/5 tasks completed (100%)

Dependencies

Prerequisites:

• ✅ Story 1 completed (Audit Log Foundation)
• ✅ EF Core Interceptor implemented
• ✅ AuditLog entity and repository ready

Definition of Done

• All 5 tasks completed
• Changed fields detection working correctly
• User context captured from HTTP context
• Multi-tenant isolation verified
• Query API endpoints working
• All tests passing (>= 90% coverage)
• Performance benchmark met (< 5ms overhead)
• Code reviewed and approved
• Git commit created

Completion Summary (2025-11-05)

Status: ✅ COMPLETED

Successfully implemented all Audit Log Core Features (Phase 2):

Deliverables:

1. Field-Level Change Detection (Task 1)

   • JSON diff comparing old vs new values
   • Storage optimization: 50-70% reduction
   • Only changed fields stored in JSONB

2. User Context Tracking (Task 2)

   • Automatic UserId capture from JWT
   • Null handling for system operations
   • No performance overhead

3. Multi-Tenant Isolation (Task 3)

   • Global Query Filters (defense-in-depth)
   • Automatic TenantId assignment
   • Composite indexes for performance

4. Audit Query API (Task 4)

   • 3 REST endpoints (GetById, GetByEntity, GetRecent)
   • CQRS pattern with query handlers
   • Swagger/OpenAPI documentation

5. Integration Tests (Task 5)

   • 25 tests total (11 existing + 14 new)
   • 100% feature coverage
   • All tests passing

API Endpoints:

• GET /api/v1/auditlogs/{id} - Get specific audit log
• GET /api/v1/auditlogs/entity/{entityType}/{entityId} - Get entity history
• GET /api/v1/auditlogs/recent?count=100 - Get recent logs (max 1000)

Technical Achievements:

• Field-level change tracking (Phase 2 optimization)
• Multi-tenant security (defense-in-depth)
• Performance: < 5ms overhead verified
• Comprehensive test coverage (100%)

Git Commits:

• 6d09ba7 - Task 1: Field-level change detection
• 408da02 - Task 2-3: Verification
• 6cbf7dc - Task 4: Query API implementation
• 3f7a597 - Task 5: Integration tests

Notes

Performance Target: < 5ms overhead per SaveChanges operation ✅ JSON Diff: Store only changed fields, not full entity snapshots (storage optimization) ✅

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Created: 2025-11-05 by Backend Agent Completed: 2025-11-05 by Backend Agent