Implement comprehensive Diff Preview Service to show changes before AI operations.
This is the core safety mechanism for M2, enabling transparency and user approval.
Domain Layer:
- Enhanced DiffPreviewService with HTML diff generation
- Added GenerateHtmlDiff() for visual change representation
- Added FormatValue() to handle dates, nulls, and long strings
- HTML output includes XSS protection with HtmlEncode
Application Layer:
- Created DiffPreviewDto and DiffFieldDto for API responses
- DTOs support JSON serialization for REST APIs
Infrastructure Layer:
- Created PendingChangeRepository with all query methods
- Created TaskLockRepository with resource locking support
- Added PendingChangeConfiguration (EF Core) with JSONB storage
- Added TaskLockConfiguration (EF Core) with unique indexes
- Updated McpDbContext with new entities
- Created EF migration AddPendingChangeAndTaskLock
Database Schema:
- pending_changes table with JSONB diff column
- task_locks table with resource locking
- Indexes for tenant_id, api_key_id, status, created_at, expires_at
- Composite indexes for performance optimization
Service Registration:
- Registered DiffPreviewService in DI container
- Registered TaskLockService in DI container
- Registered PendingChangeRepository and TaskLockRepository
Tests:
- Created DiffPreviewServiceTests with core scenarios
- Tests cover CREATE, UPDATE, and DELETE operations
- Tests verify HTML diff generation and XSS protection
Technical Highlights:
- DiffPreview stored as JSONB using value converter
- HTML diff with color-coded changes (green/red/yellow)
- Field-level diff comparison using reflection
- Truncates long values (>500 chars) for display
- Type-safe enum conversions for status fields
Story: Sprint 5, Story 5.9 - Diff Preview Service Implementation
Priority: P0 CRITICAL
Story Points: 5 (2 days)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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