Add typed EVTX stats/security query executors

[PrzemyslawKlys]

Adds EVTX stats/security typed query contracts and executors in EventViewerX, moving provider/event-id defaults and top-row shaping into the engine. Validation: dotnet build Sources/EventViewerX/EventViewerX.csproj -c Release.

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[claude]

Claude finished @PrzemyslawKlys's task —— View job

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Code Review Complete

I've thoroughly reviewed the PR that adds typed EVTX stats/security query executors to EventViewerX. Here's my comprehensive assessment:

Todo List:

• Read repository guidelines (CLAUDE.md - not found)
• Analyze SecurityEvtxQueryContracts.cs
• Analyze SecurityEvtxQueryExecutor.cs
• Analyze EvtxStatsQueryContracts.cs
• Analyze EvtxStatsQueryExecutor.cs
• Check for existing test patterns and coverage
• Compile comprehensive review feedback
• Post final review

Review Feedback

🟢 Overall Assessment: Excellent Code Quality

This is a well-structured, defensive, and maintainable implementation that follows solid C# practices.

Strengths

1. Code Quality & Structure

• Excellent separation of concerns: Contracts cleanly separated from executors
• Consistent patterns: All three security report types follow identical structure and validation patterns
• Strong typing: Comprehensive use of typed contracts instead of generic dictionaries
• Proper encapsulation: Well-designed sealed classes with appropriate access modifiers

2. Security & Safety

• Comprehensive input validation: All user inputs are validated with clear error messages
• Safe error handling: Consistent Try* pattern with proper failure objects
• No sensitive data exposure: Event log analysis is defensive in nature
• Immutable collections: Proper use of IReadOnlyList<> for public APIs

3. Performance Considerations

• Cancellation support: All methods accept CancellationToken for responsive cancellation
• Memory efficient: Uses static lambdas in LINQ operations (e.g., lines 59, 62, 65, 68-69 in EvtxStatsQueryExecutor.cs)
• Proper truncation: Implements MaxEventsScanned limits to prevent resource exhaustion
• Efficient aggregation: Delegates heavy lifting to existing proven report builders

4. API Design

• Excellent documentation: Comprehensive XML comments on all public members
• Intuitive defaults: Sensible defaults like Top = 20, SampleSize = 20
• Flexible filtering: Support for time ranges, event IDs, provider filtering
• Consistent return values: Uniform result objects across all report types

Areas for Consideration

Minor Issues

1. Parameter validation in EvtxStatsQueryExecutor.cs:128:

   if (request.TopEventIds < 0 || request.TopProviders < 0 || request.TopComputers < 0 || request.TopLevels < 0)

   Consider extracting to separate validation methods for each property with specific error messages.

2. Magic numbers: Event IDs are hardcoded constants (4624, 4625, 4634, 4647, 4740). Consider documenting their meanings:

   private const int EventIdSuccessfulLogon = 4624;    // An account was successfully logged on
   private const int EventIdFailedLogon = 4625;       // An account failed to log on  
   private const int EventIdLogoff = 4634;            // An account was logged off
   private const int EventIdExplicitLogoff = 4647;    // User initiated logoff
   private const int EventIdAccountLockout = 4740;    // A user account was locked out

3. Missing null checks: In SecurityEvtxQueryContracts.cs, properties like FilePath default to string.Empty but could benefit from explicit required modifier (C# 11+) or constructor validation.

Test Coverage

✅ Good news: The codebase has existing test infrastructure with similar patterns:

• TestEvtxStatsReportBuilder.cs - Tests similar stats functionality
• TestLiveStatsQueryExecutor.cs - Tests similar executor patterns

❓ Recommendation: Consider adding unit tests for the new executors following the existing patterns, particularly:

• Validation logic testing (invalid file paths, negative values, invalid time ranges)
• Error handling scenarios
• Contract mapping accuracy

Performance & Security Assessment

• ✅ No performance bottlenecks detected - Proper use of existing optimized report builders
• ✅ No security vulnerabilities - This is defensive security tooling for log analysis
• ✅ Memory management - Appropriate use of readonly collections and proper disposal patterns via existing infrastructure
• ✅ Thread safety - Static executors with no shared state

Validation Build

The PR description mentions: dotnet build Sources/EventViewerX/EventViewerX.csproj -c Release - this is appropriate validation for the changes.

Final Recommendation: ✅ APPROVE

This PR demonstrates excellent software engineering practices and is ready for merge. The code is production-ready, follows established patterns, and adds valuable typed query functionality to the EventViewerX library.

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