📝 Description

This PR adds comprehensive session metrics tracking to capture and store detailed information about session activities, including data masking and analysis metrics. A new session_metrics table tracks these metrics per session and info type, providing better visibility into session behavior.

🔗 Related Issue

🚀 Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📚 Documentation update
• 🎨 Style/UI update
• ♻️ Code refactor
• ⚡ Performance improvement
• ✅ Test update
• 🔧 Build configuration change
• 🧹 Chore

📋 Changes Made

• Created new session_metrics table to store per-session metrics data
• Added SessionMetrics model with fields for tracking masked and analyzed counts
• Implemented IncrementSessionMaskedMetrics function to track data masking operations
• Implemented IncrementSessionAnalyzedMetrics function to track data analysis operations
• Implemented SetSessionMetricsEndedAt function to update session end times
• Integrated metrics tracking into audit plugin lifecycle (WAL and session close)
• Integrated analyzer metrics tracking into agent transport handler
• Added database migrations (up/down) for the new session_metrics table

🧪 Testing

Test Configuration:

• Browser(s): N/A (backend changes)
• OS: macOS

Tests performed:

• Unit tests pass
• Integration tests pass
• Manual testing completed

📸 Screenshots (if applicable)

✅ Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• New and existing unit tests pass locally with my changes
• I have checked my code and corrected any misspellings

📄 Additional Notes