Add Query Store history drill-down with multi-plan charting

[erikdarlingdata]

Summary

• Right-click "View History" on any Query Store grid row to see time-series performance history
• ScottPlot.Avalonia chart with one colored line per plan — makes plan regressions immediately visible
• 13 selectable metrics: Avg/Total CPU, Duration, Reads, Writes, Physical Reads, plus Avg Memory, Avg Rows, Executions
• SQL aggregates across execution_type (Regular/Aborted/Exception) with weighted averages
• UTC-aware: filters with GETUTCDATE(), displays local time on chart axis and grid
• Hover tooltip shows plan name, metric value, and timestamp
• Adjustable hours-back (1-720) with Refresh button

Test plan

• Build: 0 errors
• Right-click → View History opens window with chart and grid
• Multi-plan queries show separate colored lines
• Metric selector switches chart data
• Refresh reloads without stacking legends
• Rows consolidated per interval (no execution_type split)
• Hover tooltip shows nearest data point info
• Times displayed in local time, not UTC

🤖 Generated with Claude Code

Summary by CodeRabbit

• New Features
  • Added "View History" context menu option to the query grid
  • New Query Store History window for viewing performance metrics over time
  • Interactive chart visualization with selectable metrics
  • Detailed history data grid displaying per-plan execution statistics
  • Time range filtering with customizable lookback period
  • Manual refresh capability to update historical data

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 92d818f3-9fea-4290-82ca-db176da3fbfc

📥 Commits

Reviewing files that changed from the base of the PR and between c1aabc7 and 60edd37.

📒 Files selected for processing (7)

• src/PlanViewer.App/Controls/QueryStoreGridControl.axaml
• src/PlanViewer.App/Controls/QueryStoreGridControl.axaml.cs
• src/PlanViewer.App/Dialogs/QueryStoreHistoryWindow.axaml
• src/PlanViewer.App/Dialogs/QueryStoreHistoryWindow.axaml.cs
• src/PlanViewer.App/PlanViewer.App.csproj
• src/PlanViewer.Core/Models/QueryStoreHistoryRow.cs
• src/PlanViewer.Core/Services/QueryStoreService.cs

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📝 Walkthrough

Walkthrough

Introduces a new "Query Store History" feature enabling users to view historical query performance metrics. Adds a context menu option to open a new history window displaying performance data via chart and data grid, backed by a new service method fetching history from SQL Server and a data model for representing history rows.

Changes

Cohort / File(s)	Summary
QueryStoreGridControl UI Updates src/PlanViewer.App/Controls/QueryStoreGridControl.axaml, src/PlanViewer.App/Controls/QueryStoreGridControl.axaml.cs	Added "View History" context menu item with click handler that opens QueryStoreHistoryWindow with selected row data. Updated ContextMenu_Opening to enable the menu item when a row is selected.
QueryStoreHistoryWindow Component src/PlanViewer.App/Dialogs/QueryStoreHistoryWindow.axaml, src/PlanViewer.App/Dialogs/QueryStoreHistoryWindow.axaml.cs	New window component displaying query history with metric selection, hours-back filtering, ScottPlot chart visualization with color-coded per-plan series, tooltip hover interactions, and data grid showing detailed performance metrics. Async data loading with error handling and status updates.
Data Model and Service src/PlanViewer.Core/Models/QueryStoreHistoryRow.cs, src/PlanViewer.Core/Services/QueryStoreService.cs	New QueryStoreHistoryRow model with properties for plan identification, execution counts, and aggregated performance metrics. New FetchHistoryAsync service method retrieves historical stats from sys.query_store_runtime_stats via parameterized SQL query with configurable hours-back window.
Project Dependencies src/PlanViewer.App/PlanViewer.App.csproj	Added ScottPlot.Avalonia NuGet package version 5.1.57 for chart visualization support.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

✨ Finishing Touches

• 📝 Generate docstrings (stacked PR)
• 📝 Generate docstrings (commit on current branch)

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/query-store-history

📝 Coding Plan

• Generate coding plan for human review comments

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