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DashBoard/openspec/changes/archive/2026-02-26-admin-perf-vue-migration-monitoring-gaps/specs/admin-performance-spa/spec.md
egg 07ced80fb0 feat(admin-perf): full Vue SPA migration + slow-query/memory monitoring gaps 
Remove Jinja2 template fallback (1249 lines) — /admin/performance now serves
Vue SPA exclusively via send_from_directory.

Backend:
- Add _SLOW_QUERY_WAITING counter with get_slow_query_waiting_count()
- Record slow-path latency in read_sql_df_slow/iter via record_query_latency()
- Extend metrics_history schema with slow_query_active, slow_query_waiting,
  worker_rss_bytes columns + ALTER TABLE migration for existing DBs
- Add cleanup_archive_logs() with configurable ARCHIVE_LOG_DIR/KEEP_COUNT
- Integrate archive cleanup into MetricsHistoryCollector 50-min cycle

Frontend:
- Add slow_query_active and slow_query_waiting StatCards to connection pool
- Add slow_query_active trend line to pool trend chart
- Add Worker memory (RSS MB) trend chart with preprocessing
- Update modernization gate check path to frontend style.css

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-02-26 09:48:54 +08:00

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MODIFIED Requirements

Requirement: Vue 3 SPA page replaces Jinja2 template

The /admin/performance route SHALL serve the Vite-built admin-performance.html static file directly. The Jinja2 template fallback SHALL be removed. If the SPA build artifact does not exist, the server SHALL return a standard HTTP error (no fallback rendering).

Scenario: Page loads as Vue SPA

  • WHEN user navigates to /admin/performance
  • THEN the server SHALL return the Vite-built admin-performance.html static file via send_from_directory

Scenario: Portal-shell integration

  • WHEN the portal-shell renders /admin/performance
  • THEN it SHALL load the page as a native Vue SPA (not an external iframe)

Scenario: Build artifact missing

  • WHEN the SPA build artifact admin-performance.html does not exist in static/dist/
  • THEN the server SHALL return an HTTP error (no Jinja2 fallback)

Requirement: Connection pool panel

The dashboard SHALL display connection pool saturation as a GaugeBar and stat cards showing checked_out, checked_in, overflow, max_capacity, pool_size, pool_recycle, pool_timeout, direct connection count, slow_query_active, and slow_query_waiting.

Scenario: Pool under normal load

  • WHEN pool saturation is below 80%
  • THEN the GaugeBar SHALL display in a normal color (green/blue)

Scenario: Pool near saturation

  • WHEN pool saturation exceeds 80%
  • THEN the GaugeBar SHALL display in a warning color (yellow/orange/red)

Scenario: Slow query metrics displayed

  • WHEN db_pool.status includes slow_query_active and slow_query_waiting
  • THEN the panel SHALL display StatCards for both values

REMOVED Requirements

Requirement: Jinja2 template fallback for performance page

Reason: The Vue SPA is the sole UI. Maintaining a 1249-line Jinja template as fallback adds maintenance burden and feature divergence. Migration: Delete templates/admin/performance.html. The route handler serves the SPA directly.