Add Grafana monitoring dashboard for THQ tracking system#26

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TinyKitten wants to merge 6 commits intomainfrom

claude/evaluate-grafana-integration-7ZRQz

Commits on Mar 5, 2026

Add Grafana with PostgreSQL datasource and THQ overview dashboard
claude
committed
Harden Grafana config: require admin password, fix datasource UID, use env vars for PG creds
claude
committed
Fix accuracy panels unit: use lengthmeter (m) instead of minutes
claude
committed
Fix piechart: use rowsToFields transform so log_level becomes slice labels
claude
committed
Fix accuracy unit display: use custom suffix instead of invalid unit ID
claude
committed
Add recorded_at composite indexes for Grafana dashboard queries
claude
committed