Find slow database queries by fingerprint

SELECT
  query_fingerprint,
  service,
  database_name,
  COUNT(*) AS executions,
  SUM(CASE WHEN duration_ms >= 1000 THEN 1 ELSE 0 END) AS slow_executions,
  100.0 * SUM(CASE WHEN duration_ms >= 1000 THEN 1 ELSE 0 END)
    / NULLIF(COUNT(*), 0) AS slow_query_rate_pct,
  AVG(duration_ms) AS average_duration_ms,
  MAX(duration_ms) AS maximum_duration_ms
FROM database_query_events
WHERE timestamp_utc >= now() - INTERVAL '30 days'
  AND environment = 'production'
GROUP BY query_fingerprint, service, database_name
HAVING COUNT(*) >= 10
ORDER BY slow_query_rate_pct DESC, executions DESC
LIMIT 20;