-- 指标聚合表唯一约束：GORM 的 ON CONFLICT upsert 需要唯一索引才能真正生效。 // Logan.Li
DELETE FROM monitor_metric_aggregates a
USING monitor_metric_aggregates b
WHERE a.hostname = b.hostname
  AND a.metric = b.metric
  AND a.interval = b.interval
  AND a.bucket_time = b.bucket_time
  AND a.id < b.id;

CREATE UNIQUE INDEX IF NOT EXISTS uniq_metric_agg ON monitor_metric_aggregates (hostname, metric, interval, bucket_time);