-- v4 达梦升级：创建 Kafka 积压分级采样的小时审计表。
-- 仅在 01 预检确认目标对象均不存在时执行一次，不要重复执行。

CREATE TABLE syslog_backlog_retention_hourly (
  source_hour TIMESTAMP NOT NULL,
  source_topic VARCHAR2(255) NOT NULL,
  kafka_partition INT NOT NULL,
  policy_version VARCHAR2(64) NOT NULL,
  normal_retain_bps INT NOT NULL,
  non_normal_retain_bps INT NOT NULL,
  message_total BIGINT DEFAULT 0 NOT NULL,
  alarm_rows_total BIGINT DEFAULT 0 NOT NULL,
  alarm_rows_saved BIGINT DEFAULT 0 NOT NULL,
  normal_rows_total BIGINT DEFAULT 0 NOT NULL,
  normal_rows_saved BIGINT DEFAULT 0 NOT NULL,
  normal_rows_dropped BIGINT DEFAULT 0 NOT NULL,
  non_normal_rows_total BIGINT DEFAULT 0 NOT NULL,
  non_normal_rows_saved BIGINT DEFAULT 0 NOT NULL,
  non_normal_rows_dropped BIGINT DEFAULT 0 NOT NULL,
  raw_total BIGINT DEFAULT 0 NOT NULL,
  raw_saved BIGINT DEFAULT 0 NOT NULL,
  raw_dropped BIGINT DEFAULT 0 NOT NULL,
  min_lag_ms BIGINT DEFAULT 0 NOT NULL,
  max_lag_ms BIGINT DEFAULT 0 NOT NULL,
  created_at TIMESTAMP DEFAULT SYSDATE NOT NULL,
  updated_at TIMESTAMP DEFAULT SYSDATE NOT NULL,
  CONSTRAINT pk_syslog_backlog_ret_hourly PRIMARY KEY (
    source_hour, source_topic, kafka_partition, policy_version,
    normal_retain_bps, non_normal_retain_bps
  ),
  CONSTRAINT ck_syslog_backlog_ret_bps CHECK (
    normal_retain_bps BETWEEN 0 AND 10000
    AND non_normal_retain_bps BETWEEN 0 AND 10000
  )
);

CREATE INDEX idx_syslog_backlog_ret_updated
ON syslog_backlog_retention_hourly(updated_at);

COMMENT ON TABLE syslog_backlog_retention_hourly IS
'Kafka积压分级采样小时审计；按来源小时、Topic、Partition和策略聚合';
COMMENT ON COLUMN syslog_backlog_retention_hourly.source_hour IS
'syslog-serve生成的receive_time所在小时（Asia/Shanghai）';
COMMENT ON COLUMN syslog_backlog_retention_hourly.normal_retain_bps IS
'普通标准化记录该级实际保留万分比，10000表示100%';
COMMENT ON COLUMN syslog_backlog_retention_hourly.non_normal_retain_bps IS
'非标记录该级实际保留万分比，10000表示100%';

COMMIT;