-- v4 Kafka 积压分级采样升级验证：只读。

-- 应返回 SYSLOG_BACKLOG_RETENTION_HOURLY 一行。
SELECT table_name
FROM user_tables
WHERE table_name = 'SYSLOG_BACKLOG_RETENTION_HOURLY';

-- 应返回 22 个字段。
SELECT column_id, column_name, data_type, nullable
FROM user_tab_columns
WHERE table_name = 'SYSLOG_BACKLOG_RETENTION_HOURLY'
ORDER BY column_id;

-- 两个约束都应为 ENABLED。
SELECT constraint_name, constraint_type, status
FROM user_constraints
WHERE constraint_name IN (
  'PK_SYSLOG_BACKLOG_RET_HOURLY',
  'CK_SYSLOG_BACKLOG_RET_BPS'
)
ORDER BY constraint_name;

-- 索引应为 VALID。
SELECT index_name, uniqueness, status
FROM user_indexes
WHERE index_name = 'IDX_SYSLOG_BACKLOG_RET_UPDATED';

-- 结构验证后应能执行；首次建表且还未发生积压采样时返回 0。
SELECT COUNT(*) AS audit_row_count
FROM syslog_backlog_retention_hourly;

-- 查看每个来源小时的实际选择率。该值反映采样选择，不代表后续存储一定写入成功。
-- 没有发生积压采样时，本查询返回空属于正常。
SELECT
  source_hour,
  SUM(message_total) AS message_total,
  SUM(alarm_rows_total) AS alarm_rows_total,
  SUM(alarm_rows_saved) AS alarm_rows_saved,
  SUM(normal_rows_total) AS normal_rows_total,
  SUM(normal_rows_saved) AS normal_rows_saved,
  SUM(normal_rows_dropped) AS normal_rows_dropped,
  CASE WHEN SUM(normal_rows_total) = 0 THEN 1
       ELSE SUM(normal_rows_saved) * 1.0 / SUM(normal_rows_total) END AS normal_actual_rate,
  SUM(non_normal_rows_total) AS non_normal_rows_total,
  SUM(non_normal_rows_saved) AS non_normal_rows_saved,
  SUM(non_normal_rows_dropped) AS non_normal_rows_dropped,
  CASE WHEN SUM(non_normal_rows_total) = 0 THEN 1
       ELSE SUM(non_normal_rows_saved) * 1.0 / SUM(non_normal_rows_total) END AS non_normal_actual_rate,
  SUM(raw_total) AS raw_total,
  SUM(raw_saved) AS raw_saved,
  SUM(raw_dropped) AS raw_dropped,
  MIN(min_lag_ms) AS min_lag_ms,
  MAX(max_lag_ms) AS max_lag_ms
FROM syslog_backlog_retention_hourly
GROUP BY source_hour
ORDER BY source_hour DESC;