-- v3 达梦升级：为事实事务外的可靠日统计投影建立 Outbox 和消费幂等表。
-- 仅在 01 预检通过后执行一次；不要重复执行。

CREATE TABLE stats_projection_outbox (
  event_id VARCHAR2(64) NOT NULL,
  event_schema VARCHAR2(64) NOT NULL,
  payload CLOB NOT NULL,
  status VARCHAR2(16) DEFAULT 'PENDING' NOT NULL,
  attempt_count INT DEFAULT 0 NOT NULL,
  next_attempt_at TIMESTAMP DEFAULT SYSDATE,
  published_at TIMESTAMP,
  applied_at TIMESTAMP,
  last_error VARCHAR2(2000),
  created_at TIMESTAMP DEFAULT SYSDATE NOT NULL,
  updated_at TIMESTAMP DEFAULT SYSDATE NOT NULL,
  CONSTRAINT pk_stats_projection_outbox PRIMARY KEY(event_id),
  CONSTRAINT ck_stats_projection_outbox_status
    CHECK(status IN ('PENDING','FAILED','PUBLISHED','APPLIED'))
);

CREATE INDEX idx_stats_projection_outbox_due
ON stats_projection_outbox(status,next_attempt_at,created_at);

CREATE TABLE stats_projection_applied_event (
  event_id VARCHAR2(64) NOT NULL,
  event_schema VARCHAR2(64) NOT NULL,
  applied_at TIMESTAMP DEFAULT SYSDATE NOT NULL,
  CONSTRAINT pk_stats_projection_applied PRIMARY KEY(event_id)
);

CREATE INDEX idx_stats_projection_applied_time
ON stats_projection_applied_event(applied_at);

COMMENT ON TABLE stats_projection_outbox IS
'事实批次统计 Outbox；Kafka 发布或消费失败时可持续恢复';
COMMENT ON COLUMN stats_projection_outbox.status IS
'PENDING/FAILED/PUBLISHED/APPLIED；只有 APPLIED 才允许到期清理';
COMMENT ON TABLE stats_projection_applied_event IS
'统计投影消费幂等标记；保留时间必须长于 STATS.PROJECTION Topic';

COMMIT;