-- P1a: 1초 링버퍼 히스토리안 (hc900.history_1s)
-- 적용: psql "host=localhost dbname=iiot_platform user=postgres" -f scripts/sql/p1_historian.sql
-- 서비스(Hc900FastHistoryService)가 기동 시 동일 DDL을 멱등 적용하므로 수동 실행은 선택.
SET search_path TO hc900;

CREATE TABLE IF NOT EXISTS hc900.history_1s (
  tagname       text NOT NULL,
  recorded_at   timestamptz NOT NULL DEFAULT now(),
  value         text,
  controller_id text
);

-- 하이퍼테이블 (1시간 청크 — evict/압축 단위)
SELECT create_hypertable('hc900.history_1s', 'recorded_at',
                         chunk_time_interval => INTERVAL '1 hour', if_not_exists => TRUE);

-- 압축 (6시간 지난 청크) + 링버퍼 보존 (14일 — 청크 DROP, 비용≈0)
ALTER TABLE hc900.history_1s SET (timescaledb.compress, timescaledb.compress_segmentby = 'tagname');
SELECT add_compression_policy('hc900.history_1s', INTERVAL '6 hours', if_not_exists => TRUE);
SELECT add_retention_policy('hc900.history_1s', INTERVAL '14 days', if_not_exists => TRUE);

CREATE INDEX IF NOT EXISTS ix_h1s_tag ON hc900.history_1s (tagname, recorded_at DESC);

-- P1b: 연속집계 history_1min — 1초 버퍼 evict 전 60초 롤업(장기 무손실, 2계층)
CREATE MATERIALIZED VIEW IF NOT EXISTS hc900.history_1min
WITH (timescaledb.continuous) AS
SELECT time_bucket('1 minute', recorded_at) AS bucket, tagname,
       last(value, recorded_at) AS value, last(controller_id, recorded_at) AS controller_id
FROM hc900.history_1s GROUP BY bucket, tagname
WITH NO DATA;

-- 집계 lag(≤3h) ≪ 보존 윈도(14일) → raw 삭제 전 materialize 보장
SELECT add_continuous_aggregate_policy('hc900.history_1min',
  start_offset => INTERVAL '3 hours', end_offset => INTERVAL '10 minutes',
  schedule_interval => INTERVAL '5 minutes', if_not_exists => TRUE);

-- P1c: 메트릭엔진 드롭인 소스(bucket→recorded_at) + 온라인 KPI 누적 테이블
CREATE OR REPLACE VIEW hc900.history_1min_src AS
  SELECT tagname, bucket AS recorded_at, value, controller_id FROM hc900.history_1min;

CREATE TABLE IF NOT EXISTS hc900.live_kpi (
  column_id text NOT NULL, kpi text NOT NULL, window_start date NOT NULL,
  value double precision, unit text, state text, excluded_min int, status text,
  updated_at timestamptz NOT NULL DEFAULT now(),
  PRIMARY KEY (column_id, kpi, window_start));