87 lines
3.1 KiB
SQL
87 lines
3.1 KiB
SQL
-- =============================================================================
|
|
-- Vignette · migration 21 — learner-persona별 단일 활성 회기
|
|
-- =============================================================================
|
|
-- 기존 DB 적용 전 owner가 아래 읽기 전용 점검을 실행한다.
|
|
-- 중복 또는 실패 후 남은 invalid index가 있으면 임의 종료·DROP 하지 말고
|
|
-- 소유자가 보존·복구 방식을 결정해야 한다.
|
|
--
|
|
-- SELECT learner_id, persona_id, count(*)
|
|
-- FROM app.sessions
|
|
-- WHERE ended_at IS NULL AND persona_id IS NOT NULL
|
|
-- GROUP BY learner_id, persona_id
|
|
-- HAVING count(*) > 1;
|
|
--
|
|
-- CREATE INDEX CONCURRENTLY는 transaction block 안에서 실행할 수 없다.
|
|
-- release agent가 online migration으로 owner psql에 전달한다.
|
|
-- 이 파일의 전·후 condition은 IF NOT EXISTS가 invalid/wrong index를 조용히
|
|
-- 건너뛰는 경우를 fail-closed로 막는다.
|
|
|
|
DO $$
|
|
DECLARE
|
|
target_index oid := to_regclass('app.uq_sessions_one_active_learner_persona');
|
|
BEGIN
|
|
IF EXISTS (
|
|
SELECT 1
|
|
FROM app.sessions
|
|
WHERE ended_at IS NULL
|
|
AND persona_id IS NOT NULL
|
|
GROUP BY learner_id, persona_id
|
|
HAVING count(*) > 1
|
|
) THEN
|
|
RAISE EXCEPTION
|
|
'migration 21 blocked: duplicate active learner-persona sessions exist';
|
|
END IF;
|
|
|
|
IF target_index IS NOT NULL AND NOT EXISTS (
|
|
SELECT 1
|
|
FROM pg_index AS index_meta
|
|
WHERE index_meta.indexrelid = target_index
|
|
AND index_meta.indrelid = 'app.sessions'::regclass
|
|
AND index_meta.indisvalid
|
|
AND index_meta.indisready
|
|
AND index_meta.indisunique
|
|
AND index_meta.indnkeyatts = 2
|
|
AND pg_get_indexdef(index_meta.indexrelid, 1, true) = 'learner_id'
|
|
AND pg_get_indexdef(index_meta.indexrelid, 2, true) = 'persona_id'
|
|
AND regexp_replace(
|
|
pg_get_expr(index_meta.indpred, index_meta.indrelid),
|
|
'[[:space:]()]',
|
|
'',
|
|
'g'
|
|
) = 'ended_atISNULLANDpersona_idISNOTNULL'
|
|
) THEN
|
|
RAISE EXCEPTION
|
|
'migration 21 blocked: target index exists but is invalid or has a different definition';
|
|
END IF;
|
|
END
|
|
$$;
|
|
|
|
CREATE UNIQUE INDEX CONCURRENTLY IF NOT EXISTS uq_sessions_one_active_learner_persona
|
|
ON app.sessions (learner_id, persona_id)
|
|
WHERE ended_at IS NULL AND persona_id IS NOT NULL;
|
|
|
|
DO $$
|
|
BEGIN
|
|
IF NOT EXISTS (
|
|
SELECT 1
|
|
FROM pg_index AS index_meta
|
|
WHERE index_meta.indexrelid = 'app.uq_sessions_one_active_learner_persona'::regclass
|
|
AND index_meta.indrelid = 'app.sessions'::regclass
|
|
AND index_meta.indisvalid
|
|
AND index_meta.indisready
|
|
AND index_meta.indisunique
|
|
AND index_meta.indnkeyatts = 2
|
|
AND pg_get_indexdef(index_meta.indexrelid, 1, true) = 'learner_id'
|
|
AND pg_get_indexdef(index_meta.indexrelid, 2, true) = 'persona_id'
|
|
AND regexp_replace(
|
|
pg_get_expr(index_meta.indpred, index_meta.indrelid),
|
|
'[[:space:]()]',
|
|
'',
|
|
'g'
|
|
) = 'ended_atISNULLANDpersona_idISNOTNULL'
|
|
) THEN
|
|
RAISE EXCEPTION
|
|
'migration 21 failed: valid target unique index was not created';
|
|
END IF;
|
|
END
|
|
$$;
|