38 lines
1.5 KiB
SQL
38 lines
1.5 KiB
SQL
-- 实体键唯一索引：单表发布模型下「一个实体一行」的结构性保证。
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--
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-- 为什么必须有：旧流程靠晋升时的实体键 upsert 把同一实体的多条草稿并成一行（自愈）。
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-- 单表之后没有 upsert 阶段，只剩入库时的「先查后插」；一次瞬时读失败或多实例并发，
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-- 就会留下两行，且两行都会通过审核进入公开视图 —— 前台出现重复内容。
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--
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-- 部分索引（WHERE is_deleted = 0）：与 RunwayEntityState / StreetSnapEntityState 的查询口径一致，
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-- 软删的旧实体键不再占用，允许同实体重新入库。
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-- 建索引前先体检：有重复则中止，避免索引创建失败留下半成品状态。
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DO $$
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DECLARE dup int;
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BEGIN
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SELECT count(*) INTO dup FROM (
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SELECT brand_id, season_code, collection_type
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FROM brand_runways WHERE is_deleted = 0
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GROUP BY 1, 2, 3 HAVING count(*) > 1
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) t;
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IF dup > 0 THEN
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RAISE EXCEPTION 'brand_runways 有 % 组重复实体键，请先人工合并再加唯一索引', dup;
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END IF;
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SELECT count(*) INTO dup FROM (
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SELECT city, year
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FROM street_snaps WHERE is_deleted = 0
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GROUP BY 1, 2 HAVING count(*) > 1
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) t;
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IF dup > 0 THEN
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RAISE EXCEPTION 'street_snaps 有 % 组重复实体键，请先人工合并再加唯一索引', dup;
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END IF;
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END $$;
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CREATE UNIQUE INDEX IF NOT EXISTS uq_br_entity
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ON brand_runways (brand_id, season_code, collection_type) WHERE is_deleted = 0;
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CREATE UNIQUE INDEX IF NOT EXISTS uq_ss_entity
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ON street_snaps (city, year) WHERE is_deleted = 0;
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